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Behavior of rat liver catalase during electrophoresis in a pH gradient.

摘要:

Investigations were conducted on the distribution of rat liver catalase subsequent to electrofocusing in a pH gradient. Differences were observed depending on the enzyme being extracted from the total mitochondrial fraction, from the supernatant of the homogenate or from purified peroxisomes. Catalase solubilized from the total mitochondrial fraction exhibits an apparent isoelectric point lower than that of catalase derived from the supernatant. Catalase released from purified peroxisomes shows a behavior similar to that of the supernatant catalase. It has been concluded that, in a total mitochondrial fraction, a factor is present that alters the electric charge of the catalase molecule during or after the extraction of the enzyme. This factor is probably associated with lysosomes existing together with peroxisomes and mitochondria in a total mitochondrial fraction. As a matter of fact, the addition of an extract of purified lysosomes to purified peroxisomes or to supernatant will cause a shift towards a more acid pH of catalase distribution subsequent to electrofocalization.

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