Photosynthetic water oxidation

FEBS Letters

Webber, Andrew N.¹  Spencer, Lee²  Heath, Robert L.²  Sawyer, Donald T.² 

[1] Department of Botany and Plant Sciences, University of California, Riverside, CA 92521, USA;Department of Chemistry, University of California, Riverside, CA 92521, USA

关键词: Photosystem II;    Oxygen evolution mechanism;    Manganese;    Plastoquinone;    Cytochrome;    b559;   

DOI  :  10.1016/0014-5793(85)81035-8

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

A sequential four-step chemical model for the water oxidation process in photosystem II is presented, based on the observation that a peroxide-linked biquinone complex can be chemically formed as a result of hydroxide ion addition to quinone. In our model, the hydroxide ion intermediate is generated in photosystem II as a result of proton abstraction from water. In the model, the first two flashes of light raise the oxidation state of the bimanganese center, while the third and fourth flashes of light sequentially generate the peroxide-linked biquinone which is then directly oxidized by the bimanganese center to produce oxygen and regenerate quinone.

【 授权许可】

Unknown