- Article -
| In Silico Biology 1, 0008 (1998); ©1998, Bioinformation Systems e.V. |
An evolutionary classification of the metallo-ß-lactamase fold proteins
L. Aravind
National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bldg. 38A, Bethesda, MD20894, USA
Department of Biology - BSBW, Texas A&M University, College Station, Texas 77843, USA
E-mail: Aravind@ncbi.nlm.nih.gov
Edited by N. Mermod; received March 21, 1998; revised version accepted May 22, 1998
Abstract
All the detectable metallo-ß-lactamase fold proteins were identified in the publicly available sequence databases and complete genome sequences using iterative profile searches with the PSI-BLAST program and motif searches with position specific weight matrices. The catalytic site/mechanism and the corresponding structural elements were characterized for these proteins based on the available structure of the Bacillus zinc-dependent b-lactamase. Based on pair-wise sequence and phylogenetic analysis an evolutionary classification for enzymes of this fold was developed and discussed in terms of implications for substrate specificity. Finally, some predicted inactive members which have been recruited for non-enzymatic functions such as microtubule binding in a cytoskeletal MAP1 are described.
Key words: b-lactamase, metal dependent hydrolases, poly-A specific RNA processing, DNA repair, inactive enzymes