Studies on Superoxide Formation in Photosystem Ⅱ with a Novel Spin Trap

Abstract

Abstract: Under strong illumination, photosystem Ⅱ (PS Ⅱ )of higher plant was active in superoxide production.However, it keeps unclear about the mechanisms and sites of superoxide formation by PS Ⅱ .Concerning above questions, the molecular mechanisms of superoxide formation by PS IIfrom spinach in this work has been studied.The site range for possible superoxide formation by PS Ihas been constricted by the study on the donor or acceptor inhibited PS Ipreparation.The results indicated that the plasto-quinones located at Q_A and Q_B of PS Ⅱ was the primary site responsible for superoxide formation.

Key words: Superoxide anion radical, Photosystem Ⅱ, Reactive oxygen species, Spin trapping-ESR

CLC Number:

O945.11

TrendMD:

SUN Jian, LIU Ke, XU Ying-Kai, CHEN Zhong-Wei, LIU Yang. Studies on Superoxide Formation in Photosystem Ⅱ with a Novel Spin Trap[J]. Chem. J. Chinese Universities, 2002, 23(5): 979.

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Studies on Superoxide Formation in Photosystem Ⅱ with a Novel Spin Trap

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