Una Bjarnadottir wrote:
Dear Users,
I'm converting trajectory files into .pdb files and when I there is only
one chain in them f.eks. only the  prtotein but not ligand or inhibitor
it does not set any chain identifier to the output .pdb files.  When I
have ligand and inhibitor in them the output will have chains A-B-C.
I tryed whatif but it can't read the big overall file.
The chain identifier is nessarry in some grafics programs so I really
need this.

Hope you can help, it will be hightly appreciated.

gromacs discards chain identifiers from PDB files when it reads them with pdb2gmx and will not re-create them.

Probably free software like VMD http://www.ks.uiuc.edu/Research/vmd/ can do what you need without these chain problems, rather than the graphics program you're planning to use.

I appreciate that English may not be your first language, but please do consider proof-reading your posts and/or using a spell-checker before you send. People on this list are much more likely to help you if you make it easy for them to do so, rather than work at trying to piece together your problem.

Mark
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