You could try contacting Dr. Arthur Lesk or Dr. Cyrus Chothia at the MRC Laboratory of Molecular Biology, Hills Road, Cambridge, CB2 2QH, UK. They both work on analysis of protein structures and there are also several crystallographers at the same lab. Their e-mail are: Arthur Lesk: aml2 at mrc-lmb.cam.ac.uk Cyrus Chothia: chc1 at mrc-lmb.cam.ac.uk