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• W2122720505 endingPage "3439" @default.
• W2122720505 startingPage "3429" @default.
• W2122720505 abstract "Reaction centers of photosystem I contain three different [4Fe-4S] clusters named FX, FA, and FB. The terminal photosystem I acceptors (FA, FB) are distributed asymmetrically along the membrane normal, with one of them (FA or FB) being reduced from FX and the other one (FB or FA) reducing soluble ferredoxin. In the present work, kinetics of electron transfer has been measured in PSI from the cyanobacterium Synechocystis sp. PCC 6803 after inactivation of FB by treatment with HgCl2. Photovoltage measurements indicate that, in the absence of FB, reduction of FA by FX is still faster than the rate of FX reduction [(210 ns)-1]. Flash-absorption measurements show that the affinity of ferredoxin for HgCl2-treated PSI is only decreased by a factor of 3−4 compared to untreated photosystem I. The first-order rate of ferredoxin reduction by FA-, within the photosystem I/ferredoxin complex, has been calculated from measurements of P700+ decay. Compared to control PSI, this rate is several orders of magnitude smaller (6 s-1 versus 104−106 s-1). Moreover, it is smaller than the rate of recombination from FA-, resulting in inefficient ferredoxin reduction (yield of 25%). After reconstitution of FB, about half of the reconstituted photosystem I reaction centers recover fast reduction of ferredoxin with kinetics similar to that of untreated photosystem I. These results support FB as the direct partner of ferredoxin and as the more distal cluster of photosystem I with respect to the thylakoid membrane, in accordance with a linear electron-transfer pathway FX → FA → FB → ferredoxin." @default.
• W2122720505 created "2016-06-24" @default.
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• W2122720505 date "1998-02-20" @default.
• W2122720505 modified "2023-10-18" @default.
• W2122720505 title "Electron Transfer in Photosystem I Reaction Centers Follows a Linear Pathway in Which Iron−Sulfur Cluster F_B Is the Immediate Electron Donor to Soluble Ferredoxin" @default.
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• W2122720505 doi "https://doi.org/10.1021/bi972469l" @default.
• W2122720505 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9521664" @default.
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