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Re: [modeller_usage] Chain designation in completing a structure.

On 12/10/09 10:56 AM, Steve Seibold wrote:
I am attempting to “complete” a structure by placing in a loop and doing
loop refinement. The problem I am having is setting up the
“alignment.ali” correctly…I think? The protein has two chains, A and B.
I am using the “alignment.ali” file shown below: Chain C starts with
“1”, Chain D starts with “2”, and ends with 1505. So, Chain D has 1504
residues. The “python script” used for running Modeller is shown below
the alignment.ali file.


structureX:2PPB_CD: 1 :C:1504:D:undefined:undefined:-1.00:-1.00
return selection(self.residue_range('1244:D', '1250:D'))

When you make a selection, it is using the numbering of the target (model) not the template. For consistency, Modeller always numbers the target residues starting from 1, and the chains starting at A. So while your template may have chains C and D, the model will have chains A and B. So you need to modify that selection to use the model numbering - or, alternatively, renumber the model residues to your own preference (see http://salilab.org/archives/modeller_usage/2009/msg00245.html) Either of these changes are only in the Python script though - your alignment file looks fine to me.

	Ben Webb, Modeller Caretaker
Modeller mail list: http://salilab.org/mailman/listinfo/modeller_usage