[PyMOL] The problem of save molecule to PDB after mutagenesis wizard

Hi, pymol users.

I want to change same residues to another one.

I try to do it refer to following site, I changed TRY128 to PHE128,
http://www.pymolwiki.org/index.php/Mutagenesis

But when I save the modified molecular to PDB file, the sequence of residue
is out of turn.

Who can tell me how to fix this problem?

Thank a lot.

Jacky

The following is a part of PDB.(the original pdb file is start from 124)

ATOM      1  N   GLY A 124      -9.861  12.581   5.804  1.00  1.00
  N
TER       2      GLY A 124
ATOM      3  N   PHE A 128     -12.196  10.147   0.017  1.00  0.00
  N
TER       4      PHE A 128
ATOM      5  CA  GLY A 124     -10.625  12.191   4.609  1.00  1.00
  C
TER       6      GLY A 124
ATOM      7  CA  PHE A 128     -11.765   8.834   0.485  1.00  0.00
  C
TER       8      PHE A 128
ATOM      9  C   GLY A 124      -9.855  12.324   3.299  1.00  1.00
  C
TER      10      GLY A 124

[image: Inline image 1]