Abstract
1. 1. Rat liver was fractionated into peroxisomes and mitochondria and branched-chain keto acid (BCKA) dehydrogenase activity was measured. 2. 2. All BCKA dehydrogenase activity was associated with the mitochondrial fraction and none with the peroxisomal fraction. 3. 3. BCKA dehydrogenase was also not detected in hepatic peroxisomes of rats treated with clofibrate which induces several peroxisomal enzymes. 4. 4. Hepatic peroxisomes from rabbit, hamster and dog also did not show any BCKA dehydrogenase activity. 5. 5. We conclude that mammalian hepatic peroxisomes do not contain BCKA dehydrogenase.
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