Phosphodiesterase 5a (PDE5A) Active Protein

This gene encodes a cGMP-binding, cGMP-specific phosphodiesterase, a member of the cyclic nucleotide phosphodiesterase family. This phosphodiesterase specifically hydrolyzes cGMP to 5'-GMP. It is involved in the regulation of intracellular concentrations of cyclic nucleotides and is important for smooth muscle relaxation in the cardiovascular system. Alternative splicing of this gene results in three transcript variants encoding distinct isoforms. [provided by RefSeq, Jul 2008]

PDE5A: a cGMP-binding, cGMP-specific phosphodiesterase, a member of the cyclic nucleotide phosphodiesterase family. This phosphodiesterase specifically hydrolyzes cGMP to 5'-GMP. It is involved in the regulation of intracellular concentrations of cyclic nucleotides and is important for smooth muscle relaxation in the cardiovascular system. Phosphorylation is regulated by binding of cGMP to the two allosteric sites. Sildenafil (Viagra) is a highly selective and potent inhibitor of PDE5A. Alternative splicing results in four transcript variants encoding distinct isoforms.

Protein type: EC 3.1.4.35; Phosphodiesterase; Nucleotide Metabolism - purine

Chromosomal Location of Human Ortholog: 4q27

Cellular Component: cytosol

Molecular Function: 3',5'-cyclic-GMP phosphodiesterase activity; metal ion binding; cGMP binding; 3',5'-cyclic-nucleotide phosphodiesterase activity

Biological Process: positive regulation of MAP kinase activity; negative regulation of T cell proliferation; regulation of cGMP metabolic process; cGMP catabolic process; blood coagulation; signal transduction