Abstract
The formation of creatine phosphate by isolated rabbit heart mitochondria in the presence of creatine, α-ketoglutarate, ATP, and inorganic phosphate was studied. Creatine phosphate formation was inhibited by oligomycin. This was most probably due to increased concentration of ADP favoring the reverse reaction (formation of creatine and ATP from phosphocreatine and ADP). The inhibitory effect of oligomycin disappeared in the presence of phosphoenolpyruvate and pyruvate kinase. The results do not indicate any direct coupling between mitochondrial creatine phosphokinase and ATP-ADP translocase as has been suggested for rat heart mitochondria.
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