FEBS Letters | |
The relation between the electron spin polarization of the donor triplet state of the photosynthetic reaction center from Rhodopseudomonas viridis and the redox state of the primary acceptor | |
Gast, P.1  Schaafsma, T.J.1  van Wijk, F.G.H.1  | |
[1] Agricultural University, Laboratory of Molecular Physics, De Dreijen 11, 6703 BC Wageningen, The Netherlands | |
关键词: Triplet state electron spin polarization; Bacterial photosynthesis; EPR; Reaction cente; Redox state; | |
DOI : 10.1016/0014-5793(86)80988-7 | |
学科分类:生物化学/生物物理 | |
来源: John Wiley & Sons Ltd. | |
【 摘 要 】
The hypothesis [(1986) Photobiochem. Photobiophys. 11, 95-100] that the temperature dependence of the electron spin polarization (ESP) pattern of the Δm = ± 1 EPR spectrum of the triplet state PR of the Rhodopseudomonas viridis reaction center is caused by magnetic interaction between the reduced menaquinone-iron complex Q−Fe2+ and the electron spin on I− (reduced bacteriopheophytin b), which is part of the radical pair P+I− (P+ is the oxidized primary electron donor P960) has been investigated. It was found that the AEAEAE ESP pattern of the EPR spectrum detected at T > 20 K changes into the usual AEEAAE pattern, when Q−Fe2+ is photochemically converted into Q2−Fe2+. This demonstrates that the presence of Q− in Q−Fe2+ is a necessary condition to obtain the AEAEAE ESP pattern.
【 授权许可】
Unknown
【 预 览 】
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