<unk>  (also known as<unk>  or myokinase) is a phosphotransferase enzyme that catalyzes the interconversion of adenine nucleotides, and plays an important role in cellular energy homeostasis (see the "Biological homeostasis" section of "Homeostasis").  The reaction catalyzed is:
The equilibrium constant in the direction written is 0.44. Thus, the ΔGo for this reaction is close to zero. In muscle of a variety of species of vertebrates and invertebrates, the concentration of ATP is typically 7-10 times that of ADP, and usually greater than 100 times that of AMP . The rate of oxidative phosphorylation is controlled by the availability of ADP. Thus, the mitochondrion attempts to keep ATP levels high due to the combined action of<unk>  and the controls on oxidative phosphorylation.
Adenylate kinase
Adenylate cyclase
Caspase
Diastase
Calmodulin
Phosphatase
GTPase activating protein
ATPase