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Mutational analysis of the Mycobacterium tuberculosis Rv1625c adenylyl cyclase: residues that confer nucleotide specificity contribute to dimerization

Shenoy, Avinash R and Srinivasan, N and Subramaniam, M and Visweswariah, Sandhya S (2003) Mutational analysis of the Mycobacterium tuberculosis Rv1625c adenylyl cyclase: residues that confer nucleotide specificity contribute to dimerization. In: FEBS Letters, 545 (2-3). pp. 253-259.

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Abstract

The mycobacterial Rv1625c gene product is an adenylyl cyclase with sequence similarity to the mammalian enzymes. The catalytic domain of the enzyme forms a homodimer and residues specifying adenosine triphosphate (ATP) specificity lie at the dimer interface. Mutation of these residues to those present in guanylyl cyclases failed to convert the enzyme to a guanylyl cyclase, but dramatically reduced its adenylyl cyclase activity and altered its oligomeric state. Computational modeling revealed subtle differences in the dimer interface that could explain the biochemical data, suggesting that the structural and catalytic features of this homodimeric adenylyl cyclase are in contrast to those of the heterodimeric mammalian enzymes.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: Adenylyl cyclase;Guanylyl cyclase;Rv1625c;Homology modeling;Mycobacterium tuberculosis
Department/Centre: Division of Biological Sciences > Molecular Biophysics Unit
Division of Biological Sciences > Molecular Reproduction, Development & Genetics (formed by the merger of DBGL and CRBME)
Date Deposited: 17 Oct 2007
Last Modified: 19 Sep 2010 04:40
URI: http://eprints.iisc.ernet.in/id/eprint/12247

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