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 (Probable). Acts as a key regulator of adaptive thermogenesis as part of the futile creatine cycle: localizes to the mitochondria of thermogenic fat cells and acts by mediating phosphorylation of creatine to initiate a futile cycle of creatine phosphorylation and dephosphorylation (By similarity). During the futile creatine cycle, creatine and N-phosphocreatine are in a futile cycle, which dissipates the high energy charge of N-phosphocreatine as heat without performing any mechanical or chemical work (By similarity).
Cytoplasm, cytosol . Mitochondrion . Localizes to the mitochondria of thermogenic fat cells via the internal MTS-like signal (iMTS-L) region. .
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