Final answer:
Cyclic AMP-dependent protein kinases, also known as PKA or protein kinase A, are enzymes that are activated by binding to cyclic AMP (cAMP). They regulate various metabolic pathways in cells by phosphorylating target proteins on serine and threonine residues, activating them.
Step-by-step explanation:
Cyclic AMP-dependent protein kinases, also known as PKA or protein kinase A, are enzymes that are activated by binding to cyclic AMP (cAMP).
cAMP is a second messenger molecule synthesized by the enzyme adenylyl cyclase from ATP. Once activated, PKA regulates various metabolic pathways in cells by phosphorylating target proteins on serine and threonine residues, activating them.