http://www.rcsb.org/pdb/files/1avd.pdb1

The key is adding 1 to the suffix.  Sometimes there is more than one biological 
unit, in which case, there is a pdb2, pdb3, etc.

-David

On May 3, 2011, at 4:00 PM, Martin Hediger <ma....@bluewin.ch> wrote:

> Dear all
> I would like to ask how it is possible to download the coordinate file 
> for the biological assembly of a protein structure from the PDB.
> Naturally, this is not a question directly related to PyMOL, but I 
> thought I'll be reaching at least a couple of 
> Biochemists/Chrystallographers who know how to do this.
> As an example, when downloading the PDB file of "1AVD", I get a file 
> with two chains. The biological assembly would be a tetramer, so I 
> wonder what URL I would require to write into a script that does the 
> downloading.
> 
> Thanks for help on this.
> Martin
> 
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