Creatine Kinase

**Semantic type:** Amino Acid, Peptide, or Protein|Enzyme

**Definition:** An enzyme complex that can reversibly convert ATP and creatine to phosphocreatine and ADP. Cytosolic creatine kinases are comprised of homodimers or heterodimers of creatine kinase B-type protein and creatine kinase M-type protein. Mitochondrial creatine kinases are octomers comprised of either four homodimers of creatine kinase U-type, mitochondrial protein or four creatine kinase S-type, mitochondrial protein homodimers.

**Synonyms:** - ATP:Creatine N-Phosphotransferase - ATP:Creatine Phosphotransferase - Adenosine Triphosphate-Creatine Transphosphorylase - CK - CPK - Creatine Phosphokinase - Creatine Phosphotransferase - Phosphocreatine Kinase