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• W1990547652 endingPage "7344" @default.
• W1990547652 startingPage "7339" @default.
• W1990547652 abstract "The PsaF-deficient mutant 3bF of Chlamydomonas reinhardtii was used to modify PsaF by nuclear transformation and site-directed mutagenesis. Four lysine residues in the N-terminal domain of PsaF, which have been postulated to form the positively charged face of a putative amphipathic α-helical structure were altered to K12P, K16Q, K23Q, and K30Q. The interactions between plastocyanin (pc) or cytochrome c 6 (cyt c 6 ) and photosystem I (PSI) isolated from wild type and the different mutants were analyzed using crosslinking techniques and flash absorption spectroscopy. The K23Q change drastically affected crosslinking of pc to PSI and electron transfer from pc and cyt c 6 to PSI. The corresponding second order rate constants for binding of pc and cyt c 6 were reduced by a factor of 13 and 7, respectively. Smaller effects were observed for mutations K16Q and K30Q, whereas in K12P the binding was not changed relative to wild type. None of the mutations affected the half-life of the microsecond electron transfer performed within the intermolecular complex between the donors and PSI. The fact that these single amino acid changes within the N-terminal domain of PsaF have different effects on the electron transfer rate constants and dissociation constants for both electron donors suggests the existence of a rather precise recognition site for pc and cyt c 6 that leads to the stabilization of the final electron transfer complex through electrostatic interactions." @default.
• W1990547652 created "2016-06-24" @default.
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• W1990547652 date "1998-06-23" @default.
• W1990547652 modified "2023-10-16" @default.
• W1990547652 title "The N-terminal domain of PsaF: Precise recognition site for binding and fast electron transfer from cytochrome<i>c</i>₆and plastocyanin to photosystem I of<i>Chlamydomonas reinhardtii</i>" @default.
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• W1990547652 doi "https://doi.org/10.1073/pnas.95.13.7339" @default.
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