12/21/2007

adenylate cyclases

Adenylyl (adenylate) cyclases are transmembrane enzymes that cross the membrane twelve times, and which convert ATP to the second-messenger cAMP (3',5' cyclic AMP) and pyrophosphate (Pi).

Adenylyl cyclases are coincidence detectors, meaning that they are only activated by several different signals occurring together – they are modulated by G-proteins, forskolin, Ca2+/calmodulin, and other class-specific substrates.

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