[PyMOL] nice DNA pdb and ring options

I have three questions I'm hoping someone can help with.

1. Does anyone have, or can anyone point me to a program that will 
generate a nice pdb file that contains 50 or so base pairs of random 
sequence B form DNA with hydrogen bonds between the bases or no H bonds?

I need to be able to scultp the DNA and have one strand react to the 
pulling of the other strand. I also want to show the union of the AT and 
GC via H bonds. The H bonds can be regular bonds (and probably will have 
to be if I'm going to be sculpting). I can make the h bonds and make 
them real bonds for the sculpting, I'm just wondering of anyone has 
already done it or has a script around....

2. When showing a cartoon of DNA the ribose ring in the backbone is 
always there no matter which setting you choose. How can I make the 
phosphates and the ribose rings show as a backbone cartoon "tube" and 
keep just the bases as filled sticks with rinngs?

3. Rings on DNA and RNA can be filled, in cartoon mode. But I can't get 
the rings to fill in on selected amino acids (H, W, Y, F) in a protein 
of that same file. Is there a fill amino acid ring setting?

Thanks in advance for anything you can offer,

Adam

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H. Adam Steinberg
Artist, Scientist
<http://adam.steinbergs.us>

Information Technology and Media Center
Department of Biochemistry
University of Wisconsin-Madison
433 Babcock Drive
Madison, WI 53706
608/265-4982
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