FUNCTION: REVERSIBLY CATALYZES THE TRANSFER OF PHOSPHATE BETWEEN ATP AND VARIOUS PHOSPHOGENS (E.G. CREATINE PHOSPHATE). CREATINE KINASE ISOENZYMES PLAY A CENTRAL ROLE IN ENERGY TRANSDUCTION IN TISSUES WITH LARGE, FLUCTUATING ENERGY DEMANDS, SUCH AS SKELETAL MUSCLE, HEART, BRAIN, AND SPERMATOZOA. * CATALYTIC ACTIVITY: ATP + creatine = ADP + phosphocreatine. * SUBUNIT: DIMER OF IDENTICAL OR NONIDENTICAL CHAINS. WITH MM BEING THE MAJOR FORM IN SKELETAL MUSCLE AND MYOCARDIUM, MB EXISTING IN MYOCARDIUM, AND BB EXISTING IN MANY TISSUES, ESPECIALLY BRAIN. * SUBCELLULAR LOCATION: Cytoplasmic. * SIMILARITY: BELONGS TO THE ATP:GUANIDO PHOSPHOTRANSFERASE FAMILY. |
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22-SEP-00
Last Update 13-Mar-03