Photosystem I electron transport and phosphorylation supported by electron donation to the plastoquinone region |
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Authors: | S Izawa RL Pan |
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Affiliation: | Department of Biology, Wayne State University Detroit, Michigan 48202 USA |
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Abstract: | In chloroplasts, tetramethyl-p-hydroquinone supports high rates of phosphorylation-coupled, noncyclic electron flow through Photosystem I to methylviologen. The reaction is totally sensitive to dibromothymoquinone, indicating an electron donation to the plastoquinone region of the photosynthetic chain. The uncoupled electron flow rate exceeds 1000 μequivalents per hour per mg chlorophyll. The phosphorylation efficiency () at the optimal pH of 8 is 0.6–0.65. Presumably this ratio represents the efficiency of energy coupling in the electron transfer step plastoquinone → cytochrome f. |
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