THE INVOLVEMENT OF PHOTOSYSTEM-II-GENERATED H2O2 IN PHOTOINHIBITION

被引：34
|
作者：
BRADLEY, RL
LONG, KM
FRASCH, WD
机构：
[1] ARIZONA STATE UNIV,DEPT BOT,TEMPE,AZ 85287
[2] ARIZONA STATE UNIV,CTR STUDY EARLY EVENTS PHOTOSYNTH,TEMPE,AZ 85287
来源：
FEBS LETTERS | 1991年 / 286卷 / 1-2期
关键词：
PHOTOSYSTEM-II; D1-PROTEIN; PHOTOINHIBITION; H2O2;
D O I：
10.1016/0014-5793(91)80975-9
中图分类号：
Q5 [生物化学]; Q7 [分子生物学];
学科分类号：
071010 ; 081704 ;
摘要：
The involvement of H2O2 generated by photosystem II (PSII) in the process of photoinhibition of thylakoids with a functional oxygen-evolving complex (OEC) was investigated. The rate of photoinhibition was decreased to the rate of loss of activity in the dark when bovine Fe-catalase was present during the photoinhibitory illumination. Photoinhibition was accelerated for both Cl--depleted and Cl--sufficient thylakoids when KCN was present to inhibit the thylakoid-bound Fe-catalase. We propose that these preparations become photoinhibed by reactions with H2O2 produced via oxidation of water by the Cl--depleted OEC and by reduction of O2 at the Q(B) site when PSII is illuminated without an electron acceptor.
引用
收藏
页码：209 / 213
页数：5
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