I think SPASM by Gerard Kleywegt is a great tool for this sort of thing - you can set the similarity matrix threshold to make it more or less sequence independent (it still calculates the sequence match which is good for looking for key residues in the motif like structurally required GLYs). You can also restrict it to just CA positions. And you can set the thresholds for the search to narrow down on the basis of rmsd.
J Mol Biol. 1999 Jan 29;285(4):1887-97. Recognition of spatial motifs in protein structures. Kleywegt GJ. You can download the program and a search library - currently july 2008 pdb I think (culled to 99% seq ident. is the best one). But could be something more recent available? Good luck Martyn Martyn Symmons - Cambridge ________________________________ From: Patrick Loll <[email protected]> To: [email protected] Sent: Monday, 14 December, 2009 20:02:53 Subject: [ccp4bb] 3D search for peptide conformers? I have a 10-residue stretch of a protein that adopts an interesting conformation; I'd like to know if this conformation occurs in other proteins. I'd welcome suggestions for tools that will allow me to to search for this peptide conformation in the PDB. I naturally thought of DALI, but it seems to require a minimum length of 30 residues. Thanks, Pat --------------------------------------------------------------------------------------- Patrick J. Loll, Ph. D. Professor of Biochemistry & Molecular Biology Director, Biochemistry Graduate Program Drexel University College of Medicine Room 10-102 New College Building 245 N. 15th St., Mailstop 497 Philadelphia, PA 19102-1192 USA (215) 762-7706 [email protected]
