STUDIES ON ALGAL CYTOCHROME I. ENZYMIC ACTIVITIES PERTAINING TO PORPHYRA TENERA CYTOCHROME 553 IN CELL-FREE EXTRACTS
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概要
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1. Enzymic activities pertaining to Porphyra tenera cytochrome 553 were investigated with cell-free extracts of a red alga, Porphyra tenera, and various fractions prepared therefrom. 2. The algal extracts were found to be incapable, in the dark, of catalyzing oxidation of reduced cytochrome 553 at a rate sufficient to account for the respiratory oxygen-uptake in the intact cell. Oxidation of cytochrome 553 was highly accelerated on illumination. The former reaction was found to be cyanide-sensitive and the latter, cyanide-insensitive. Both activities were found to be localized in the particulate fraction of the cell extract. 3. Significant activities of reduced pyridine nucleotide-cytochrome reductase were discovered in the soluble fraction of the cell extract, the reaction being two or three times faster with TPNH than with DPNH as electron donor. There was no reaction With succinate in the presence of cytochrome and 2,6-dichlorophenol indophenol. 4. Porphyra tenera cytochrome 553 was shown to be localized in the plastids of the algal cell. 5. Possible functions of cytochrome 553 in the alga] metabolism were discussed.
- 日本植物生理学会の論文
著者
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Katoh Sakae
Department Of Biochemistry Faculty Of Science University Of Tokyo
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Katoh Sakae
Department Of Biphysics Aud Biochemisiry Faculty Of Science University Of Tokyo
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