FATCAT: a web server for flexible structure comparison and structure similarity searching
The Burnham Institute, 10901 N. Torrey Pines Road, La Jolla, CA 92037 USA
* To whom correspondence should be addressed. Tel: +1 858 646 3168; Fax: +1 858 713 9930; Email: yye{at}burnham.org
Correspondence may also be addressed to Adam Godzik. Email: adam{at}burnham.org
Received February 13, 2004; Revised and Accepted April 12, 2004
Protein structure comparison, an important problem in structural biology, has two main applications: (i) comparing two protein structures in order to identify the similarities and differences between them, and (ii) searching for structures similar to a query structure. Many web-based resources for both applications are available, but all are based on rigid structural alignment algorithms. FATCAT server implements the recently developed flexible protein structure comparison algorithm FATCAT, which automatically identifies hinges and internal rearrangements in two protein structures. The server provides access to two algorithms: FATCAT-pairwise for pairwise flexible structure comparison and FATCAT-search for database searching for structurally similar proteins. Given two protein structures [in the Protein Data Bank (PDB) format], FATCAT-pairwise reports their structural alignment and the corresponding statistical significance of the similarity measured as a P-value. Users can view the superposition of the structures online in web browsers that support the Chime plug-in, or download the superimposed structures in PDB format. In FATCAT-search, users provide one query structure and the server returns a list of protein structures that are similar to the query, ordered by the P-values. In addition, FATCAT server can report the conformational changes of the query structure as compared to other proteins in the structure database. FATCAT server is available at http://fatcat.burnham.org.
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