cAMP (Cyclic 3', 5'-Adenosine Monophosphate)-dependent Protein Kinase, commonly known as PKA (Protein Kinase-A), is a second messenger-dependent enzyme that has been implicated in a wide range of cellular processes, including transcription, metabolism, cell cycle progression and apoptosis. Known modulators of PKA activity include factors that either activate or inhibit AC (Adenylate Cyclase), resulting in an increase or decrease in cAMP levels. The enzyme occurs naturally as a four-membered structure with two regulatory (R) and ...
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