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The Adenylyl Cyclase Family

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Publisher Springer
Specialty Biochemistry
Date 1991 May 12
PMID 1656197
Citations 4
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Abstract

Hormone-sensitive adenylyl cyclase is a model system for the study of receptor-mediated signal transduction. It is comprised of three types of components: 1) receptors for hormones that regulate cyclic AMP (cAMP) synthesis, 2) regulatory GTP binding proteins (G proteins), and 3) the family of enzymes, the adenylyl cyclases. Concentrations of cAMP are altered by at least 35 different stimulatory or inhibitory hormones and neurotransmitters. Other signalling pathways may also influence cAMP production through regulation of particular adenylyl cyclase subtypes. The second messenger, cAMP propagates the hormone signal through the effects of cAMP-dependent protein kinase. While structural information on the adenylyl cyclases is limited, a cDNA clone for a calmodulin-sensitive form of bovine brain adenylyl cyclase has been isolated. The amino acid sequence encoded by the Type I cDNA is approximately 40% identical to those specified by three other adenylyl cyclase cDNAs that have been cloned subsequently. This degree of structural variation implies that there must be functional differences between the adenylyl cyclases.

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