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The ascent of nucleotide cyclases: conservation and evolution of a theme

Shenoy, Avinash R and Srinivasan, N and Visweswariah, Sandhya S (2002) The ascent of nucleotide cyclases: conservation and evolution of a theme. In: Journal of Biosciences, 27 (2). pp. 85-91.

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Abstract

Cyclic nucleotides are known to regulate a number of metabolic and developmental processes in all living organisms. There are two types of nucleotide cyclases, adenylyl cyclases that produce 3¢5¢- cyclic adenosine monophosphate (cAMP) and guanylyl cyclases that synthesize the corresponding guanosine (cGMP) analogue. Both enzymes utilize their respective nucleotide triphosphates as substrates, and require a metal co-factor, usually Mg or Mn, for catalysis (Tang and Hurley 1998). With information available from large scale genome sequencing projects, it is apparent that cyclases can be classified into different sub-classes, based on the amino acid sequence similarities, rather than their substrate specificities (see figure 1). Such a classification reveals interesting differences amongst these enzymes as a result of divergence in their structure.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Indian Academy of Sciences.
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: 22 Sep 2004
Last Modified: 19 Sep 2010 04:16
URI: http://eprints.iisc.ernet.in/id/eprint/2009

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