Modeling and mutational analysis of the GAF domain of the cGMP-binding, cGMP-specific phosphodiesterase, PDE5

Sopory, Shailaja and Balaji, S and Srinivasan, N and Visweswariah, Sandhya S (2003) Modeling and mutational analysis of the GAF domain of the cGMP-binding, cGMP-specific phosphodiesterase, PDE5. In: FEBS Letters, 539 (1-3). pp. 161-166.

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Abstract

The GAFa domain of the cGMP-binding, cGMP-specific phosphodiesterase (PDE5A) was modeled on the crystal structure of PDE2A GAF domain and residues involved in cGMP binding identified. Tandem GAFa and GAFb domains of PDE5A, expressed in Escherichia coli, bound cGMP (Kd 27 nM). Mutation of aspartate-299 in GAFa, suggested earlier to be critical for cGMP binding, did not abrogate cGMP binding, but mutation of F205, which formed a stacking interaction with the guanine ring of cGMP, led to complete loss of cGMP binding. Therefore, the GAFa domain of PDE5A adopts a structure similar to the GAFb domain of PDE2A, and provides the sole site for cGMP binding in PDE5A.

Item Type:	Journal Article
Publication:	FEBS Letters
Publisher:	Elsevier
Additional Information:	Copyright of this article belongs to Elsevier.
Keywords:	cGMP;GAF domain;PDE5;Homology modeling;PDE2
Department/Centre:	Division of Biological Sciences > Molecular Biophysics Unit Division of Biological Sciences > Molecular Reproduction, Development & Genetics
Date Deposited:	28 Sep 2007
Last Modified:	19 Sep 2010 04:39
URI:	http://eprints.iisc.ac.in/id/eprint/11969

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