<unk>  <unk> , also known as phosphocreatine<unk>  or<unk>  phosphokinase <unk>  is an enzyme (EC 2.7.3.2) expressed by various tissue types. It catalyses the conversion of<unk>  to phosphocreatine, consuming adenosine triphosphate (ATP) and generating adenosine diphosphate (ADP).
In tissues that consume ATP rapidly, especially skeletal muscle, but also brain and smooth muscle, phosphocreatine serves as an energy reservoir for the rapid regeneration of ATP. Thus<unk>  is an important enzyme in such tissues.
Clinically,<unk>  is assayed in blood tests as a marker of myocardial infarction (heart attack), rhabdomyolysis (severe muscle breakdown), muscular dystrophy and in acute renal failure.
There are three different isoenzymes that come from three distinct locations in the body:
BB: Brain, prostate, gastrointestinal, breast, ovary, lung
MM: Skeletal muscle
MB: Heart
Creatine kinase
Troponin T
Troponin I
Troponin
Amylase
Aspartate transaminase
Lipase
Gamma-glutamyl transpeptidase