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Vol. 10, Issue 2, 204-219, February 2000

Functional Classification of cNMP-binding Proteins and Nucleotide Cyclases with Implications for Novel Regulatory Pathways in Mycobacterium tuberculosis

Lee Ann McCue, Kathleen A. McDonough, and Charles E. Lawrence1

The Wadsworth Center for Laboratories and Research, New York State Department of Health, Albany, New York 12201-0509 USA

We have analyzed the cyclic nucleotide (cNMP)-binding protein and nucleotide cyclase superfamilies using Bayesian computational methods of protein family identification and classification. In addition to the known cNMP-binding proteins (cNMP-dependent kinases, cNMP-gated channels, cAMP-guanine nucleotide exchange factors, and bacterial cAMP-dependent transcription factors), new functional groups of cNMP-binding proteins were identified, including putative ABC-transporter subunits, translocases, and esterases. Classification of the nucleotide cyclases revealed subtle differences in sequence conservation of the active site that distinguish the five classes of cyclases: the multicellular eukaryotic adenylyl cyclases, the eukaryotic receptor-type guanylyl cyclases, the eukaryotic soluble guanylyl cyclases, the unicellular eukaryotic and prokaryotic adenylyl cyclases, and the putative prokaryotic guanylyl cyclases. Phylogenetic distribution of the cNMP-binding proteins and cyclases was analyzed, with particular attention to the 22 complete archaeal and eubacterial genome sequences. Mycobacterium tuberculosis H37Rv and Synechocystis PCC6803 were each found to encode several more putative cNMP-binding proteins than other prokaryotes; many of these proteins are of unknown function. M. tuberculosis also encodes several more putative nucleotide cyclases than other prokaryotic species.

1 Corresponding author.

10:204-219 ©2000 by Cold Spring Harbor Laboratory Press  ISSN 1088-9051/00 $5.00
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