Abstract
Rat hindlimb muscle tissue was extracted from male Sprague-Dawley rats exsanguinated under light ether anesthesia. Muscle homogenates (50, 000 × g supernatant) were incubated with ATP, bicarbonate, acetyl-CoA, and citrate. The quantity of malonyl-CoA synthesized was determined by malonyl-CoA incorporation into long acyl chains using tritiated acetyl-CoA and fatty acid synthetase. Malonyl-CoA synthesis was found to be dependent on the presence of ATP, bicarbonate, citrate, and acetyl-CoA in the incubation medium. Incubation with avidin showed near complete inhibition of carboxylation that was restored with the addition of biotin. These results represent strong evidence of a biotin containing acetyl-CoA carboxylase in skeletal muscle.
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