[BioPython] Bio.PDB : model count in NMR structures

[Thomas Hamelryck]

Hi Arun,

> In the course of extracting sequence information for  a sub-set of PDB
> files and writing out specific parts using the Bio.PDB classes, I ran
> across an anomaly.  When parsing NMR structures, if I query the number
> of models present in the structure thus :
>
> str = p.get_structure('8tfv', '8tfv.pdb')
> mdls = Selection.unfold_entities(str, 'M')
>
> print len(mdls)
>
> , the number of models printed always exceeds the number present in
> the file by 1. A mdls[-1].get_list() yields an empty chain list. Is
> this a known issue, or even, a feature ?

Thanks for reporting this bug. I've fixed it in CVS.

BTW, len(str) will give you the number of models.

Best regards,

-Thomas

-- 
Thomas Hamelryck, Postdoctoral researcher
Bioinformatics center
University of Copenhagen      
Universitetsparken 15 Bygning 10                 
2100 Copenhagen, Denmark
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http://www.binf.ku.dk/users/thamelry/