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• W2007374416 endingPage "2035" @default.
• W2007374416 startingPage "2029" @default.
• W2007374416 abstract "The PsaC subunit of photosystem I (PS I) binds two [4Fe-4S] clusters, FA and FB, functioning as electron carriers between FX and soluble ferredoxin. To resolve the issue whether FA or FB is proximal to FX, we used single-turnover flashes to promote step-by-step electron transfer between electron carriers in control (both FA and FB present) and HgCl2-treated (FB-less) PS I complexes from Synechococcus sp. PCC 6301 and analyzed the kinetics of P700+ reduction by monitoring the absorbance changes at 832 nm in the presence of a fast electron donor (phenazine methosulfate (PMS)). In control PS I complexes exogenously added ferredoxin, or flavodoxin could be photoreduced on each flash, thus allowing P700+ to be reduced from PMS. In FB-less complexes, both in the presence and in the absence of ferredoxin or flavodoxin, P700+ was reduced from PMS only on the first flash and was reduced from FX− on the following flashes, indicating lack of electron transfer to ferredoxin or flavodoxin. In the FB-less complexes, a normal level of P700 photooxidation was detected accompanied by a high yield of charge recombination between P700+ and FA− in the presence of a slow donor, 2,6-dichlorophenol-indophenol. This recombination remained the only pathway of FA− reoxidation in the presence of added ferredoxin, consistent with the lack of forward electron transfer. FA− could be reoxidized by methyl viologen in FB-less PS I complexes, although at a concentration two orders of magnitude higher than is required in wild-type PS I complexes, thus implying the presence of a diffusion barrier. The inhibition of electron transfer to ferredoxin and flavodoxin was completely reversed after reconstituting the FB cluster. Using rate versus distance estimates for electron transfer rates from FX to ferredoxin for two possible orientations of PsaC, we conclude that the kinetic data are best compatible with PsaC being oriented with FA as the cluster proximal to FX and FB as the distal cluster that donates electrons to ferredoxin." @default.
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• W2007374416 date "1998-04-01" @default.
• W2007374416 modified "2023-09-24" @default.
• W2007374416 title "PsaC Subunit of Photosystem I Is Oriented with Iron-Sulfur Cluster FB as the Immediate Electron Donor to Ferredoxin and Flavodoxin" @default.
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• W2007374416 doi "https://doi.org/10.1016/s0006-3495(98)77909-3" @default.
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