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Compartmentation of Cyclic Adenosine 3',5'-Monophosphate Signaling in Caveolae

Cardiovascular & Pulmonary Research Institute Allegheny University of the Health Sciences Pittsburgh, Pennsylvania 15212

The cAMP-signaling pathway is composed of multiple components ranging from receptors, G proteins, and adenylyl cyclase to protein kinase A. A common view of the molecular interaction between them is that these molecules are disseminated on the plasma lipid membrane and random collide with each other to transmit signals. A limitation to this idea, however, is that a signaling cascade involving multiple components may not occur rapidly. Caveolae and their principal component, caveolin, have been implicated in transmembrane signaling, particularly in G protein-coupled signaling. We examined whether caveolin interacts with adenylyl cyclase, the membrane-bound enzyme that catalyzes the conversion of ATP to cAMP. When overexpressed in insect cells, types III, IV, and V adenylyl cyclase were localized in caveolin-enriched membrane fractions. Caveolin was coimmunoprecipitated with adenylyl cyclase in tissue homogenates and copurified with a polyhistidine-tagged form of adenylyl cyclase by Ni-nitrilotriacetic acid resin chromatography in insect cells, suggesting the colocalization of adenylyl cyclase and caveolin in the same microdomain. Further, the regulatory subunit of protein kinase A (RII, but not RI) was also enriched in the same fraction as caveolin. Gs was found in both caveolin-enriched and non-caveolin-enriched membrane fractions. Our data suggest that the cAMP-signaling cascade occurs within a restricted microdomain of the plasma membrane in a highly organized manner.

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