Participation of ferredoxin in oxygen reduction by the photosynthetic electron transport chain |
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Authors: | M A Kozuleva I A Naidov M M Mubarakshina B N Ivanov |
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Institution: | (1) Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia |
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Abstract: | Oxygen reduction by isolated pea thylakoids was studied in the presence of ferredoxin (Fd), Fd + NADP, and cytochrome c. At Fd concentrations optimal for NADP reduction, it contributed 30–50% of the reducing equivalents (as deduced by comparing the rates of oxygen reduction and light oxidation of reduced Fd). The oxygen reduction rate in the presence of Fd + NADP was 3–4 times lower than with Fd alone, and comparable to that with cyt c. It is supposed that the process involves a photosystem I component whose reaction with oxygen depends on the rate of electron efflux from the PS I terminal acceptors, and that this component is phylloquinone. |
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Keywords: | photosynthesis thylakoid membrane photosystem I O2 reduction ferredoxin phylloquinone |
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