CA2232741A1 - Chemically-inducible arabidopsis pr-1 promoter - Google Patents

Abstract

The nucleic acid sequence of the full-length, chemically inducible Arabidopsis PR-1 promoter has been discovered and is disclosed herein. Furthermore, cisacting regulatory elements in the Arabidopsis PR-1 promoter involved in chemical induction have been characterized using deletion and linker-scanning mutagenesis and in vivo footprinting. It has been discovered that at least a portion of the region of promoter between positions -698 and -621 (relative to the transcription start site of the PR-1 gene) is required for induction of gene expression by chemicals. Two 10-bp linker-scanning mutations centered at 640-bp and 610-bp upstream from the transcription start site abolish the inducibility of the promoter while another 10-bp mutation centered at -670 bp results in average induced expression levels 4-fold higher than the unmutated promoter. Additionally, inducible in vivo footprints are located at positions 629 and -628 and at position -604 on the coding strand and at position -641 on the non-coding strand. The use of chemically inducible Arabidopsis PR-1 promoter fragments to regulate gene expression in plants in the presence of inducing chemicals such as SA, INA, and BTH is disclosed, as well as the use of these elements for the isolation of transcriptional regulatory proteins involved in the promoter regulation and for the construction of inducible hybrid promoters.

Description

- W O 98/03S36 PCTnJS97/12626 -CHEMICALLY-INDUCIBLE ARABIDOPSIS PR-1 P~OMOTER

This application claims the benefit of U.S. Provisional Application No. 60/027,228, filed July 23, 1996, the disclosure of which is hereby expressly incorporated by reference in its entirety into the instant disclosure.

FIELD OF THE INVENTION

The invention generally relates to non-coding DNA sequences that regulate the o transcription of associated DNA sequences in the presence of chemical regulators. The invention more particularly relates to the Arabidopsis PR- I promoter, as well as deletion and linker-scanning mutants thereof, and its use in regulating gene expression in plants in the presence of chemical regulators. The invention further relates to sequences in the PR-I
promoter that are necessary for induction by chemicals and that are involved in its inducibility s as well as their use for the isolation of transcriptional regulatory proteins and for the construction of inducible hybrid promoters.

BACKGROUND OF THE INVENTION

~o Advances in recombinant DNA technology coupled with advances in plant transformation and regeneration technology have made it possible to introduce new genetic material into plant cells, plants, or plant tissue. The target plants can range from trees and shrubs to ornamental flowers and field crops and even to cultures of plant tissue grown in bioreactors.
~5 Regardless of the target of genetic engineering of plants, a principal advantage to be realized is the controlled expression of chimeric genes so that they are expressed only at the ~p~u~liate time, to the appropriate extent, and in some situations in particular parts of the plant. For example, the energy expended by a plant to continuously produce high levels of a foreign protein could prove detrimental to the plant. whereas if the gene were expressed only when desired, the drain on energy and therefore yield could be reduced. Additionally, the phenotype expressed by the chimeric gene could result in adverse effects to the plant if expressed at inaL)~ L"iate times during development. For tissue in culture or in a bioreactor, CA 0223274l l998-03-l9 W 098/03536 PCTrUS97/1262 .
the untimely production of a desired secondary product could lead to a decrease in the growth rate of the culture, resulting in a decrease in the yield of the product.
In view of such considerations, it is apparent that control of the time, extent, and/or site of expression of chimeric genes in plants or plant tissues would be highly desirable. An ideal situation would be the at-will regulation of expression of an engineered trait via a regulating intermediate that could be easily applied to field crops, ornamental shrubs, bioreactors, etc.
Such gene control could be of particularly great commercial value.
Several plant genes are known to be induced by various internal and external factors including plant hormones, heat shock, chemicals, pathogens, lack of oxygen, and light. For u example, systemic acquired resistance (SAR) is a plant defense mechanism that occurs in diverse plant/pathogen interactions following a primary pathogen infection (Ryals, et al., Plant Cell 8, 1809-1819 ( 1996), incorporated by reference herein in its entirety). It often leads to a hypersensitive response associated with the formation of necrotic lesions and to a substantial increase of the endogenous salicylic acid (SA) level. As a result, the plant s becomes resistant to a variety of pathogens through a non-specific "immunization". This phenomenon is tighly correlated with the expression of several classes of genes, called pathogenesis-related ~PR) genes (Ward, et aL, Plant Cell 3, 108~-1094 ( 1991), incorporated by reference herein in its entirety). Interestingly, exogenous application of SA also induces SAR and expression of PR genes (Ward, et al. 1991; Uknes, et aL, Plant Cell 4, 645-656 (1992), incorporated by reference herein in its entirety) as well as of synthetic compounds, such as 2,6-dichloroisonicotinic acid (INA) (Vernooij, et al., MPMI 8, 228-234 ( 1995) incorporated by reference herein in its entirety) and benzo( I ,2,3)~hi~ 7ole-7-carbothioic acid S-methyl ester (BTH) (Friedrich, et aL, Plant J. 10(1), 61-70 ( 1996), incorporated by reference herein in its entirety; Lawton, et al., Plant J. 10, 71-82 (1996), incorporated by ~s reference herein in its entirety). Therefore, induction of PR protein genes by chemicals or pathogens provides a foundation to address the problem of controlling gene expression in plants and plant tissue.
Several steps in the signal transduction leading to the onset of SAR have been elucidated. Overexpression of a bacterial salicylate hydroxylase gene (nahG) has been shown to suppress SAR, indicating that SA accumulation is required for its onset (Gaffney, et al., Science 261, 754-756 (1993), incorporated by reference herein in its entirety). Recently, SAR
has been characterised in ~rabidopsis and the corresponding PR-1, PR-2 and PR-5 genes CA 0223274l l998-03-l9 W 098/03536 PCTnUS97/12626-have been isolated (Uknes. et al. 1992), thus facilitating the isolation of mutants with altered SAR. Mutants with constitutive SAR such as cprl (Bowling, et al., Plant Cell 6, 1845-1857 (1994)) have been described, as well as mutants defective in SAR such as nprl (Cao, etal.
1994) and nim I (Delaney, et al., Proc. Nat. Acad. Sci. 92, 6602-6606 (1995), incorporated by reference herein in its entirety). In the case of nim 1, a mutagenised population of Arabidopsis was screened for lack of PR- I gene expression after pathogen treatment (Delaney, et al.
1995). NIM I and NPR I were subsequently shown to include mutations in the same open reading frame (Cao, etal. 1997; Ryals, etal., Plant ~ell 9, 425-439 (1997), incorporated by reference herein in its entirety) that coded for a protein with extensive homology to the o transcriptional repressor I-K~3 (Ryals, et al. 1997).
Studies of the effects of chemical regulators on the promoters of several PR genes have also been described in the literature, shedding additional light of the SAR signal transduction pathway. Deletion analysis of the tobacco PR- 1 a promoter revealed that a 600-bp long promoter had lost its functional inducibility by pathogen infection as well by exogenous chemical application while 661-bp retained inducibility although to a lesser extent than a 903-bp long fragment (Uknes, et al., Mol. Plant-Microbe Interact. 6, 692-698 ( l 993), incorporated by reference herein in its entirety). Analysis of the tobacco PR-2d promoter revealed that some of its inducility is lost in a 607-bp long fragment but that 1047-bp were required for maximal induction, while a 321-bp long promoter had lost almost any~o inducibility (Hennig, et al. 1993). More recently, a Myb-like transcrition factor (myb 1) was isolated and its expression shown to be inducible by SA and tobacco mosaic virus (Yang, e al. 1996). Furthermore it was shown to bind in vitro to a fragment of the tobacco PR-la promoter (positions -679 to ~87 from the transcription start site) containing a Myb-like recognition site (positions -520 to -514). Moreover, a sequence in the tobacco PR-2d promoter (-348 to -324) was shown to bind in vitro to a yet unidentified protein. Mutation of this sequence reduced inducibility by SA by approximately 3-fold but not completely compared to wild-type sequence when included in a fragment spanning positions -364 to -288 in the PR-2d promoter and fused to the -90 35S CaMV promoter (Shah, et al. 1996).
United States Patent No. 5,614,395, incorporated by reference herein in its entirety, describes the Arabidopsis PR- I protein gene and its chemically inducible promoter. As described in this patent, the cDNA sequencc encoding this PR protein was cloned into plasmid pAPRlC-I, ATCC number 75049, deposited July 12, 1991. In addition, it was CA 02232741 1998-03-l9 W 098/03S36 PCT~US97/1262~

disclosed that the full-length promoter fragment (4.2 kb) from the PR- 1 coding sequence was isolated and cloned into plasmid pAtPRI-P, which was deposited January 5, 1994, with the Agricultural Research Culture Collection, International Depositing Authority and x~ignt d NRRL number NRRL B-2 1 169. It was further disclosed in this patent that the full-length Arabidopsis PR- I promoter fragment was fused to the firefly luciferase (LUC) gene and ultimately cloned into plasmid pAtPRI -S, which was in turn transforrned into Arabidopsis plants ~or chemical induction analysis. The transgenic Arabidopsis lines carrying the PR-1 promoter/LUC gene fusion were then treated by spraying with isonicotinic acid (INA). When analyzed, the transgenic lines showed significantly higher induction of luciferase activity compared to water-treated controls. Thus, INA was shown to induce expression in transformed plants of a chimeric gene comprising the full-length Arabidopsis PR- I promoter fragment.
As described in U.S. Patent No. 5,614,395, only a PR-l promoter/LUC gene fusion comprising the full-length (4.2 kb) PR-l promoter was analyzed. In addition, the nucleotide 15 sequence of the Arabidopsis PR-I promoter was not disclosed. E~owever, it is often the case that smaller DN~ fragments are easier to manipulate than larger ~NA fragments. In this instance, by reducing the PR- 1 promoter sequence to its minimal essential portion, creating a smaller DNA fragment, chimeric constructs comprising the minim~l promoter fragment joined to a coding sequence could in certain situations be more easily made and utilized than ~o constructs comprising a full-length promoter fragment.
Therefore, one object of the instant invention is to determine the nucleotide sequence of the chemically regulatable Arabiclopsis PR- I promoter. Based on this knowledge, additional objects of the instant invention are to deterrnine the minimal length of the Arabidopsis PR- I promoter required for chemical induction by using deletion mutagenesis and to characterize cis-acting regulatory elements in the Arabidopsis PR- 1 promoter involved in chemical induction by using linker-scanning mutagenesis and in-vivo footprinting.

SUMMARY OF THE ~NV~NTION

The present invention provides the nucleic acid sequence of the full-length Arabidopsis PR-I promoter. which is shown in SEQ ID NO: 1. In addition, the present invention encompasses chimeric genes comprising the Arabidopsis PR- I promoter -CA 02232741 1998-03-l9 W O 98/03536 PCTrUS97/12626-operatively linked to a coding sequence of a gene of interest, wherein the Arabidopsis PR-I
promoter regulates transcription of thé coding sequence in the presence of chemical regu~ators. In a preferred embodiment, the coding sequence encodes an assayable marker, such as an enzyme, whereby e~pression of the enzyme can be observed in assays for chemical induction of the chimeric gene. In related aspects. the present invention also embodies a recombinant vector~ such as a p]asmid. comprising the aforementioned chimeric gene, as well as a plant or plant tissue stably transformed with such a vector.
Another aspect of the present invention relates to the discovery that a certain region of the Arabidopsis PR-I promoter is required for chemical regu~ation. In particular, a region of o the Arabidopsis PR- I promoter between 698-bp and 621 -bp upstream from the transcription start site of the PR- 1 gene is necessary for induction of gene expression by chemicals such as salicylic acid (SA) compounds, isonicotinic acid (INA) compounds, and ben~o-1,2,3-thiadiazoles (BTH~. Inducibility of a 698-bp long promoter fragment is reduced by approximately 2-fold compared to longer promoter fragments and inducibility of promoter ~s fragments of 6? I-bp or shorter is lost altogether. Therefore, the present invention further embodies deletion mutants that are shorter than the full-length 4,258-bp Arabidopsis PR-I
promoter sequence. yet still yield similar induction of gene expression upon the application of a chemical regulator. These deletion mutants may be used to form chimeric genes, which in turn may be cloned into vectors and trans~ormed into plants in the same manner as the full-~o ]ength sequence.
A further aspect of the present invention relates to the discovery via linker-scanning mutagenesis that two 10-bp mutations centered at 640-bp and 610-bp upstream from the transcription start site (+ l 3 abolish the inducibility of the promoter while another 1 0-bp mutation centered at 670-bp upstream from the transcription start site results in induced -~5 expression levels 4-fold higher than the unm~ fe~ promoter. The 640-bp linker-scanning mutation encompasses a recognition site for transcription factors of the basic leucine zipper class, such as CREB, while the 610-bp linker-scanning mutation contains a se~uence similar to a recognition site for the transcription factor NF-k~. Furthermore, inducible in-vivo footprints are located at positions -629 and -628 and at position -604 on the coding strand and at position -641 on the non-coding strand. indicating that this region of the promoter undergoes changes in protein/DNA interactions upon chemical induction.

CA 0223274l l998-03-l9 WO 98/03536 PCT~US97/12626 The invention therefore describes important regulatory elements involved in the chemical induction of the PR-l promoter. These elements can he used for the isolation of transcriptional regulatory proteins involved in the promoter regulation and for the construction of inducible hybrid promoters. These elements can further be used as probes for s other chemically inducible promoters from Arahidopszs as well as chemically inducible promoters from other plants.

BRIEF DESCRIPTION OF T~E FIGURE

FIG. I depicts the structure of linker-scanning mutants LS I -LS 13. The wt sequence is taken from SEQ ID NO: 1. Nucleotides that are actually changed are shown in bold.

BRIEF DE~SCRIPTION OF THE SEQUENCES ~N THE SEQUENCE I_ISTING

s SEQ ID NO: I - Nucleic acid sequence of the full-length (4,258-~p long) Arahidopsis thaliana PR-I promoter (in plasmid pLl'DlD). Also shown are the nucleic acid sequence of the 5' untranslated region as well as the start of the coding region for the PR-I gene.
Nucleotides 3444 - 4258 constitute the 815-bp long Arabidopsis thaliana PR- I promoter fragment (în plasmid pLTD7D) that confers essentially the same levels of chemical induction ~o of gene expression as the full-length (4,258-bp long) promoter. Nucleotides 3561 - 4258 constitute the 698-bp iong Ara~oidopsis thaliana PR- I promoter fragment (in plasmid pLTD71 D) that also confers chemical induction of gene expression, although to levels reduced by approximately 3-4 fold as compared to the full-length promoter. Nucleotides 3638 - 4258 constitute the 621 -bp long Arabidopsis tlzaliana PR- I promoter fragment (in ~s plasmid pLTD72D) that confers no chemical induction of gene expression.
S~Q ID NO: 2 - primer extl .
SEQ ID NO: 3 - primer I a.
SEQ ID NO: 4 - primer I b.
SEQ ID NO: 5 - prirner lc.
SEQ ID NO: 6 - primer Id.
SEQ ID NO: 7 - primer NI,076.
~EQ ID NO: 8 - primer PRlR.

CA 0223274l l998-03-l9 W O 98/03536 PCTnUS97/1262 -SEQ ID NO: 9 - primer N781.
SEQ ID NO: 10 - primer N704 SEQ ID NO: 11 - primer LS 1-.
SEQ ID N0: 12 - primer LS I +.
s SEQIDNO: 13-primerLS2-.
SEQ ID NO: 14 - primer LS3-.
SEQ ID N0: 15 -primerLS4-.
SEQ ID NO: 16 - primer LS5-.
SEQ ID NO: 17 - primer LS6-.
o SEQ ID NO: 18 - primer LS7-.
SEQ ID NO: 19 - primer LS8-.
SEQ ID N0: 20 - primer LS9-.
SEQ ID NO: 21 - primer LS2+.
SEQ ID NO: 22 - primer LS3+.
SEQ ID NO: 23 - primer LS4+.
SEQ ID NO: 24 - primer LS5+.
SEQ ID N0: 25 - primer LS6+.
SEQ ID NO: 26 - primer LS7+.
SEQ ID NO: 27 - primer LS8+.
~o SEQ ID NO: 28 - primer LS9+.
SEQ ID NO: 29 - primer LS 10 SEQ ID NO: 30 - primer LS 11-SEQ ID NO: 31 - primer LS 12-.
SEQ ID NO: 32 - primer LS 102 SEQ ID NO: 33 - primer LS 103 SEQ ID NO: 34 - primer LS 112 SEQ ID NO: 35 - primer LS 113 SEQ ID NO: 36 - primer LS 122 SEQ ID NO: 37 - primer LS 123 SEQ ID N0: 38 - primer LS 13-.
SEQ ID NO: 39 - primer P I -SEQ ID NO: 40 - primer LMPCR2 W O 98/03536 PCT~US97/1262 SEQ ID NO: 41 - primer LMPCR3 SEQ ID NO: 42 - primer P2-SEQ ID NO: 43 - primer P3-SEQ ID NO: 44 - primer P41 +
SEQ ID NO: 45 - primer LMPCR1 SEQ ID NO: 46 - primer P52+
SEQ ID NO: 47 - primer P53+
SEQ ID NO: 48 - recognition site of the yeast transcription factor GCN4 SEQ ID NO: 49 - recognition site of the bZIP transcription factor CREB
o SEQ ID NO: 50 - recognition site for bZIP transcription factors SEQ ID NO: 51 - consensus recognition sequence of NF-kB

DETAILED DESCRIPTION OF TH~: INVENTION

15 The present invention encompasses various aspects of the Arabidopsis PR-I promoter, including the discovery that a particular region is required for its induction by chemicals. The full-length Arabidopsis thaliana PR- I promoter was originally isolated as a fragment having a length of 4,258-bp relative to the transcription start site of the PR-I gene. The nucleic acid sequence of the full-length promoter has been discovered and is shown in SEQ ID NO: 1.
~o rn addition, it has been discovered that at least a portion of the region of the Arabidopsis t~2aliana PR- 1 promoter located between 698-bp and 621-bp upstream from the transcription start site (between nucleotides 3561 and 3638 of SEQ ID NO: I ) is required for chemical induction of gene expression. The present invention therefore encompasses an isolated DNA molecule that constitutes the full-length PR- I promoter sequence, as well as ~5 isolated DNA molecules that constitute relatively minimal PR- I promoter sequences but still include the necessary region between nucleotides 3561 and 3638. These promoter sequences can be operatively linked to a coding sequence to form a chimeric gene, whereupon the promoter sequence will regulate transcription of the coding sequence. The chimeric gene can be cloned into a recombinant vector, which can then in turn be stably transformed into a host.
The transformed host will then exhibit expression of the chimeric gene upon treatment with a chemical regulator. Thus, the present invention also encomp~cses chimeric genes comprising either the full-length PR- I promoter or one of the chemically inducible PR- 1 promoter CA 02232741 1998-03-l9 W O 98/03536 PCT~US97/12626 fragments operative]y linked to a coding sequence; recombinant vectors comprising one of these chimeric genes; and host plants transformed with one these vectors.
The coding sequence forming a component of the chimeric gene comprises any transcribable DNA sequence such that the chimeric gene is capable of being expressed in a host under the proper conditions of chemical regulation. The coding sequence may be ~ derived from natural sources or be prepared synthetically. In one embodiment, the coding sequence may be transcribed as an RNA that is capable of regulating the expression of a phenotypic trait by an anti-sense mechanism. Alternatively, the coding sequence in the chimeric gene may be transcribed and translated, i.e. coded, in the plant tissue to produce a o polypeptide that imparts a phenotypic trait to the host. For example, a chimeric gene designed to be transforrned into a host plant could comprise a coding sequence that encodes one of the following: a gene controlling flowering or fruit ripening; a gene effecting tolerance or resistance to herbicides (i.e., a gene coding for wild-type or herbicide resistant acetohydroxyacid synthase (AHAS)) or to many types of pests, for example fungi, viruses, s bacteria, arachnids, nematodes, or insects (i.e., a gene coding for Bacillus thuringiensis endotoxin (BT)); a gene controlling production of enzymes or secondary metabolites; or a gene confering male or female sterility, dwarfness, flavor, nutritional qualities, or the like.
In a preferred embodiment, the coding sequence encodes an enzyme, such as an assayable marker, whereby expression of the enzyme can be observed in assays for chemical ~o induction of the chimeric gene. Suitable assayable markers that may be encoded by the coding sec~uence include, but are not limited to, the following: luciferase (LUC), chloramphenicol acetyltransferase (CAT), neomycin phosphotransferase (NPT), nopaline synthase (NOS), octopine synthase (OCS), and ,B-glucuronidase (GUS). An especially preferred marker is ~-glucuronidase (GVS). Chimeric genes comprising one of these assayable markers are particularly useful because the effect of the chemical induction, i.e.
beta-glucuronidase enzyme activity, is easily detectable in plant cells or extracts thereof.
Recombinant vectors, produced by standard techniques but comprising the chimericgenes described above, l~rese-lt an additional feature of the invention. Vectors are recombinant DNA sequences that may be used for isolation and multiplication purposes of ~o the mentioned DNA sequence and for the transformation of suitable hosts with these sequences. Preferred vectors for isolation and multiplication are plasmids that can be propagated in a suitable host microorganism, for example in E. coli. Preferred vectors for W O 98/03~36 PCT~US97/1262 transformation are those useful for transformation of plant cells or of Agrobacteria. For Agrobacteri~nt-mediated transformation, the preferred vector is a Ti-plasmid derived vector.
For direct DNA transfer into protoplasts, any of the aforementioned vectors may be used.
Various chemical regulators may be employed to induce expression of the coding s se~uence in the chimeric genes constructed according to the present invention. In the context of the instant disclosure, "chemical regulators" include chemicals known to be inducers for PR proteins in plants, or close derivatives thereof. These include benzoic acid, salicylic acid (SA), polyacrylic acid and substituted derivatives thereof; suitable substituents include lower alkyl, lower alkoxy, lower alkylthio, and halogen. An additional group of regulators for the o chemically inducible promoters sequences and chimeric genes of this invention is based on the benzo~ ,3-thi~di"7(-1e (BTH) structure and includes, but is not limited to, the following types of compounds: benzo- I ,2,3-rhi"c~ olecarboxylic acid, benzo- 1,2,3-~hi"~i"701ethjocarboxyljc acid, cyanobenzo-1,2,3-thiadiazole, benzo-1,2,3-thi"-li"~olecarboxylic acid amide, benzo-1,2,3-~hi~ ,701ecarboxylic acid hydrazide, benzo-1,2,3-thi~ 7O1e-7-carboxylic acid, benzo-1,2,3-thi~ 7~1e-7-thiocarboxylic acid, 7-cyano-benzo- I ,2,3-thiadiazole, benzo- I ,2,3-thi~ ole-7-carboxylic acid amide, benzo- 1,2,3-thi~qAi~701e-7-carboxyljc acid hydrazide, alkyl benzo-1,2,3-thi ,~ 7~1ecarboxylate in which the alkyl group contains one to six carbon atoms, methyl benzo- 1 ,2,3-thiadiazole-7-carboxylate, n-propyl benzo-1,2,3-thiadiazole-7-carboxylate, benzyl benzo-l~2~3-thi~ ole ~o 7-carboxylate, benzo-1,2,3-thiadiazole-7-carboxylic acid sec-butylhydrazide, and suitable derivatives thereof. Still another group of regulators for the chemically inducible DNA
sequences of this invention is based on the pyridine carboxylic acid structure, such as the isonicotinic acid structure and preferably the haloisonicotinic acid structure. Preferred are dichloroisonicotinic acids and derivatives thereof, for example the lower alkyl esters. Suitable "5 regulators of this class of compounds are, for example, 2,6-dichloroisonicotinic acid (INA), and the lower alkyl esters thereof, especially the methyl ester.
The chimeric genes constructed according to the present invention may be transforrned into any suitable host cell; however, the chimeric genes are preferably transformed into plant tissue. As used in conjunction with the present invention, the term 30 "plant tissue" includes, I~ut is not limited to, whole plants, plant cells, plant organs, plant seeds, protoplasts, callus, cell cultures, and any groups of plant cells organized into structural and~or functional units. Plants transforrned with the chimeric genes of the present invention W 098/03536 PCTnJS97/12626 _ may be monocots or dicots and include, but are not lirnited~ to, maize. wheat, barley, rye, sweet potato, bean, pea, chicory, iettuce, cabbage, cauliflower, broccoli, turnip, radish, spinach, asparagus, onion, garlic, pepper, celery, squash, pumpkin, zucchini, apple, pear, quince, melon, plum, cherry, peach, nectarine, apricot, strawberry, grape, raspberry, s blackberry, pineapple, avocado, papaya, mango, banana, soybean, tomato,sorghurn, sugarcane, sugarbeet, sunflower, rapeseed, clover, tobacco. carrot, cotton, alfalfa, rice, potato, eggplant. cucumber, and Arabidopsis.
The chimeric genes of the instant invention and vectors containing these genes can be introduced into plant cells ~y a variety of techniques that give rise to transformed cells, tissue, o and plants or to cell cultures useful in bioreactors. Several techniques are described in detail in the examples that follow. Other methods included here for enabling purposes, which are directed to both monocots and dicots, are disclosed in U.S. Patent No. 5,614,395. Such methods used for transfer of DNA into plant cells include, for example, the direct infection of or co-cultivation of plants, plant tissue, or cells with Agrobacterium tumefaciens (Horsch, R. et al., Science 225: 1229 ( 1985); Marton, L., Cell Culture and Somatic Cell Genetics of Plants 1: 514-521, 1984). Additional methods include direct DNA uptake, liposomes, electroporation, micro-injection, and microproJectiles. Such methods have been published in the art. See, for example, Bilang, et al., Gene 100: 247-250 ( 1991 ); Scheid et al., Mol. Gen.
Genet. 228: 104-1 12 ( 1991 ); Guerche et al., Plant Science 52: 1 1 1-1 16 ( 1987); Neuhause et ~o al., Theor. Appl. Genet. 75: 30-36 (1987); Klein et al., Nature 327: 70-73 ( 1987); Howell et al., Science 208: 1265 ~1980); Horsch etal., Science 227: 1229-1231 (1985); DeBlock etal., Plant PhYsiology 91: 694-701 ( 1989); Met~20ds for Plant Molecular Biology (Weissbach and Weissbach, eds.) Academic Press Inc. ( 1988); and Methods i~. Plant Molec~lar Biology (Schuler and Zielinski, eds.) Ac~demic Press Inc. ( 1989). See also, U.S. Patent Nos.
4,945,050; 5,036,006; and 5,100,792, all to Sanford et al. In addition, see U.S. Patent Application Serial Nos. 08/438,666, filed May 10, 1995, and 07/951,715, filed Sept. 25, 1992, both of which are herel~y incorporated by reference in their entireties.
Practical applications of this invention include the controlled expression of chimeric genes in crop plants so that they are expressed only at the apL)I~pliate time, to the ayyl~.y~iate extent, and/or in particular parts of the plant. For example, the effectiveness of disease resistance or insect resistance in transgenic plants transformed with genes encoding disease-resistant or insect-resistant proteins, respectively, could be enhanced if the timing of the W O 98/03S36 PCT~US97112626 expression could be controlled. See, e.g., Uknes, Pla~zt Cell, 4: 645-656 (1992); Ward etaL, Plant Cell3:1085-1094 (1991); Gould, ~iosczence 38: 26-33 (1988); and Gould, TIB7ECH
6: S15-S18 (1988). Also, the chemical regulation of developmental processes such as homeosis, germination, tillering, sprouting, flowering, anthesis, fruit ripening, and abscission offers several advantages s~ch as the facilitated production of hybrid seed, greater reduction of crop loss, and more generally, control of the growth and development of the plant by the farmer Thus, the present invention applies equally to transgenic plants containing heterologous genes, e.g., disease resistance genes including PR and SAR genes, insect resistance genes such as BT genes, and genes involved in developmental processes such as o those described above. It also includes genes encoding industrial or pharmaceutical biomaterials such as plastics and precursors thereof, perfumes, additives, enzymes and other proteins. and pharmaceuticals, wherein the plant effectively would be used as a bioreactor, e.g., the two genes encoding production of polyhydroxybutyrate, a thermoplastic (Poirier et al., Science 256: 520-523 (1992).
s As described more fully below in the examples, the full-length PR-1 promoter sequence was fused to the ,13-glucuronidase (GUS) gene at the native ATG to obtain a chimeric gene cloned into plasmid pLTDlD. Plasmid pLTDlD was then digested with restriction enzymes to release a fragment comprising the full-length PR- I promoter sequence and the GUS gene, which was then used to construct the binary vector designated ~o pCIB/LTDlD. This binary vector was transformed into Agro~acterium tumef~lciens, which was in turn used to transform Arabidopsis plants.
Plasmid pLTDI D was also used to form a series of S' end deletion mutants havingincreasingly shorter PR-I promoter fragments fused to the GUS gene at the native ATC~.
Various restriction enzymes were used to digest plasmid pLTDlD to obtain the binary vectors with different lengths of promoter fragments. In particular, pLTD5D was constructed with a 1,974-bp long promoter fragment; pLTD6D was constructed with a 1,293-bp long promoter fragment; pLTD61D was constructed with a 984-bp long promoter fragment; pLTD7D was constructed with a 81 S-bp long promoter fragment; pLTD71 D was constructed with a 698-bp long promoter fragment; pLTD72D was constructed with a 621 -bp long promoter fr~gme~t 30 pLTD8D was constructed with a 572-bp long promoter fragment; and pLTD9D was constructed with a 78-bp long promoter fragment. Like the binary vector comprising the full-W O 98/03536 PCT~US97J12626 -length PR-I promoter fragment, these 5' end deletion mutants were also transforrned into Agrobacteriunz tllmefaciens and, in turn, Arabidopsis plants.
Each of the transgenic Arabidopsis lines was treated by spraying with isonicotinic acid (INA), a known inducer of the PR- 1 promoter. Green tissue was harvested three days after treatment and subjected to a GUS enzyme assay to determine the amount of protein expressed as a result of induction of each chimeric gene. For each transgenic line, the induction of GUS
expression by INA was obtained by dividing the specific activity of the INA-treated sample by the specific activity of an untreated control sample.
As expected, upon treatment with INA, plants transformed with the chimeric gene o including the full-length (4,258-bp long) PR- I promoter demonstrated greatly increased induction of GUS expression compared to controls. In addition, the 1,974-bp, 1,293-bp, 984-bp, and 815-bp long promoter fragments yielded similar induction of GUS expression by INA. The 698-bp long promoter fragment still yielded high inducibility by INA, although reduced by approximately 3~ fold compared to the longer promoter fragments. However, the s 621-bp, 572-bp, and 78-bp long promoter fragments yielded substantially no induction of GUS expression by INA. These results are shown in Table 1, which presents the average values of GUS activity in pmole MU/mg protein/min (INA-treated~untreated controls) for the transgenic lines containing the PR- I promoter constructs.
The presence of the correct hybrid construct in the transgenic lines was confirmed by ~n PCR amplification. INA induction of the endogenous PR- I gene was confirmed by Northern blot analysis for transgenic lines containing the l ,293-bp, 689-bp, 621 -bp, 574-bp and 78-bp long constructs (S lines per construct) indicating that the loss of inducibility of GUS
expression was due to the gene construct and not to lack of SAR-mediated induction of gene expression in these particular lines or samples.
~s Thus, at least a portion of the region of the Arabidopsis t~zaliana PR-I promoter located between positions 3561 and 3638 of SEQ ID NO: I (between 698-bp and 621-bp upstream from the transcription start site) is required for chemical induction of gene expression. Its removal completely abolishes PR-I promoter induction. Moreover, additional elements located between positions -815 and -698 also contribute to full inducibility of the ~o promoter. Minimal PR-I promoter fragments having lengths substantially less than the full-length PR-I promoter can therefore be operatively linked to coding sequences to form smaller constructs than can be formed using the full-length PR-I promoter. As noted earlier, shorter CA 02232741 l99X-03-19 WO 98103536 ~CT~US97/12626 -DNA fragments are often more amenable to manipulation than longer fragments. Thechimeric gene constructs thus formed can then be transformed into hosts such as crop plants to enablc at-will regulation of coding sequences in the hosts.
While a deletion analysis characterizes regions in a promoter that are required overall for its regulation, linker-sc~nn;ng mutagenesis allows for the identification of short defined motifs whose mutation alters the promoter activity. Accordingly, a set of 13 linker-scanning mutant promoters fused to the coding sequence of the GUS reporter gene (~S I to LS 13, Figure I ) was constructed. Each of them contained a l~)-bp mutation (8-bp for LS 12) located between positions -705 and -578 (nucleotides 3554 to 36~ 1 of SEQ ID NO: I ) and included in a 1,293-bp long promoter fragment (nucleotides 2g66 to 4258 of SEQ ID NO: 1). Each construct was transformed into Arabidopsis and GUS activity was assayed for 19 to 30 independent transgenic lines. The presence of the correct hybrid construct in transgenic lines was confirmed by PCR amplification of all lines containing LS7 and LS 10 constructs and by random sampling of lines cont~ining the other constructs. Amplified fragments were digested with XbaI and separated on high resolution agarose gels to distinguish between the different LS constructs. The effect of each mutation on promoter activity was compared to an equivalent number of transgenic lines containing the ~lnmut~t~cl 1,293-bp construct. Two repetitions resulting from independent plating of seeds and INA-tr~-~tm~-n~c were carried out in every case.
Most LS mutations had no effect or minor effects on the promoter activity. However, 3 of them had dramatic effects on the promoter function. One construct, LS4 (introducing a mutation at positions -666 to -675 (nucleotides 3584 to 3593 of SEQ ID NO: 1)), resulted in 2-fold higher average induction of GUS activity by INA than the control construct and approximatively 4-fold and 3-fold higher average GUS activity for INA- and water-treated '5 samples, respectively (Table 2). This suggested that a negative regulatory element had been m1lt~tefl in this construct or, less likely, that a sequence responsible for higher promoter activity had been introduced. Since both induced and uninduced expression levels were influenced, the mutation seemed to affect a constitutive negative regulatory element.
Interestingly, LS5 which contained a mutation adjacent to the mutation in LS4, also led to 3-fold higher average levels of GUS activity after water treatment but INA-induced levels of activity for LS5 were similar to the control construct. This suggested that such a regulatory element may span the sequences affected by both mutations.

W O 98/03536 PCT~US97/12626 In two constructs, LS7 (mutation at positions -636 t-o -645 (nucleotides 3614 to 3623 of SEQ ID NO: I )) and LS 10 (mutation at positions -606 to -615 (nucleotides 3644 to 3653 of SEQ ID NO: 1)), a complete loss of inducibility of GUS activity by INA was observed.
Average GUS values for both water and INA treatments in transgenic lines cont~ining LS7 s were similar to water-treated values for lines containing the control construct. In the case of ~ LS 10, average GUS values were slightly higher because of two lines showing high uninduced and induced GUS activity. These results are consistent with the presence of a positive regulatory element that is necessary for induction of PR- 1 gene expression by INA in or near the LS7 and LS 10 locations.
INA-induction of the endogenous PR- I gene was monitored by Northern blot analysis for transgenic lines containing LS I, LS4, LS7 and ~S 10 (5 lines per construct) and did not significantly differ from lines containing the control construct. indicating that the loss of inducibility of GUS expresion was due to the gene construct and not to lack of or higher SAR-mediated induction of gene expression in these particular lines or samples.
l5 ' The sequences mutated in the linker-scanning constructs, in particular those that showed marked differences from the control construct, were examined more closely. For LS4, a perfect homology was found to the recognition site of the yeast transcription factor GCN4 ("TGACTG" (SEQ ID NO: 48~), a member of the basic leucine zipper (bZIP) family.
The sequence mutated in LS5 contained a perfect homology to the recognition site of CREB
~o ("CTACGTCA" (SEQ ID NO: 49)), a member of the bZIP transcription factor family as well.
Mutations in LS7 and LS 10 that had the most dramatic effects on the promoter activity also contained interesting sequences. A recognition site for bZIP transciption factors ("ACGTCA" (SEQ ID NO: 50)) was found in LS7 and a sequence similar to the binding site of transcription factors of the Rel family, such as NF-kB, was found in LS 10 75 ("GGACTTTTC" compared to the consensus recognition sequence "GGGACTTTTCC" ~SEQ
ID NO: 51~. No significant homology to binding sites of known transcription factors could be found in the sequences mutated in the remaining linker-scanning constructs.
SA is an exogenous signal for gene expression that can also be applied exogenously.
Although all data suggest that INA and SA act on plant analogously, experiments were conducted to determine whether the effects of the two compounds on the linker-scanning promoters were identical. For each linker-sc~nning construct, five lines showing medium to strong inducibility by INA were treated in parallel with water. 0.325mM INA, and 5mM SA.

WO 981~3536 PCTAUS97112626 The responses of the different constructs to SA and INA were similar when norm~li7ed to the effect of each compound on the control construct. This observation supports the commonly held assumption that INA and SA act through the same pathway for induction of expression of PR-genes. Induction of LS4 by SA was approximately 2-fold higher than induction of the control construct by SA, as observed before with INA. For the five lines Cont~ining LS7, an average 1.5-fold induction by SA was measured compared to 1.4-fold by INA (in each case as an averagc of two independent repetitions). Interestingly, an average 4.0-fold induction by SA was measured for l S 10 compared to I .6-fold by INA. This suggests that the effect of the mutation in I,S 7 0 was less dramatic than in LS7 and that this difference could only be o detected under stronger inductive conditions such as the treatment with SA.
Organ-specific GUS expression was examined in roots and floral tissues of three independent untreated 3ines per linker-scanning construct. In the control construct, some weak GUS expression was detected in male organs but no expression could reproducibly be detected in other flowers parts or roots. In the linker-sc~nning constructs a similar pattern of GUS exprcssion was observed indicating that the mutations did not dr~3m:ltic:~lly affect organ-specific expression of the PR-I promoter. However, for some constructs, the intensity of GUS expression in the male floral organs differed frorn the control construct. In the three lines containing LS4 and LSS, expression was higher whereas in the three lines containing LS7 and LS 10, almost no GUS activity was detected. Therefore, the mutations appear to ~o have similar up and down regulating effects on the promoter activity in llninducecl male floral organs as well as in uninduced green tissue.
In-vivo footprinting is based on methylation of guanine bases at position N7 by dimethylsulfate (DMS) followed by specific cleavage of the methylated guanines by piperidine. Changes in DNA occupancy by DNA-binding proteins alter the accessibility of 75 DNA by the methylating agent, thereby yielding changes in populations of cleaved molecules after piperidine treatment. After LM-PCR a "G" ladder is resolved on a sequencing gel and differences in intensities of specific bands can be related to differences in DNA protection at the particular guanines.
Analysis of the coding strand revealed inducible footprints at positions -629 and -628 30 and at position -604 (FIG.I) (nucleotides 3630, 3631, and 3655 of SEQ ID NO: 1, respectively). At both sites, an increased band intensity after INA treatment was detected, indicatlng deprotection of these guanines upon INA treatment These two footprints are CA 02232741 1998-03-l9 W O98!03536 PCTAUS97/12626-located in sequences mutated by linker-scanning constructs LS8 and LS11 (F~G. 1). Neither construct seemed to significantly influence the regulation of the promoter, but they are surrounding the sequence mutated in construct LS10, which had lost inducibility by INA.
This suggests that that the region of the PR-I promoter around this site undergoes changes in its occupancy by DNA-binding proteins. No other change in band intensities could be detected in the range of DMS concentrations tested (0.04% to 1%), suggesting that the described sites are the only ones affected after INA treatment.
Examination of the non-coding strand revealed an inducible footprint at position -641 ~3618 of SEQ ID NO: 1). In this case, too, deprotection was observed. The guanine at o position -641 is included in the sequence mutated in linker-sc~nning mutant LS7, which had lost inducibility by INA and that contains a recognition sitc for basic leucine zipper transcription factors a~ positions -645 to -640. Different DMS concentrations did not reveal any other inducible footprint.
These results show that the e~c~minc~l region undergoes changes in protein-DNA
interactions and suggest that the above described elements are required for the induction itself ("switch" element) and are not just binding sites for constitutive transcriptional activators.

CA 02232741 1998-03-l9 W098/03536 PCTrUS97/12626-EX~MPLES

The invention will be further described by reference to the following detailed examples.
These examples are provided for purposes of illustration only, and are not intended to be limiting unless otherwise specified. Standard recombinant DNA and molecular cloning techniques used here are well known in the art and are described by T. Maniatis, E. F. ~ritsch and J. Sambrook, Molecular Clonin~e: A Laboratorv manual. Cold Spring Harbor laboratory, Cold Spring Harbor, NY (1989) and by T3. Silhavy, M.L. Berrnan, and T .W. Enquist, ExPeriments with Gene Fusions, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY
o (1984) and by Ausubel, F.M. etal., Current Protocols in MolecularBiolo~Y. pub. by Greene Publishing Assoc. and Wiley-~nterscience (1987).

A. Full-Length Arabid~opsis PR- 1 Promoter Example 1: Deterrnination of the Transcription Start Site of the Arabidopsis PR- I gene RNA was purified from frozen tissue by phenol/chloroform extraction followed by lithium chloride precipitation (Lagrimini et al. ~1987), Proc. Natl. Acad. Sci. USA 84: 7542-7546). A PR-I specific right-to-left "botto~ dlldl~ oligonucleotide corresponding to ~o positions +59 to +32 downstream from the PR- I ATG (ext 1: AAG AGC ACC TAC AAG
AGC TAC AAA GAC G) (SEQ ID NO: 2) was labelled at its 5' end (Sambrook J. et al.( 1989), Cold Spring Harbor Laboratory Press. Cold Spring Harbor, New York~ and served as primer for the extension reaction carried out with AMV reverse transcriptase according to the manufacturer's recommendations (Promega, Madison, WI). ~he extension product wasseparated on a 6% polyacryamide gel and its length was deterrnined by comparison with a sequence ladder obtained with pAtPRI-R (U.S. Patent No. 5,614,395) as a template and oligonucleotide ext I as a primer using the Sequenase Version 2.0 DNA sequencing kit according to the manufacturer's conditions (USB, Cleveland, OH).

W O 98/03~36 PCT~US97/12626' -Example 2: Fusion of the Arabidopsis Full-Length PR- l Promoter to the Coding Sequence of the ,B-glucuronidase (GUS) Gene Plasmid pAtPRI-~ was used as a template in PCR with a left-to-right "topstrand"
s primer extending from positions -268 to -251 upstream of the PR-I ATG (primer l a: GGC
~AA GCT ACC GAT AC) (SEQ ID NO: 3) and a right-to-left "bottomstrand" primer comprising ] I bp of GUS coding sequence extending up to the GUS ATG and a further 9 bp of PR- l sequence extending from the ATG into the PR- I untrans3ated leader (primer I b:
GGA CGT AAC ATT TTT CTA AG) (SEQ ID NO: 4). This PCR reaction was undertaken o with AmpliTaq DNA polymerase according to the manufacturer's recommendations (Perkin Elmer/Roche, Branchburg, NJ) for five cycles at 94~C (30 s)~ 40~C (60 s), and 72~C (30 s) followed by 25 cycles at 94~C (30 s), 55~C (60 s) and 72~C (30 s). This generated a product of 278 bp through annealing of the homologous PR- I sequences; the fragment included a BglII site at its left end from the PR-I promoter. A second PCR reaction was done s using plasmid pBS-GUS 1.2 (Uknes et al., The Plant Cell 5:159-169 ( 1993)) as a template and using a left-to-right "topstrand" oligonucleotide, which comprised 9 bp of PR- 1 untranslated leader up to the PR- I ATG and a further I I bp of GUS sequence from the ATG into the GUS
coding sequence (primer lc: CTl' AGA AAA ATG TTA CGT CC) (SEQ ID NO: 5) and a right-to-left "bottom strand" oligonucleotide extending from positions -502 to -518 upstream ~o of the PR-l ATG into the GUS coding sequence (primer Id: TTA CGC TGC GAT GGA TC) (SEQ ID NO: 6). This PCR reaction was done under the same conditions as the one described above and generated a fragment of 527 bp through annealing of the homologous GUS sequences; this fragment included a SnaBI site at its right end derived from the amplified GUS sequence.
~5 The two PCR fragments generated above were gel purified using standard procedures to remove oligonucleotides and were then themselves mixed in a further PCR reaction ("inside-outside PCR") with primers la and ld. Conditions for this reaction were the same as described above. The amplified fragment was a fusion of the PR- 1 promoter fragment from the first PCR reaction described above and the GUS 5' coding sequence from the second PCR
:~o reaction described above and had a BglII site at its left end and a SnaBI site at its right end.
The fragment was gel purified and cleaved with BglII and SnaBI (all restriction enzymes were purchased from Promega, Madison, WI) to yield a product of 497 bp in size that was ligated ~ 19 CA 02232741 l99X-03-19 W098/03536 PCTrUS97/12626-.
in a three-way ligation with a BglII-SacI fragment of pAtPRl-R containing PR-l promoter sequences upstream from the BglII site and a SnaBI-SacI fragment of pBSGUS l .2 con~ining the 3' end of GUS to obtain pLTDlD.

B. Deletion MutantAnalysis Example 3: Preparation of Chimeric Genes Containing Variable Lengths of the PR- 1 Promoter Secluence Fused to GUS

o A. Construction of pLTD5D
Plasmid pLTr) I D was digested with restriction enzymes XhoI and ~paI; the protruding ends of the X~zoI site were filled-in with Klenow DNA polymerase (Promega, Madison, WI); and the resulting blunt-ended vector fragment containing a 1,974-bp long promoter fragment was self-ligated.
~5 B. Construction of pLTD6D
Plasmid pLTD l D was digested with restriction enzymes XhoI and SnaBI; the protruding ends of the Xl201 site were filled-in with Klenow DNA polymerase; and the vector fragment containing a 1,293-bp long promoter fragment was self-ligated.
C Construction of pLTD6 I D
Plasmid pLTDlD was used as template for PCR with a left-to-right "topstrand"
primer comprising a XhoI restriction site and extending from position -1,019 to -1,000 upstream of the PR-l ATG (primer Nl,076: ACC GCT CGA GAA TTT TTC TGA TTC
GGA GGG) (SEQ ID N0: 7) and a right-to-left "bottomstrand" primer extending fromposition -584 to -607 upstream of the PR- I ATG ~primer PR l R: TAT TTG TTT CTT AGT
GTT TCA TGC) (SEQ ID N0: 8). The PCR reaction was undertaken for 3 cycles at 94~C
(30 s), 50~C (30 s), and 72~C (30 s) followed by 30 cycles at 94~C (30 s), 55~C (30 s) and 72~C (30 s). This generated a 4 ~ 2-bp long fragment containing a ~hoI site at its right end and a NdeI site at its left end. The fragment was gel purified, digested with ~toI and NdeI, and ligated between the XhoI and NdeI sites of pLTD l D, resulting in a 984-bp long PR- I
promoter fragment fused to GUS.

CA 0223274l l998-03-l9 W 0 98/03536 PCTrUS97/12626-D. Construction of pLTD7D
Plasmid pL l DlD was digested with restriction enzymes XhoI and BstEII; the protruding ends of both XhoI and BstEII sites were filled-in with Klenow DNA polymerase;
and the vector fragment containing a 8 ~ 5-bp long promoter fragment was self-ligated.
E. Construction of pLTD71D
Plasmid pLTD lD was used as template for PCR with a left-to-right "topstrand"
primer comprising a XhoI restriction site and extending from position -733 to -714 upstream of the Pl~- I ATG (primer N781: ACC GCT CGA GAT AAA TCT CAA TGG GTG ATC) (SEQ ID NO: g) and a right-to-left "bottomstrand" primer extending from position -584 to -o 607 upstream of the PR-l ATG (primer PRIR: TAT TTG TTT CTT AGT GTT TC~ TGC~
(S~Q ID NO: 8). The PCR reaction was undertaken for 3 cycles at 94~C (30 s), 50~C (30 s), and 72~C (30 s) followed by 30 cycles at 94~C (30 s~, 55~C (30 s) and 72~C (30 s). This generated a 126-bp ~ong fragment containing a Xhoi site at its right end and a NdeI site at its ]eft end. The fragment was gel purified, digested with XhoI and NdeI, and ligated between the XhoI and NdeI sites of pLTD1 D, resulting in a 698-bp long PR- 1 promoter fragment fused to GUS.
F. Construction of pLTD72D
Plasmid pLTDlD was used as template for PCR with a left-to-right "topstrand"
primer comprising a XhoI restriction site and extending from position -656 to -637 upstream 20 of the PR- l ATG (primer N704: ACC GCT CGA GTT CTT CAG GAC TTT TCA GCC) (SEQ ID NO: 10) and a right-to-left "bottomstrand" primer extending from position -584 to -607 upstream of the PR- I ATG (primer PR1 R: TAT TTG TTT CTT AGT GTT TCA TGC) (SEQ ID NO: 8). The PCR reaction was undertaken for 3 cycles at 94~C (30 s), 50~C (30 s), and 72~C (30 s) followed by 30 cycles at 94~C (30 s), 55~C (30 s) and 72~C (30 s). This ~5 generated a 49 bp long fragment containing a Xhol site at its right end and a NdeI site at its left end. The fragment was gel purified, digested with XhoI and NdeI, and ligated between the XhoI and NdeI sites of pLTD I D, resulting in a 621 -bp long PR- 1 promoter fragment fused to GUS.
G. Construction of pLTD8D
Plasmid pLTDlD was digested with restriction enzymes XhoI and NdeI; the protruding ends of both XhoI and NdeI sites were filled-in with Klenow DNA Polymerase;
and the vector fragment containing a 572-bp longpromoter fragment was self-ligated.

CA 02232741 1998-03-l9 W 098/03536 PCT~US97/12626-H. Construction of pLTD~D
Plasmid pLTD 1 D was digested with restriction enzymes XhoI and BglII; the protruding ends of both XhoI and BglII sites were filled-in with Klenow ~NA Polymerase;
and the vector fragment containing a 78-bp long promoter fragment was self-ligated.

Example 4: Plant Transformation A. Construction of Binary Vectors Plasmid pLTD I D was digested with restriction enzymes X~zoI and SacI releasing a o 6,422-bp long fragment that was gel purified and inserted between the SalI and SacI sites of pCIB200 (U.S. Patent No. 5,614,395), resulting in pCIBl~TDlD. Plasmids pLTDSD, pLTD6D, pLTD61 D, pl TD7D, pLTD71 D, pLT72D, pLTD8D, and pLTD9D were digested with restriction enzymes Kpnl and SacI. The resulting PR- I promoter-GUS gene fusions (4,138-bp, 3,457-bp, 3,148-bp, 2,979-bp, 2,862-bp, 2,785-bp, 2,736-bp and 2,242-bp long 15 fragments, respectively) were gel purified and inserted between the KpnI and SacI sites of pCIB200, resulting in plasmids pCIB/LTD5D, pCIB/LTD6D, pCIB/LTD61D, pCIB/LTD7D, pCIB/LTD71D, pCIB/LTD72D, pCIB/LTD8D, and pCIB/LT~9D, respectively.
B. Transformation of Arabidopsis The binary vector constructs were transformed into Agrobacteri~m tumefacie~s strain ~o GV3101 (Bechtold, N. etal., CR Acad. Sci. Paris, Sciences de la vie, 316:1194-1199 (1993)) by electroporation (Dower, W.J., Mol. Biol. Rep I :5 (1987)). Arabidopsis was transformed using the vacuum infiltration method (Bechtold, N. et al., CR Acad. Sci. Paris, Sciences de la vie, 316: 1194- 1199 (1993)). Seeds obtained from infiltrated plants (T I seeds) were plated on 50mg/1 of kanamycin sulfate and resistant Tl plants were transfered to soil.
C. Transforrnation of Maize The binary vector constructs are transformed into maize using the method described by Koziel et al., Biotechnology I 1: 194-200, (1993) using particle bombardment into cells of imm~tllre embryos.
D. Transformation of Wheat The binary vector constructs are transformed into imm~tl-re wheat embryos and imm~tllre embryo-derived callus using particle bombardment as described by Vasil et al., CA 02232741 1998-03-l9 W O 98/03536 _ PCTnJS97/12626--B iotechnology I 1: 1553- ~ 558 (1993), and Weelcs et a~., Plant Physiology 102: 1077- 1084 1993).

Example 5: Determination of the Inducibility of Gene Expression by Chemical Regulators A. Treatment with INA
For each transgenic line, seeds obtained from Tl plants were harvested (T2 seeds) and plated on duplicate plates containing 50 mg/l of kanamycin sulfate. After twenty days, one plate was treated by spraying with 0.25 mg/ml INA while the duplicate was kept as a control.
lO Three days later, green tissue was harvested, flash frozen, and kept at -70"C .
B. GUS Enzyme Assay Frozen tissue was homogenised to a fine powder under liquid nitrogen. Extracts were prepared in GUS assay buffer (50 mM sodium phosphate pH 7.0, 0.1% Triton-X 100, 0.~%
sarkosyl, 10 mM beta-mercaptoethanol) as described by Jefferson, R.A. et al., Proc. Natl.
Is Acad. Sci. USA 83, 8447-8451 (1986). The reactions were carriedout in the wells of microtiter plates by mixing 10 ~1 of extract with 65 ,ul of GUS assay buffer containing 4-methyl umbelliferyl glucuronide (MUG) at a final concentration of 2 mM in a total volume of 75 ,ul. The plates were incubated at 37~C for 30 minutes and the reaction was stopped by the addition of 225 ,~LI of 0.2 M sodium carbonate. The concentration of fluorescent indicator ~o released was deterrnined by reading the plates on a Flow Labs Fluoroskan II ELISA plate reader. Duplicate fluorescence values for each samples were averaged, and background fluorescence (reaction without MUG) was substracted to obtain the concentration of MU for each sample. The amount of protein in each extract was determined in a Bradford assay (Bio-Rad laboratories, Hercules, CA) according to the manufacturer's instructions. The specific activity was determined for each sample and was expressed in pmoles MU/mg protein/minute.
Table I shows the average values of GUS activity (INA-treated/untreated controls) for the transgenic lines containing the PR-I promoter constructs. Here, GUS values are expressed in pmole MU/mg protein/min, and the number of independent transgenic lines used for the determination of each value are shown in column (N). For each independent transgenic line, the induction of GUS expression by INA was obtained by dividing the CA 0223274l l998-03-l9 W O 98/03536 PCTrUS97/12626-specific activity of the INA-treated sample by the specific activity of the untreated control sample.
Table I
Promoter Control INA-Treated Fold Induction N
4,258-bp 183 1,076 35 18 1,974-bp 113 1,019 18 22 1,293-bp 106 955 10 21 984-bp 36 398 13 14 815-bp 99 1,064 19 20 698-bp 78 314 5 19 621 -bp 57 52 0.9 19 572-bp 165 183 1. I 19 78-bp 143 137 1.2 19 As shown in Table 1, upon treatment with INA, plants transformed with the chimeric gene including the full-length (4,258-bp long) PR-I promoter demonstrated greatly increased induction of GUS expression compared to controls. In addition, the 1,974-bp, 1,293-bp, 984-bp, and 815-bp long promoter fragments yielded similar induction of GUS expression by INA. The 698-bp long promoter fragment still yielded high inducibility by INA, although o reduced by approximately 3-4 fold compared to the longer promoter fragments. However, the 621-bp, 572-bp, and 78-bp long promoter fragments yielded substantial~y no induction of GUS expression by lNA.
C. Treatment with BTH
Instead of INA as described above in Example SA, plant material is sprayed with BTH
as described by Goerlach et al., T~ e Plant Cell 8: 629-643, (1996); Friedrich et al.. Plant Jounzal ( 1996); and Lawton et al., Plant Joun~a~ (1996). BTH treated plant tissue is then subjected to a GUS assay as described above in Example SB.
D. Treatment with salicylic acid (SA) Instead of INA as described above in Example SA, plant material is sprayed with 5mM SA, sodium salt. SA treated plant tissue is then subjected to a GUS assay as described above in Example SB.

CA 02232741 1998-03-l9 - W O 98/03~36 PCTNS97/12626--C. Linker-Scanning Mutant Analysis ~xample 6: Preparation of Chimeric Genes Containing Linker-Scanning Mutants of the Arabidopsis PR-1 Promoter Sequence Fused to the ,B-glucuronidase (GUS) Reporter Gene A. Contruction of pLS l to pLS9 Plasmid pLTD6D was used as a template in PCR with a left-to-right "topstrand" primer extending from positions -887 to -867 (primer Anc 1: AGG TAT ACT GGA GAT AGG
AGG) upstream of the PR- I ATG and a right-to-left bottomstrand" primer comprising 26-bp o of PR-I promoter sequence (positions -715 to -741 upstream of the PR-1 ATG) and a further lO-bp containing a XbaI restriction site (primer LS 1-: GCT CTA GAG GGA AAA AAA
AAA AAA AAA AAA AAA AAA (SEQ ID NO: I l)). This PCR reaction was undertaken with AmpliTaq DNA polymerase according to the manufacturer's recommendations (Perkin ElmertRoche, Branchburg, NJ) for three cycles at 94~C (30 s), 50~C (30 s), and 72~C (30 s), followed by 30 cycles at 94~C (30 s), 55~C (30 s) and 72~C (30 s). This generated a product of 184-bp (fragment A 1) through annealing of the homologous PR- l promoter sequences; the fragment included a BstEII site from the PR- I promoter at its left end and a XbaI site at its right end. A second PCR reaction was done using the same template with a left-to-right "topstrand" primer comprising 22-bp of PR- I promoter sequence (positions -730 to -708 ~o upstream of the PR- I ATG) and a further l O-bp containing a Xbal restriction site (primer LS 1+: GCT CTA GAG CAA TCT CAA TGG GTG ATC TAT TG (SEQ ID NO: 12)) and a right-to-left "bottom strand" primer extending from positions -584 to -607 upstream of the PR-I ATG (primer PRIR: TAT TTG TTT CTT AGT GTT TCA TGC (SEQ ID NO:8)). This PCR reaction was done under the same conditions as the one described above and generated a ~5 fragment of 194-bp (fragment B 1) through annealing of the homologous PR- I promoter sequences; this fragment included a XbaI site at its left end and a NdeI site from the PR- 1 promoter at its right end.
Fragments A 1 and B I generated above were gel purified using standard procedures to remove oligonucleotides. Fragment A1 was cleaved with BstEII and XbaI (all restriction enzymes were purchased from Promega, Madison, WI) and fragment B I was cleaved with XbaI and NdeI. Both fragments were ligated into plasmid pLTD6D that had previously been digested with restriction enzymes BstEII and NdeI, resulting in plasmid pLS I .

- W098/03536 PCT~US97/12626 P}asmids pLS2 to pLS9 were constructed using the same strategy. For each construct a fragment A (A2 to A9) was amplified using left-to-right "topstrand" primer Ancl and a "bottomstrand" primer (LS2- to LS9-, respectively) and a fragment B (B2 to B9) was amplified using a left-to-right "topstrand" primer (LS2+ to LS9+, respectively) and "bottomstrand" primer P~lR. PCR fragments were gel purified and digested with the appropriate restriction enzymes (BstEII and XbaI for fragments A, XbaI and NdeI for fragments B). Corresponding pairs were ligated into pLTD6D as described before, resulting in plasmids pLS2 to pLS9.

o primer LS2-: GTC CTA GAG CTA TCC AAA AAG AAA ~AA AAA AAA A (SEQ ID
N0: 1 3) primer LS3-: GTC CTA GAT ACA TTG AGA TTT ATC CAA AAA G (SEQ ID N0: 14) primer LS4-: GTC CTA GAA TAT AGA TCA CCC ATT GAG ATT T (SEQ ID N0: 15) primer LS5-: GTC CTA GAT TGA AAC AGT CAA TAG ATC ACC (SEQ ID N0: 16) primer LS6-: GTC CTA GAG GGT GAC GTA GAG AAA CAG TCA A (SEQ ID N0: 17) primer LS7-: GTC CTA GAA AAA GTA AAA TAG TGA CGT AGA G (SEQ ID N0: 18) primer LS8-: GTC CTA GAT TTC TAT GAC GTA AGT AAA ATA GTG (SEQ ID
N0: 1 9) primer LS9-: GTC CTA GAC GTG CCG CCA CAT CTA TGA CGT A (SEQ ID N0:20) ~o primer LS2+: GTC CTA GAA TGG TGA TCT ATT GAC TGT TTC TC (SEQ ID ~0:21) primer LS3+: GTC CTA GAG ATG ACT GTT TCT CTA CGT CAC (SEQ ID N0:22) primer LS4+: GTC CTA GAA TTC TAC GTC ACT ATT TTA CTT AC (SLQ ID N0:23) primer LS5+: GTC CTA GAT ATA TTT TAC TTA CGT CAT AGA TGT G (SEQ ID
N0:24) primer LS6+: GTC CTA GAG AAC GTC ATA GAT GTG GCG GCA (SEQ ID N0:25) primer LS7+: GTC CTA GAT GTG TGG CGG CAT ATA TTC TTC AG (SEQ ID N0:26) primer LS8+: GTC CTA GAT TTA TAT TCT TCA GGA CTT TTC AGC (SEQ ID N0:27) primer LS9+: GTC CTA GAA TAG GAC TTT TCA GCC ATA GGC (SEQ ID N0:28) .~
B. Construction of pLS 10 to pLS 12 For each construct, a fragment A (A10 to A 12) was produced as described above using left-to-right "topstrand" primer Anc I and a right-to-left "bottomstrand" primer (LS 10- to ~6 CA 0223274l l998-03-l9 W O 98/03536 PCTrUS97/12626 LS 12-, respectively). However, instead of producing a corresponding fragment B, a pair of complementaryoligonucleotides(LS102andLS103forpLSlO,LS112andLS113forpLSI1, LS 122 and LS 123 for pLS 12) comprising PR- I promoter sequences and the desired mutation in the PR- 1 promoter were used. Each pair of annealed complementary oligonucleotides contained a XbaI overhang at its left end and a NdeI overhang at its right end. PCR fragments were gel purified and digested with BstEII and XbaI. Corresponding fragments A and annealed complementary oligonucleotides were ligated into pLTD6D as described before, resulting in plasmids pLS10 to pLS12.

lU primer LS10-: GTC CTA GAA CGA AGA ATA TAT GCC GCC AC (SEQ ID NO:29) primer LS 11 -: GTC CTA GAA GGA AAA GTC CTG AAG AAT ATA TG (SEQ ID
NO:30) primer LS 12-: GTC CTA GAA AGC CTA TGG CTG AAA AGT CC (SEQ ID NO:31) primer LS 102: CTA GAG GAG CCA TAG GCA AGA GTG ATA GAG ATA CTC A (SEQ
ID NO:32) primer LS 103: TAT GAG TAT CTC TAT CAC TCT TGC CTA TGG CTC CT (SEQ ID
NO:33) primer LS 112: CTA GAT GAA GAG TGA TAG AGA TAC TCA (SEQ ID NO:34) primer LS 113: TAT GAG TAT CTC TAT CAC TCT TCA T (SEQ ID NO:35) ~o primer LS 122: CTA GAT AGA GAT ACT CA (SEQ ID NO:36) primer LS 123: TAT GAG TAT CTC TAT (SEQ ID NO:37) C. Construction of pLS 13 A PCR fragment was produced as described above using left-to-right "topstrand" primer Anc I and a right-to-left "bottomstrand" primer comprising 24-bp of PR- I promoter sequence (positions -618 to -642 upstream from the PR-I ATG), the desired mutation in PR-I promoter and a NdeI restriction site (primer LS 13-: GGA ATT CCA TAT GCC AGA AGT CTT CAC
TCT TGC CTA TGG CTG AAA AG (SEQ ID NO:38)). The resulting 282-bp long fragment was gel purified, digested with BstEII and NdeI and ligated into pLTD6D as described before, resulting in pLS 13.

CA 02232741 1998-03-l9 - W O 98/03536 PCT~US97/126Z6.
-Example 7. Transformation of Arabidopsis A. Construction of pCIB200 TJS75Kan was first created by digestion of pTJS75 (Schmiflh~ cer and Helinski, J.
s Bacteriol. 164: 446-455 (1985)) with NarI to excise the tetracycline gene, followed by insertion of an AccI fragment from pUC4K (Messing, J. and Vierra, J., Gene 19: 259-268 (1982)) carrying aNptI gene. pCIB 200 was then made by ligating XhoI linkers to the EcoRV fragment of pCIB7 (containing the left and right T-DNA borders, a plant selectable nos/nptII chimeric gene and the pUC polylinker, Rothstein, S.J. et al., Gene 53: 153-161 (1987)) and cloning XhoI digested fragment into SalI digested TJS75Kan.
B. Construction of binary vectors Plasmids pLS I to pLS 13 were digested with restriction enzymes KpnI and Sacl. The fragments containing the PR- 1 promoter-GUS fusions were gel purified and ligated between the KpnI and SacI sites of pCIB200, resulting in plasmids pCIB/LS I to pCIBtLS 13, respectively.
C. Vacuum infiltration of Arabidopsis The binary vector constructs described in this example were transformed into Agrobacterium tumefaciens strain GV3101 (Berchtold, N. et al., CR Acad. Sci. Paris, Sciences de la vie, 316:1194-1199 (1993)) by electroporation (Dower, W.J., Mol. Biol. Rep ~o I :5. (1987)). Arabidopsis was transformed using the vacuum infiltration method (Berchtold7 N. et al., CR Acad. Sci. Paris, Sciences de la vie, 316: 1194- 1199 (1993)). Tl seeds were plated on 50mg/1 of kanamycin sulfate and resistant transformed lines were transfered to soii.
D. Transformation of Maize The binary vector constructs described in this example are transformed into maize ~s using the method described by Koziel et al., Biotechnology I 1: 194-200, (1993~ using particle bombardment into cells of immature embryos.
E. Transformation of Wheat The binary vector constructs described in this example are transformed into imm:~t1-re wheat embryos and imm~tl-re embryo-derived callus using particle bombardment as described by Vasil et al., Biotechnology I 1: 1553 - W 098/03S36 PCTnUS97/12626 Fxample 8: Deterrnination of the Inducibility of GUS expression by Chernical Regulators A. Treatment with INA
T2 seeds of each transformed line were harvested and plated on duplicate plates s containing 50mg/1 of kanamycin sulfate. After twenty days, one plate for each independent transgenic line was treated by spraying with 0.25 mg/ml INA (isonicotinic acid) while the duplicate was kept as control. Three days later, the seedlings were harvested, deep frozen and kept at -70~C.
B. Beta-Glucuronidase (GUS) Enzyme Assay o Frozen leaf tissue was ground in a mortar with a pestle in the presence of liquid nitrogen to produce a fine powder. Leaf extracts are prepared in GUS extraction buffer (50 mM sodium phosphate pH7.0, 0.1% Triton-X 100, 0.1% sarkosyl, 10 mM beta-mercaptoethanol) as described by Jefferson, R.A. et al., PNAS USA 83, 8447-8451 (1986).
The reactions are carried out in the wells of microtiter plates by mixing 10 ,ul of extract with 15 65 ~1 of GUS assay buffer (50 mM sodium phosphate pH 7.0, 10 mM EDTA, 0.1% Triton X-100, 10 mM beta-mercaptoethanol) containing 4-methyl umbelliferyl glucuronide (MU) at a final concentration of 2mM in a total volume of 75 ~11. The plate was incubated at 37~C for 30 minutes and the reaction was stopped by the addition of 225 ,ul of 0.2 M sodium carbonate. The concentration of fluorescent indicator released was determined by reading the ~o plate on a Flow Labs Fluoroskan II ELISA plate reader. Duplicate fluorescence values for each samples were averaged, and background fluorescence (reaction without MUG) was substracted to obtain thc concentration of MU for each sample. The amount of protein in each extract was determined using the Bio-Rad Protein Assay (Bio-Rad laboratories, Hercules, CA) according to the manufacturer's recommendations. The specific activity was ~5 determined for each sample and was expressed in pmoles MU/mg protein/minute.
Table 2 shows the average values of GUS activity (INA-treated/untreated controls) for the transgenic lines containing the linker-scanning mutant promoter constructs. Here, GUS
values are expressed in pmole MU/mg protein/min, and the number of independent transgenic lines used for the determination of each value are shown in column ~N). For each30 independent transgenic line, the induction of GUS expression by INA was obtained by dividing the specific activity of the INA-treated sample by the specific activity of the untreated control sample.

-Table Construct Control INA-Treated ~old Induction N
LS 1 44 250 ~.9 20 LS~ 69 658 9.8 20 LS3 76 676 10.4 20 LS4 316 4.073 20.8 20 LS5 302 ~,202 6.0 20 LS6 194 623 4.5 20 LS7 104 137 1.4 20 LS8 58 640 12.8 19 LS9 169 931 4.7 20 LS 10 207 237 1.7 30 LS 11 270 603 4.8 19 LS12 96 611 11.8 20 LS 13 128 535 5.3 20 wt 107 997 11.6 21 As shown in Table 2, most LS mutations had no effect or minor effects on the promoter activity. However, 3 of them had dramatic effects on the promoter function. One construct, LS4 (introducing a mutation at positions -666 to -675 (nucleotides 3584 to 3593 of SEQ ID NO: 1)), resulted in 2-fold higher average induction of GUS activity by INA than the control construct and approximatively 4-fold and 3-fold higher average GUS activity for INA-and water-treated samples, respectively. This suggested that a negative regulatory element had been mutated in this construct. Since both induced and llninclllcefl expression levels were influenced, the mutation seemed to affect a constitutive negative regulatory element. In two constructs, LS7 (mutation at positions -636 to -645 (nucleotides 3614 to 3623 of SEQ ID NO:
I )) and LS 10 (mutation at positions -606 to -615 ~nucleotides 3644 to 3653 of SEQ ID NO:
1)), a complete loss of inducibility of GUS activity by INA was observed. Average GUS
values for both water and INA treatments in transgenic lines containing LS7 were similar to s water-treated values for lines containing the control construct. In the case of LS 10, average GUS values were slightly higher becallse of two lines showing high llninducefl and induced GUS activity. These results are consistent with the presence of a positive regulatory element that is necessary for induction of PR-I gene expression by INA in or near the LS7 and LS 10 Iocations.
~o C. Treatment with BTH
Instead of INA as described above in Example 8A, plant material is sprayed with BTH
as described by Goerlach et al., The Plant Cell 8: 62g-643, (1996), Friedrich et al., Plant CA 02232741 1998-03-l9 - W O 98/03~36 PCT~US97/12626.
-Jo~nzal ( 1996); and Lawton et al., Plant Journal (1996). BTH treated plant tissue is thensubjected a GUS assay as described above in Example 8B.
D. Treatment with salicylic acid (SA) Instead of INA as described above in Example 8A, plant material is sprayed with 5mM SA, sodium salt. SA treated plant tissue is then subjected a GUS assay as described above in Example 8B.

D. ~n-vi~o ~ootprinting Analysis o Example 9: In-vivo Footprinting Arabidopsis plants (ecotype Columbia, Lehle Seeds, Tucson, AZ) were grown in autoclaved Fafard super-fine germinating mix in growth chambers with 60% humidity for 9 hours at -250 pmol photon/m2/s and 20~C and for 15 hours in the dark at 18~C. After three to s four weeks, they were sprayed with 0.65mM INA. At different time intervals, plants were vacuum infiltrated in MS salts containing 0.04 to I % DMS and 0.01 % Silwet L-77 (Osi Specialties) for 2 min at room temperature~ washed twice in ice-cold water, flash frozen in liquid nitrogen and Iyophilised for 2 days. DNA was isolated with a modified CTAB method.
Lyophilised material was extracted in lOOmM Tris-HCI pH 7.5, 1 % CTAB, 0.7M NaCI, ~o I OmM EDTA, I % b-mercaptoethanol at 60~C for 45 min. After a chloroforrn/isoamylalcohol extraction, 0.6 volume isopropanol was added to the aqueous phase and incubated for 30 min at room temperature. The precipitate was resuspended in TE buffer and treated with RNaseA
for 30 min at 37~C. DNA was reprecipitated with 0.1 volume sodium acetate and 2.5 volumes ethanol and resupended in TE buffer. DNA was cleaved with I M piperidine for 30 ~5 min at 90~C, Iyophilised 3 times and resuspended in dionised water. As a control, purified genorriic DNA was treated with 0.5% DMS for 30 sec at room temperature and cleaved with piperidine as described above.
Ligation-mediated PCR (LM-PCR) was carried out (Mueller, P.R. and Wold, B, Science 246:780-786 (1989) and Brignon, P. et al, Plant Molecular Biology Manua~ B 18: 1 -34 ( 1993)). For analysis of the coding strand, piperidine-cleaved DNA and primer Pl - (ATT
TAC AGT CAG AAA AAA TAA AAG, positions -479 to -503 (SEQ ID NO: 39)) were heated at 95~C for S min, annealed at 50~C for 30 min and first strand synthesis was carried - W098/~3536 PCT~US97112626.
-out at 42~C for 5 min with Sequenase Version 1.0 (USB Biochemicals). A unidirectional staggered linker formed by LMPCR2 (GAA TTC AGA TC (SEQ ID NO: 40)) and LMPCR3 (TGA CCC GGG AGA TCT GAA TTC (SEQ ID NO: 41)) was ligated to the blunt-ended DNA molecules for 15 hours at 17~C. Exponential PCR was carried out with primerss LMPCR3 and P2- (AGT TTA TAT CTA CAG TCA ATT TTC AAA, -502 to -529 (SEQ ID
NO: 42)) using KCI-based Taq poymerase buffer supplemented with 2.5mM MgC12 under following conditions: 16 cycles at 9~~C/lmin, 55~C/2 min, 74~C/3 min and an addition of 5 sec to the extension step for every cycle, ~ollowed by one cycle at 94~C/lmin, 55~C/2 min, 74~C/10 min. The end-labeling PCR was carried out using primer P3- (GTT TAT ATC TAC
o AGT CAA TTT TCA AAT AAA AG, -503 to -535 (SEQ ID NO: 43)) in 5 cycles at 94~C/lmin, 60~C/2 min, 76~C/3 min. Non-coding strand analysis was carried out similarly using primer P41 + (CTT TTT TTT TTT TTT TTT TTT TTT TTT TC, -735 to -706 (SEQ IDNO: 44)) for first strand synthesis annealed to plant DNA at 50~C. A unidirectional staggered linker formed by LMPCR2 (GAA 'ITC AGA TC (SEQ ID NO: 40)) and LMPCRI (AGT
TAC TAG TGA GAT CTG AAT TC (SEQ ID NO: 45)) was ligated to the blunt-ended DNA
molecules and exponential PCR was carried out with primers LMPCR I and P52+ (TTT TTT
TTT TTT TTT CTT TTT GGA TAA ATC, -722 to -692 (SEQ ID NO: 46~) using an z~nne.~ling temperature of 55~C. End-labelling PCR was done with primer P53+ (TTT TTT
TTT TTT TTT CTT TTT GGA TAA ATC TC, -722 to -690 (SEQ ID NO: 47)) using an annealing tempetrature of 60~C. Amplified fragments were separated on a 0.4mm thick, 6%
polyacrylamide gel and dried for 30 min at 8~)~C. BioMax MR films were used without intensifying screen.
Analysis of the coding strand revealed inducible footprints at positions -629 and -628 and at position -604 (EIG. I ) (nucleotides 3630, 3631, and 3655 of SEQ ~D NO: I, respectively). At both sites, an increased band intensity after INA treatment was detected, indicating deprotection of these guanines upon INA treatment. These two footprints are located in sequences mutated by linker-sc~nning constructs LS8 and LS 11 (FIG. 1). Neither construct seemed to significantly influence the regulation of the promoter, but they are surrounding the sequence mutated in construct LS 10, which had lost inducibility by ~NA.
~o This suggests that that the region of the PR- I promoter around this site undergoes changes in its occupancy by DNA-binding proteins. No other change in band intensities could be W O 98/03536 _ PCTnUS97112626 --detected in the range of DMS concentrations tested (0.04% to 1%), suggesting that the described sites are the only ones affected after INA treatment.
min~tion of the non-coding strand revealed an inducible footprint at position -641 (3618 of SEQ ID NO: 1). In this case, too, deprotection was observed. The guanine at s position -641 is included in the sequence mutated in linker-scanning mutant LS7, which had lost inducibility by INA and that contains a recognition site for basic leucine zipper transcription factors at positions -645 to -640. Different DMS concentrations did not reveal any other inducible footprint.
These results show that the examined region undergoes changes in protein-DNA
o interactions and suggest that the above described elements are required for the induction itself ("switch" element) and are not just binding sites for constitutive transcriptional activators.

E. Methods for Isolating Transcriptional Regulatory Proteins l s Example 10: Screening of Expression Libraries (South-Western) An oligomer containing defined parts of the PR- I promoter, such as the sequence of LS4, LS7, or LS 10, is used to screen a cDNA expression library (Singh, H. et al.
Biotechniques 7:252-261 (lg89). A cDNA expression library is plated and the proteins are ~o transferred onto a nitrocellulose filter. The filter is probed with a radiolabelled oligomer containing one or more copies of the sequence of interest. Clones expressing proteins that bind to this sequence are detected by autoradiography and isolated.

Example I 1: Yeast One-Hybrid System ~5 An oligomer containing defined parts of the PR-I promoter. such as the sequence of LS4, LS7, or LS 10, is used as a bait in a yeast one-hybrid system (Li, J.J. and Herskowitz, I.
Science262:1870-1874(1993)). Thechosensequenceisfusedupstreamofaminimal promoter and a reporter gene and transformed into yeast. The resulting yeast strain is ~ 30 transformed with a cDNA expression library fused to a yeast activation domain. Upon specific interaction between the bait and a fusion protein, transcription of the reporter gene is activated. The corresponding clone is isolated.

CA 02232741 1998-03-l9 - WO 98/03536 _ PCTrUS97/12626 .

F. Methods for Construction of Inducible Hybrid Promoters Example 12: Inducible Hybrid Promoters The above described elements (one repeat or preferably several repeats) are fused to a minim~l promoter in order to obtain inducible gene expression. For example~ the region of the PR- I promoter spanning LS7 through LS lO (nucleotides 3614-3653 of SEQ ID NO: 1 ) may be used to confer inducibility to a promoter fragment. Transcriptional enhancer elements o are also included into the synthetic promoter in order to obtain increased gene expression.

Example 13: Inducible Tissue- or Organ-Specific Promoters The elements described above in Example 12 (one repeat or preferably several repeats) are fused to or included into promoters that confer tissue- or organ-specific gene expression in order to obtain inducible gene expression in a particular tissue or organ.

W O 98/03~36 _ PCT~US97/12626.

SEQUENCE LISTING-(1) GENERAL INFORMATION:
(i) APPLICANT: Lebel, Edouard r Ryals, John Thorne, Leigh Uknes, Scott Ward, Eric (ii) TITLE QF INVENTION: Chemically Inducible Arabidopsis PR-1 Promoter (iii) NUMBER OF SEQUENCES: 51 (iv) CORRESPONDENCE ADDRESS:
(A) ADDRESSEE: Novartis Patent Department (B) STREET: 540 White Plains Road, P.O Box 2005 (C) CITY: Tarrytown (D) STATE: New York (E) COUNTRY: USA
(F) ZIP: 10591-9005 (v) COMPUTER READABLE FORM:
(A) MEDIUM TYPE: Floppy disk (B) COMPUTER: IBM PC compatible (C) OPERATING SYSTEM: PC-DOS/MS-DOS
(D) SOFTWARE: PatentIn Release #1.0, Version #1.30 (viii) ATTORNEY/AGENT INFORMATION:
(A) NAME: Meigs, J. Timothy (B) REGISTRATION NUMBER: 38,241 (C) REFERENCE/DOCKET NUMBER: CGC 1873/PCT
(ix) TELECOMMUNICATION INFORMATION:
(A) TELEPHONE: (919) 541-8587 (B) TELEFAX: (919) 541-8689 (2) INFORMATION FOR SEQ ID NO:l:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 4505 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO
(iv) ANTI-SENSE: NO

(ix) FEATURE:
(A) NAME~KEY: promoter (B) LOCATION: 1..4258 (D) OTHER INFORMATION: /note= "Full-length Arabidopsis PR-l Promoter Se~uence"
(ix) FEATURE:
(A) NAME/KEY: TATA_signal (B) LOCATION: 4229..4232 CA 0223274l l998-03-l9 W098/03536 PCT~US97/12626 (ix) FEATURE: ~
(A) NAME/KEY: misc_signal (B) LOCATION: 4294.:4296 (D) OTHER INFORMATION: /note= "Start codon ~or translation N
(ix) FEATURE:
(A) NAME/KEY: misc_feature (B) LOCATION: 2966 .4258 (D) OTHER INFORMATION: /note= "1293-bp long Arabidopsis thaliana PR-1 promoter ~ragment in plasmid pLTD6D - used for LS construct construction"
(ix) FEATURE:
(A) NAME/KEY: misc_feature (B) LOCATION: 3444..4258 (D) OTHER INFORMATION: /note= "815-bp long Ara~idopsis thaliana PR-1 promoter fragment in plasmid pLTD7D"
(ix) FEATURE:
(A) NAME/KEY: misc_~eature (B) LOCATION: 3561..4258 (D) OTHER INFORMATION: /note= "698-bp long Arabidopsis thaliana PR-l promoter fragment in plasmid pLTD71D"
(ix) FEATURE:
(A) NAME/ ~ Y: misc_~eature (B) LOCATION: 3638..4258 (D) OTHER INFORMATION: /note= "621-bp long Arabidopsis thaliana PR-1 promoter fragment in plasmid pLTD72D"
(ix) FEATURE:
(A) NAME/KEY: misc_feature (B) LOCATION: 3554..3563 (D) OTHER INFORMATION: /note= "LS1"
(ix) FEATURE:
(A) NAME/KEY: misc_feature (B) LOCATION: 3564..3573 (D) OTHER INFORMATION: /note= "LS2"
(ix) FEATURE:
(A) NAME/ ~ Y: misc_feature (B) LOCATION: 3574..3583 (D) OTHER INFORMATION: /note= "LS3"
(ix) FEATURE:
(A) NAME/KEY: misc_feature (B) LOCATION: 3584..3593 (D) OTHER INFORMATION: /note= "LS4"
(ix) FEATURE:
(A) NAME/KEY: misc_~eature (B) LOCATION: 3594.~3603 (D) OTHER INFORMATION: /note= "LS5"
(ix) FEATURE:
(A) NAME/KEY: misc_feature (B) LOCATION: 3604..3613 (D) OTHER INFORMATION: /note= "LS6"
(ix) FEATURE:
(A) NAME/~EY: misc_reature (B) LOCATION: 3614 .3623 CA 02232741 1998-03-l9 W O 98/03536 _ PCT~US97/12626 (D) OTHER INFORMATION: /note= "LS7"
~ (ix) FEATURE: ~
(A) NAME/KEY: misc_~eature (B) LOCATION: 3624. 3633 (D) OTHER INFORMATION: /note= "LS8"
(ix) FEATURE:
(A) NAME/KEY: misc_~eature (B) LOCATION: 3634. 3643 (D) OTHER INFORMATION: /note= "LS9"
(ix) FEATURE:
(A) NAME/KEY: misc_~eature (B) LOCATION: 3644..3653 (D) OTHER INFORMATION: /note= "LS10"
(ix) FEATURE:
(A) NAME/KEY: misc_~eature (B) LOCATION: 3654..3663 (D) OTHER INFORMATION: /note= "LSll"
(ix) FEATURE:
(A) NAME/KEY: misc_~eature (B) LOCATION: 3664..3671 (D) OTHER INFORMATION: /note= "LS12"
(ix) FEATURE:
(A) NAME/KEY: misc_~eature (B) LOCATION: 3672..3681 (D) OTHER INFORMATION: /note= "LS13"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:l:

AA'l"l'G~ l"l' GACGAGATGG CTATCCTGCT CAGTTTTTAA TTGCTGCTTG GTCGATCTTG 300 TAAATATATG CATCTCTACG TCCTCGTTTT ~ CT CTA~ ~ TGGTATAAGG 780 CA 0223274l l998-03-l9 WO 98/~3536 PCTAUS97/12626-~ CTTACACATC TTAGTTTTGC TGATGATATT ATGGTCTTCA TGGATGGTAC TCTTGGTTCT 960 GTGTCCAAGT CCACAATATT TGATGCGGGT CGAGGGAAGA TGACTTTGGA AATAGGGGCC 1080 "

ACATATTGTA 'l"l'~'l'~'l'~'l"l"l' AAAGTAAATT ~ ATA CAAAGAATAT ~"l"l"l~TGGAG 2040 AAGCAAAGAG AATACATACT TACGTAGGAA 'l'~''l"l"l"l"l'~'l"l' TT~ C ACAACGTAAG 2100 GCATGTAACC TTCATTTATC ATTCATTTTA ~'l"l"l'~'l'AACT TTTTATTAGA TTTTGATCAA 2280 TTCTAATTTA CATTGGTTTC GT~ C GAAAGGAGAC AACTATCTTT TTAAAAGCTT 2700 GT~~ A GTTTTGAGAG TTTAAGGTTT ATGATCGGAA CTTAGAGTKT AAATTTAAAC 2820 CA 02232741 1998-03-l9 W O 98/03536 PCT~US97/12626 -TATTTTGTTA ATTTTTGGAC TGATAACAGT ~ GA AAATATTGAA AC~'1"1'(:'1"1"1'A 2880 GTTTGGAAAA AAAAAACAAA GTGTATACAA TGTCAATCGG TGATCTTTTT ~ 3 540 ~ GG ATAAATCTCA ATGGGTGATC TATTGACTGT TTCTCTACGT 3600 'l"l"l"l"l"l'~'l"L"l' TATTTGAAAA TTGACTGTAG ATATAAACTT TTATTTTTTC TGACTGTAAA 3780 CAATGGCAAA GCTACCGATA CGAAACAATA TTAGGAAAAA ~ AAG GACAAGATTG 4080 (2) INFORMATION FOR SEQ ID NO:2:
~i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 28 base pairs (B) TYPE: nucleic acid W 098/03536 PCT~U$97/1262 --.
(C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: ~desc = "Oligonucleotide primer extl"
(iii) HYPOTHETICAL: NO
(iv) ANTI-SENSE: NO

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:2:

(2) INFORMATION FOR SEQ ID NO:3:
(i) SEQUENCE CXARACTERISTICS:
(A) LENGTH: 17 base pairs (B) TYPE: nucleic acid ~C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "Oligonucleotide primer la"
(iii~ HYPOTHETICAL: NO
(iv) ANTI-SENSE: NO

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:3:
GGCAAAGCTA CCGATAC l7 (2) INFORMATION FOR SEQ ID NO:4:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 20 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc - "Oligonucleotide primer lb"
(iii) HYPOTHETICAL: NO

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:g:
GGACGTAACA '1"1"1"1"1'~'1'AAG 20 (2) INFORMATION FOR SEQ ID NO:5:

(i) SEQUENCE CHARACTERISTICS:
~A) LENGTH: 20 base pairs CA 0223274l l998-03-l9 WO 98/03536 PCT~US97/1262G

(B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linea~
(ii) ~OLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = NOligonucleotide primer lc"
(iii) HYPOTHETICAL: NO

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:5:

(2) INFORMATION FOR SEQ ID NO:6:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 17 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "Oligonucleo~ide primer ld"
(iii) HYPOTHETICAL: NO

(xi) SEQUENCE DESCRIPTION: ~EQ I~ NO~

(2) INFORMATION FOR SEQ ID NO:7:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 30 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) ~OLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "Oligonucleotide primer Nl,076"
(iii) HYPOTHETICAL: NO

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:7:
ACCGCTCGAG AA~ ~lG ATTCGGAGGG 30 (2) INFORMATION FOR SEQ ID No:8:
(i) SEQUENCE CHARACTERISTICS~
(A) LENGTH: 24 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear ' -CA 0223274l l998-03-l9 WO 98/03536 PCT~US97/12626 (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "Oligonucleotide primer PRlR"
(iii) HYPOTHETICAL: NO

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:8:
TATTTGTTTC TTA~ L~ C ATGC 24 (2) INFORMATION FOR SEQ ID NO:9:
(i) SEQUENCE CHAP~ACTERISTICS:
(A) LENGTH: 30 base pairs (B) TYPE: nucleic acid tC) STRANDEDNESS: 5 ingle (D) TOPO~OGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "Oligonucleotide primer N731"
(iii) HYPOTHETICAL: NO

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:9:

(2) INFORMATION FOR SEQ ID NO:10:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 30 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCPIPTION: /desc = "Oligonucleotide primer N704"
(iii) HYPOTHETI Q L: NO

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:10:

(2) INFORMATION FOR SEQ ID NO:ll:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 36 base pairs (B) TYPE: nucleic acid (C) STP~ANDEDNESS: single (D) TOPOLOGY: linear W O 98/03536 PCT~US97/12626-(ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS1-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:11:
GCTCTAGAGG GAAAAAAAA~ AAAAAAAAAA AAAAAA 36 (2) INFORMATION FOR SEQ ID NO:12:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 32 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS1+"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:12:

(2) INFORMATION FOR SEQ ID NO:13:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 34 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS2-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:13:

(2) INFORMATION FOR SEQ ID NO:14:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 31 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS3-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:14:
GTCCTAGATA CATTGAGATT TATCC~AAAA G 31 CA 0223274l l998-03-l9 WO 98/03536 PCT~US97/12626--(2) INFORMATION FOR SEQ ID NO:15: -(i) SEQUENCE CHARACTERISTI-CS:
(A) LENGTH: 31 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single tD) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS4-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:15:

(2) INFORMATION FOR SEQ ID NO:16:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 30 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS5-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:16:

(2) INFORMATION FOR SEQ ID NO:17:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 31 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS6-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:17:

(2) INFORMATION FOR SEQ ID NO:18:
(i) SEQUENCE C~ARACTERISTICS:
(A) LENGTH: 31 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single tD) TOPOLOGY: linear tii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS7-"
.

W O 98/03536 PCTrUS97/1262C
-(xi) SEQUENCE DESCRIPTION: SEQ ID NO:18:

(2) INFORMATION FOR SEQ ID NO:19:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 33 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: ~desc = "primer LS8-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:19:

(2) INFORMATION FOR SEQ ID NO:20:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 31 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS9-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:20:

(2) INFORMATION FOR SEQ ID NO:21:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 32 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS2~"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:21:

(2) INFORMATION FOR SEQ ID NO:22:

WO 98/03536 PCT~US97/1262 (i) SEQUENCE CHARACTERISTICS: -. (A) LENGTH: 30 base pairs - (B) TYPE: nucleic acid ( C ) sTRA~nF nT~ S: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS3+"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:22:
GTCCTAGAGA TGA~ C TCTACGTCAC 30 (2) INFORMATION FOR SEQ ID NO:23:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 32 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS4+"

(xi) SEQUENCE DESCRIPTION: SEQ ID No:23:

(2) INFORMATION FOR SEQ ID NO:24:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 34 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc - "primer LS5~"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:24:

(2) INFORMATION FOR SEQ ID NO:25:
(i) SEQUENCE C~ARACTERISTICS:
(A) LENGTH: 30 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: ~ingle (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS6+"

CA 02232741 l99X-03-l9 W O 98/03536 PCT~US97/12626 -(xi) SEQUENCE DESCRIPTION. SEQ ID NO:25:

(2) INFORMATION FOR SEQ ID NO:26:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 32 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS7+"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:26:

(2) INFORMATION FOR SEQ ID NO:27:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 33 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS8+"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:27:

(2) INFORMATION FOR SEQ ID NO:28:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 30 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPO~OGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS9+"

(xi) ~QU~N~: DESCRIPTION: SEQ ID NO:28:

(2) INFORMATION FOR SEQ ID NO:29:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 29 base pairs CA 0223274l l998-03-l9 W O 98/03~36 PCT~US97/12626-(B~ TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS10-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:29:

(2) INFORMATION FOR SEQ ID NO:30:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 32 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS11-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:30:

(2) INFORMATION FOR SEQ ID NO:31:
(i) SEQUENCE CHARACTERISTICS:
~A) LENGTH: 29 ~ase pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single ~D) TOPOLOGY: linear (ii) ~OLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LSl2-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:31:

(2) INFORMATION FOR SEQ ID NO:32:
(i) SEQUENCE CHAR~CTERISTICS:
(A) LENGTH: 37 ~ase pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS102"

W O 98/03536 PCT~US97112626 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:32: - ~

(2) INFORMATION FOR SEQ ID NO:33:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 35 base pairs (B) TYPE: nucleic acid (C) STRAWDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS103"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:33:

(2) INFORMATION FOR SEQ ID NO:34:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 27 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid ~A) DESCRIPTION: /desc = "primer LS112"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:3q:

(2) INFORMATION FOR SEQ ID NO:35:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 25 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS113"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:35:

(2) INFORMATION FOR SEQ ID NO:36:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 17 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single W 098/03536 PCT~US97/12626-~D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS122"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:36:

(2) INFORMATION FOR SEQ ID NO:37:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 15 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "pri~er LS123"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:37:

(2) INFORMATION FOR SEQ ID NO:38:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 47 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LS13-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:38:

(2) INFORMATION FOR SEQ ID NO:39:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 24 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer Pl-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:39:

5~

CA 0223274l l998-03-l9 W O 98/03536 . PCTrUS97/12626-(2) INFORMATION FOR SEQ ID NO:40:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 11 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LMPCR2"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:40:

(2) INFORMATION FOR SEQ ID NO:41:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 21 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LMPCR3"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:41:

(2) INFORMATION FOR SEQ ID NO:42:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 27 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer P2-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:42:

(2) INFORMATION FOR SEQ ID NO:43:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 32 base pairs (B) TYPE: nucleic acid (C) sTRANnFnN~s single (D) TOPOLOGY: linear W 098/03536 PCTnUS97/12626-(ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer P3-"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:43:

(2) INFORMATION FOR SEQ ID NO:44:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 29 base pairs (B~ TYPE: nucleic acid (C) STR~Nn~nNFSS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = 1I primer P41+"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:44:

(2) INFORMATION FOR SEQ ID NO:45:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 23 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer LMPCR1"

(xi) SEQUENCE DESCRIPTION: SEQ ID No:45:

(2) INFORMATION FOR SEQ ID NO:g6:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 30 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer P52+"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:46:

- W O 98/03S36 PCTrUS97/12626-(2) INFORMATION FOR SEQ ID NO:47:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 32 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single ~ (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "primer P53~"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:47:
1"1' TGGATAAATC TC 32 (2) INFORMATION FOR SEQ ID NO:48:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 6 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = "recognition site of the yeast transcription factor GCN4"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:48:

(2) INFORMATION FOR SEQ ID No:49:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 8 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = " recognition site of the bZIP
transcription factor CREB"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:49:

(2) INFORMATION FOR SEQ ID NO:50:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 6 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear .

CA 0223274l l998-03-l9 - W O 98/03536 _ PCTAUS97/12626.

(ii) MOLECULE TYPE: other.nucleic acid (A) DESCRIPTION: /desc = " recognition site foY bZIP
transcription factors"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:50:

(2) INFORMATION FOR SEQ ID NO:51:
(i) SEQUENCE CHARACTERISTICS:
(A) LENGTH: 11 base pairs (B) TYPE: nucleic acid (C) STRANDEDNESS: single (D) TOPOLOGY: linear (ii) MOLECULE TYPE: other nucleic acid (A) DESCRIPTION: /desc = " consensus recognition sequence of NF-kB"

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:51:

Claims (23)

What Is Claimed Is:

1. An isolated DNA molecule comprising a nucleotide sequence selected from the following group:
a) a full-length chemically inducible promoter fragment comprising nucleotides 1through 4258 of SEQ ID NO: 1;
b) an 815-bp long chemically inducible promoter fragment comprising nucleotides 3444 through 4258 of SEQ ID NO: 1; and c) a 698-bp long chemically inducible promoter fragment comprising nucleotides 3561 through 4258 of SEQ ID NO: 1.

2. The isolated DNA molecule of claim 1, comprising the full-length promoter fragment comprising nucleotides 1 through 4258 of SEQ ID NO: 1.

3. The isolated DNA molecule of claim 1, comprising the 815-bp long PR-1 promoter fragment comprising nucleotides 3444 through 4258 of SEQ ID NO: 1.

4. The isolated DNA molecule of claim 1, comprising the 698-bp long PR-1 promoter fragment comprising nucleotides 3561 through 4258 of SEQ ID NO: 1.

5. A chimeric gene comprising the DNA molecule of claim 1 operatively linked to a coding sequence, wherein the DNA molecule regulates transcription of said codingsequence.

6. The chimeric gene of claim 5, wherein said coding sequence encodes an enzyme.

7. The chimeric gene of claim 6, wherein said enzyme is an assayable marker.

8. The chimeric gene of claim 7, wherein said assayable marker is GUS.

9. A recombinant vector comprising the chimeric gene of claim 5.

10. A plant cell stably transformed with the vector of claim 9.

11. The plant cell of claim 10, which is a maize cell.

12. The plant cell of claim 10, which is a wheat cell.

13. The plant cell of claim 10, which is an Arabidopsis cell.

14. An isolated DNA molecule involved in inducibility of a chemically inducible promoter selected from the following group:
a) LS4 comprising nucleotides 3584 through 3593 of SEQ ID NO: 1;
b) LS7 comprising nucleotides 3614 through 3623 of SEQ ID NO: 1;
c) LS10 comprising nucleotides 3644 through 3653 of SEQ ID NO: 1; and d) a region spanning LS7-LS10 and comprising nucleotides 3614 through 3653 of SEQ ID NO: 1.

15. The isolated DNA molecule of claim 14, wherein said DNA molecule comprises anegative regulatory element and comprises nucleotides 3584 through 3593 of SEQ ID NO: 1.

16. The isolated DNA molecule of claim 14, wherein said DNA molecule comprises an element necessary for inducibility of said chemically inducible promoter and comprises nucleotides 3614 through 3623 of SEQ ID NO: 1.

17. A chemically inducible hybrid promoter comprising the DNA molecule of claim 16 operatively linked to a minimal promoter fragment, whereby said DNA molecule confers inducibility to said minimal promoter fragment.

18. The isolated DNA molecule of claim 14, wherein said DNA molecule comprises an element necessary for inducibility of said chemically inducible promoter and comprises nucleotides 3644 through 3653 of SEQ ID NO: 1.

19. A chemically inducible hybrid promoter comprising the DNA molecule of claim 18 operatively linked to a minimal promoter fragment, whereby said DNA molecule confers inducibility to said minimal promoter fragment.

20. The isolated DNA molecule of claim 14, wherein said DNA molecule comprises elements necessary for inducibility of said chemically inducible promoter and comprises nucleotides 3614 through 3653 of SEQ ID NO: 1.

21. A chemically inducible hybrid promoter comprising the DNA molecule of claim 20 operatively linked to a minimal promoter fragment, whereby said DNA molecule confers inducibility to said minimal promoter fragment.

22. A method of isolating transcriptional regulatory proteins, comprising the steps of:
a) screening a cDNA expression library with an oligomer comprising the DNA
molecule of claim 14;
b) detecting clones expressing proteins that bind to said DNA molecule; and c) isolating said clones expressing said proteins.

23. A method of isolating transcriptional regulatory proteins using a yeast one-hybrid system, comprising the steps of:
a) fusing the DNA molecule of claim 14 upstream of a minimal promoter and a reporter gene coding sequence to construct bait;
b) transforming the bait into yeast;
c) transforming said yeast with a cDNA expression library fused to a yeast activation domain;
d) activating transcription of the reporter gene upon specific interaction between the bait and a transcriptional regulatory protein;
e) detecting a clone expressing said regulatory protein; and f) isolating said clone expressing said protein.