THE OXYGEN-EVOLVING COMPLEX REQUIRES CHLORIDE TO PREVENT HYDROGEN-PEROXIDE FORMATION

被引:62
作者
FINE, PL [1 ]
FRASCH, WD [1 ]
机构
[1] ARIZONA STATE UNIV,DEPT BOT,CTR STUDY EARLY EVENTS PHOTOSYNTH,TEMPE,AZ 85287
关键词
D O I
10.1021/bi00163a033
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
Illumination of PSII core preparations can cause the production of H2O2 at rates which approach 60 mumol of H2O2 (mg of Chl-h)-1. The rate of peroxide production is maximal at pH 7.2 at low sucrose concentrations and at concentrations of Cl- (1.5-3.0 mM) that limit the rate of the oxidation of water to O2. The rate of H2O2 production increased with pH from pH 6.8 to 7.2 and was inversely proportional to the oxidation of water to O2 from pH 6.8 to 7.5. While EDTA does not inhibit H2O2 production, this reaction is abolished by 5 mM NH2OH and inhibited by the same concentrations of NH3 that affect water oxidation which indicates that the oxygen-evolving complex is responsible for the production of peroxide generated upon illumination of PSII core preparations. These results support a mechanism in which bound Cl- in the S2 state is displaced by OH- ions which are then oxidized by the OEC to form H2O2. Thus, the OEC requires Cl- to prevent access to the active site of the OEC until four oxidizing equivalents can be generated to allow the oxidation of water to O2.
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页码:12204 / 12210
页数:7
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