All you need it this pymol script for one molecule, or adapt it for more pdbs
(I might have missed an aa or you may want to include non-standard ones).

open mol.pdb
select 
////TRP+HIS+MET+ALA+GLY+PRO+CYS+LYS+TYR+ALA+ILE+VAL+LEU+SER+THR+ASN+ASP+GLN+GLU+PHE+ARG/
save path/mol_out.pdb,(sel01)

Hope this helps

Juan


Antony Oliver wrote:
> Dear Hyunchul,
>
> As far as I am aware - there is no "simple" way to do this - hopefully
> ccp4bb will prove me wrong!
>
> For your "exceptional" cases - I think there is really no other way
> apart from hand-editing or writing your own scripts.
>
> As a suggestion, scripting in PyMol is actually quite powerful, plus you
> can invoke the program without the graphics display - i.e. command line
> only.  If you know the name of the ligand, you can select everything
> else (i.e. the protein) and NOT the ligand - and then save out a new
> coordinates file.
>
> Many regards,
>
> Tony.
>
>
> Hyunchul Kim wrote:
>> I need to do this for many many pdb files so, is there any methods to
>> get protein chain only automatically?
>>
>> Best,
>>
>> Hyunchul
>>
>> 2007-08-30 (木) の 15:16 +0100 に Antony Oliver さんは書きました:
>>
>>> You could simply hand-edit the PDB file to remove the offending ligand.
>>>
>>> Regards,
>>>
>>> Tony.
>>>
>>>
>>>
>>>     Hi, all
>>>
>>>     I want to write a specific chain structures(protein). I tried PDBSET and
>>>     biopython but they couldn't deal with some exceptional case.
>>>     For example, some pdb files contain both protein structure and ligand
>>>     structure in a given chain ID(e.g. 'A' or ' ')
>>>
>>>     How can I obtain full chain structures without ligand structure by other
>>>     methods than clicking one by one at any website.
>>>
>>>     Thanks in advance.
>>>
>>>     Best,
>>>     Hyunchul Kim
>>>
>>> --
>>> Dr Antony W Oliver
>>> CR-UK DNA Repair Enzymes Group
>>> Section of Structural Biology
>>> The Institute of Cancer Research
>>> 237 Fulham Road
>>> Chelsea
>>> London SW3 6JB
>>> Phone: 020 7153 5451 / 5571
>>> Fax:   020 7153 5457
>>> E-mail: [EMAIL PROTECTED]
>>> --
>>>
>>>
>>>
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>
>
> --
> Dr Antony W Oliver
> CR-UK DNA Repair Enzymes Group
> Section of Structural Biology
> The Institute of Cancer Research
> 237 Fulham Road
> Chelsea
> London SW3 6JB
> Phone: 020 7153 5451 / 5571
> Fax:   020 7153 5457
> E-mail: [EMAIL PROTECTED]
> --
>
>
>
> The Institute of Cancer Research: Royal Cancer Hospital, a charitable Company 
> Limited by
> Guarantee, Registered in England under Company No. 534147 with its Registered 
> Office at 123 Old
> Brompton Road, London SW7 3RP.
>
> This e-mail message is confidential and for use by the addressee only.  If 
> the message is received
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