1996
DOI: 10.1021/bi951471e
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Binding Dynamics and Electron Transfer between Plastocyanin and Photosystem I

Abstract: The mechanism of the electron transfer from the soluble protein plastocyanin to the multiprotein complex of photosystem I from spinach has been studied in detail. The two kinetic components of P700+ reduction by plastocyanin after a laser flash, showing a constant half-life of 11 microseconds and a variable half-life of the second-order reaction, respectively, are used to monitor the electron transfer from bound and soluble plastocyanin. The effect of increasing concentration of reduced plastocyanin on both of… Show more

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Cited by 137 publications
(216 citation statements)
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“…However, in intact C. reinhardtii, these mutations showed only minor effects on the oxidation kinetics of cyt f after laser-induced oxidation of P700 (29). This difference is not fully understood but may partially be explained by the release of oxidized plastocyanin from PSI being rate-limiting for the oxidation of cyt f (18).…”
Section: Does Tyr-83 Play a Significant Role In The Electronmentioning
confidence: 97%
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“…However, in intact C. reinhardtii, these mutations showed only minor effects on the oxidation kinetics of cyt f after laser-induced oxidation of P700 (29). This difference is not fully understood but may partially be explained by the release of oxidized plastocyanin from PSI being rate-limiting for the oxidation of cyt f (18).…”
Section: Does Tyr-83 Play a Significant Role In The Electronmentioning
confidence: 97%
“…Subsequent mutations within the PsaF domain in Chlamydomonas reinhardtii uncovered the importance of a single Lys residue (17). The electron transfer from plastocyanin to PSI involves a fast and tight binding of reduced plastocyanin and a considerably weaker binding of oxidized plastocyanin, which is released from PSI after the electron transfer to P700 in a step that is rate-limiting for the oxidation of cyt f (18).…”
mentioning
confidence: 99%
“…Electron transfer between pc or cyt c 6 and the eukaryotic PSI can be described by a multistep model of donor binding, PSIdonor complex formation, electron transfer, and donor unbinding (6,7). In eukaryotic organisms, binding of pc or cyt c 6 to the PSI is mainly driven by two different forces, electrostatic attraction and hydrophobic contact.…”
mentioning
confidence: 99%
“…In eukaryotic organisms, binding of pc or cyt c 6 to the PSI is mainly driven by two different forces, electrostatic attraction and hydrophobic contact. Long range electrostatic attractions between basic patches of PsaF and acidic regions of pc and cyt c 6 (8 -12) as well as the hydrophobic contact between the electron transfer site of the donors and PSI, including PsaATrp 651 and PsaB-Trp 627 in C. reinhardtii (9,13), are required for stable electron transfer complex formation and efficient electron transfer.…”
mentioning
confidence: 99%
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