The most general solution to this problem boils down to one of graph isomorphism:

  http://en.wikipedia.org/wiki/Graph_isomorphism

James

On Apr 16, 2009, at 8:13 PM, rui wrote:

Dear all,

I want to pull out the sugar binding proteins from the pdb, however, there are so many different names for the ligand ( GAL, GLC, RIP... ) and it's not easy to get a complete list. If I want to pull out some fragments based on a specific geometry ( for instance, the glucose has C1 C2 C3 C4 C5 C6, and I want to use the geometry for instance, O5,C1, O1, C2 and O2 to pull out all the ligands that contains this kind of geometry. Is there any straightforward way to do it?

Thanks a lot.

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