Is phylloquinone an obligate electron carrier in photosystem I?
- 4 May 1987
- journal article
- research article
- Published by Wiley in FEBS Letters
- Vol. 215 (1), 58-62
- https://doi.org/10.1016/0014-5793(87)80113-8
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 BKeywords
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