Studies on the Metabolism of Unsaturated Fatty Acids. XV. Purification and Properties of 2,4-Dienoyl-CoA Reductase from Rat Liver Peroxisomes1

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Peroxisomal 2,4-dienoyl-CoA reductase was purified from rat liver to homogeneity. The subunit molecular weight of 33,000 was determined by sodium dodecyl sulfatepolyacrylamide gel electrophoresis. The native molecular weight close to 120,000 was estimated by gel filtration on Sephacryl S-300 Superfine. trans-2, trans-4-Decadienoyl-CoA was the most active substrate among the dienoyl-CoA's of various chain lengths. The total activity of peroxisomal 2,4-dienoyl-CoA reductase exceeded that of the mitochondrial one even in the livers of rats fed with a standard diet. Furthermore both reductases were remarkably and coordinately induced in the livers of clofibrate-treated rats.

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