Creatine Kinase

**Definition:** A transferase that catalyzes formation of PHOSPHOCREATINE from ATP + CREATINE. The reaction stores ATP energy as phosphocreatine. Three cytoplasmic ISOENZYMES have been identified in human tissues: the MM type from SKELETAL MUSCLE, the MB type from myocardial tissue and the BB type from nervous tissue as well as a mitochondrial isoenzyme. Macro-creatine kinase refers to creatine kinase complexed with other serum proteins.

**Tree numbers:** - D08.811.913.696.640.150

**Synonyms:** - ADP Phosphocreatine Phosphotransferase - ATP Creatine Phosphotransferase - Creatine Phosphokinase