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- W2023284778 abstract "A mutant strain of Chlamydomonas reinhardi, ac-206, lacks cytochrome 553, at least in an active and detectable form. Chloroplast fragments of this mutant strain are inactive in the photoreduction of NADP when the source of electrons is water, but they are active when the electron source is 2,6-dichlorophenolindophenol and ascorbate. The addition of either cytochrome 553 or plastocyanin, obtained from the wild-type strain, has no effect upon the photosynthetic activities of the mutant strain. Cells of the mutant strain lack both the soluble and insoluble forms of cytochrome 553, but they possess the mitochondrial type cytochrome c. Thus, the loss of cytochrome 553 appears to be specific.Another mutant strain, ac-208, lacks plastocyanin, or possesses it in an inactive and undetectable form. Chloroplast fragments of ac-208 are inactive in the photoreduction of NADP with either water or 2,6-dichlorophenolindophenol and ascorbate as electron donors. However, these reactions are restored upon the addition of plastocyanin. The addition of cytochrome 553 has no effect. The measurement of light-induced absorbance changes with ac-208 reveal that, in the absence of plastocyanin, light fails to sensitize the oxidation of cytochrome 553, but it will sensitize its reduction. However, the addition of plastocyanin restores the light-induced cytochrome oxidation.A third mutant strain, ac-208 (sup.) carries a suppressor mutation that partially restores the wild phenotype. This mutant strain appears to possess a plastocyanin that is less stable than that of the wild-type strain.The observations with the mutant strains are discussed in terms of the sequence of electron transport System II --> cytochrome 553 --> plastocyanin --> System I." @default.
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- W2023284778 date "1966-12-01" @default.
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- W2023284778 title "Photosynthetic Electron Transport Chain of <i>Chlamydomonas reinhardi</i> VI. Electron Transport in Mutant Strains Lacking Either Cytochrome 553 or Plastocyanin" @default.
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- W2023284778 doi "https://doi.org/10.1104/pp.41.10.1648" @default.
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