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分离的光系统II反应中心核心复合物中的光化学

Photochemistry in the isolated Photosystem II reaction-centre core complex.

作者信息

Demetriou C, Lockett C J, Nugent J H

机构信息

Department of Biology, University College London, U.K.

出版信息

Biochem J. 1988 Jun 15;252(3):921-4. doi: 10.1042/bj2520921.

DOI:10.1042/bj2520921
PMID:2844160
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC1149238/
Abstract

The photochemistry of the isolated Photosystem II reaction-centre core from pea and the green alga Scenedesmus was examined by e.s.r. Two types of triplet spectrum were observed in addition to the spin-polarized reaction-centre triplet previously identified. The additional triplet formed on continuous illumination at 4.2 K was attributed to a monomeric phaeophytin molecule. The second triplet, which was stable in the dark at 4.2 K following illumination, was assigned to the radical pair Donor+I-. This provides evidence that an electron donor to chlorophyll P680 is present on the polypeptide D1-polypeptide D2-cytochrome b-559 core complex.

摘要

通过电子自旋共振（e.s.r.）研究了从豌豆和绿藻栅藻中分离出的光系统II反应中心核心的光化学性质。除了先前鉴定出的自旋极化反应中心三重态外，还观察到两种类型的三重态光谱。在4.2 K持续光照下形成的额外三重态归因于单体脱镁叶绿素分子。第二个三重态在光照后于4.2 K黑暗中稳定，被指定为自由基对供体 +I-。这提供了证据，表明在多肽D1 - 多肽D2 - 细胞色素b - 559核心复合物上存在叶绿素P680的电子供体。

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本文引用的文献

1
Presence in Photosystem II Core Complexes of a 34-Kilodalton Polypeptide Required for Water Photolysis.存在于光系统 II 核心复合物中的一个 34 千道尔顿的多肽对于水的光解是必需的。
Plant Physiol. 1984 Nov;76(3):829-32. doi: 10.1104/pp.76.3.829.
2
Isolation of a photosystem II reaction center consisting of D-1 and D-2 polypeptides and cytochrome b-559.分离含有 D-1 和 D-2 多肽以及细胞色素 b-559 的光系统 II 反应中心。
Proc Natl Acad Sci U S A. 1987 Jan;84(1):109-12. doi: 10.1073/pnas.84.1.109.
3
Radical pair state in photosystem II.光合作用系统 II 中的自由基对态。
Proc Natl Acad Sci U S A. 1982 Dec;79(23):7283-7. doi: 10.1073/pnas.79.23.7283.
4
The triplet state in bacterial photosynthesis: Possible mechanisms of the primary photo-act.细菌光合作用中的三重态：初级光反应的可能机制。
Proc Natl Acad Sci U S A. 1975 Sep;72(9):3270-4. doi: 10.1073/pnas.72.9.3270.
5
Reaction center triplet states in photosystem I and photosystem II.光系统I和光系统II中的反应中心三线态
Biochim Biophys Acta. 1981 Apr 13;635(2):225-35. doi: 10.1016/0005-2728(81)90022-0.
6
A light-induced spin-polarized triplet detected by EPR in photosystem II reaction centers.通过电子顺磁共振在光系统II反应中心检测到的光诱导自旋极化三重态。
Biochim Biophys Acta. 1981 Apr 13;635(2):205-14. doi: 10.1016/0005-2728(81)90020-7.
7
Tyrosine radicals are involved in the photosynthetic oxygen-evolving system.酪氨酸自由基参与光合放氧系统。
Proc Natl Acad Sci U S A. 1987 Oct;84(20):7099-103. doi: 10.1073/pnas.84.20.7099.
8
Site-directed mutagenesis identifies a tyrosine radical involved in the photosynthetic oxygen-evolving system.定点诱变鉴定出参与光合放氧系统的一个酪氨酸自由基。
Proc Natl Acad Sci U S A. 1988 Jan;85(2):427-30. doi: 10.1073/pnas.85.2.427.
9
Triplet states in photosystem I of spinach chloroplasts and subchloroplast particles.菠菜叶绿体和亚叶绿体颗粒光系统I中的三重态
Proc Natl Acad Sci U S A. 1979 Oct;76(10):5124-8. doi: 10.1073/pnas.76.10.5124.

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