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Vol. 95, Issue 11, 5857-5864, May 26, 1998

This paper was presented at the colloquium "Computational Biomolecular Science," organized by Russell Doolittle, J. Andrew McCammon, and Peter G. Wolynes, held September 11-13, 1997, sponsored by the National Academy of Sciences at the Arnold and Mabel Beckman Center in Irvine, CA.

Colloquium Paper
SMART, a simple modular architecture research tool: Identification of signaling domains

(computer analysis / diacylglycerol kinases / DEATH domain / disease genes / automatic sequence annotation)

Jörg Schultz*,dagger , Frank Milpetz*,dagger , Peer Bork*,dagger ,Dagger , and Chris P. Ponting§

* European Molecular Biology Laboratory, Meyerhofstr.1, 69012 Heidelberg, Germany; dagger  Max-Delbrunk-Center for Molecular Medicine, Robert-Rössle-Str 10, 13122, Berlin, Germany; and § University of Oxford, The Old Observatory, South Parks Road, Oxford OX1 3RH, United Kingdom

Accurate multiple alignments of 86 domains that occur in signaling proteins have been constructed and used to provide a Web-based tool (SMART: simple modular architecture research tool) that allows rapid identification and annotation of signaling domain sequences. The majority of signaling proteins are multidomain in character with a considerable variety of domain combinations known. Comparison with established databases showed that 25% of our domain set could not be deduced from SwissProt and 41% could not be annotated by Pfam. SMART is able to determine the modular architectures of single sequences or genomes; application to the entire yeast genome revealed that at least 6.7% of its genes contain one or more signaling domains, approximately 350 greater than previously annotated. The process of constructing SMART predicted (i) novel domain homologues in unexpected locations such as band 4.1-homologous domains in focal adhesion kinases; (ii) previously unknown domain families, including a citron-homology domain; (iii) putative functions of domain families after identification of additional family members, for example, a ubiquitin-binding role for ubiquitin-associated domains (UBA); (iv) cellular roles for proteins, such predicted DEATH domains in netrin receptors further implicating these molecules in axonal guidance; (v) signaling domains in known disease genes such as SPRY domains in both marenostrin/pyrin and Midline 1; (vi) domains in unexpected phylogenetic contexts such as diacylglycerol kinase homologues in yeast and bacteria; and (vii) likely protein misclassifications exemplified by a predicted pleckstrin homology domain in a Candida albicans protein, previously described as an integrin.


Dagger    To whom reprint requests should be addressed.

Copyright © 1998 by The National Academy of Sciences  0027-8424/98/955857-8$2.00/0
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