Studies on peroxisomes. VI. Relationship between the peroxisomal core and urate oxidase.:VI. Relationship between the Peroxisomal Core and Urate Oxidase

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The peroxisomal core from the liver of rats was purified 450-fold as a marker of urate oxidase [EC 1. 7. 3. 3] activity. This preparation had a high specific activity of urate oxidase but not of other peroxisomal enzymes: D-amino acid oxidase [EC 1.4.3.3], L-α-hydroxy acid oxidase [EC 1.1.3.15], or catalase [EC 1. 11. 1.6]. No activity of marker enzymes for other subcellular particles; cytochrome c oxidase [EC 1.9.3. 1] (mitochondria), acid phosphatase [EC 3.1. 3.2] (lysosomes), or glucose-6-phosphatase [EC 3.1.3.9] (microsomes), was detected in this preparation.<br> The core obtained showed a single protein band in sodium dodecyl sulfate-poly-acrylamide gel electrophoresis and the position of the band was found to correspond to a molecular weight of about 35, 000, When the peroxisomal core was subjected to treatment at various pH's with 0.1M carbonate buffer, urate oxidase was almost completely solubilized at pH 11.0, although approximately 35% of the core protein still remained in the pellet. After solubilization of the core at pH 11.0, the specific activity of urate oxidase in the supernatant increased about 1.6 times ; the density of the insoluble protein remaining in the pellet was identical with that of the original core on sucrose density gradient centrifugation.

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