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Ferredoxin from the cyanobacterium Anacystis nidulans becomes photoreduced when irradiated with visible light in the presence of 5-deazariboflavin as photocatalyst and ethylenediaminetetraacetate as oxidizable substrate. A nitrate-photoreducing system which utilizes photochemically reduced ferredoxin as electron donor for the reduction of nitrate catalyzed by the ferredoxin/nitrate reductase of A. nidulans has been developed. Neither flavin nucleotides nor viologens can replace ferredoxin as electron carrier in this system. 5-Deazariboflavin has a greater efficiency as photocatalyst than FMN, FAD, lumiflavin or riboflavin. The role of flavins as energy-transducing redox photosystems and their potential for solar energy conversion are considered.
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Candau et al. (1980) studied this question.
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