Is phylloquinone an obligate electron carrier in photosystem I?

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Abstract

Comparative quantitative analysis of phylloquinone content and photochemically competent P-700 has been performed on photosystem I particles subjected to photolysis with ultraviolet irradiation. Nonirradiated control particles exhibit a phylloquinone/P-700 stoichiometry of 1.9 ± 0.2. Photolysis of the photosystem I particles induces a progressive depletion of phylloquinone, however, photochemistry as assayed at room temperature by the photooxidation of P-700 is unaffected. These data are not consistent with the assignment of phylloquinone as a functional intermediate at room temperature between P-700 and the iron-sulfur clusters, center A and center B. © 1987.

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Palace, G. P., Franke, J. E., & Warden, J. T. (1987). Is phylloquinone an obligate electron carrier in photosystem I? FEBS Letters, 215(1), 58–62. https://doi.org/10.1016/0014-5793(87)80113-8

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