PMID: 15377275Sep 21, 2004Paper

H2O2-induced inhibition of photosynthetic O2 evolution by Anabaena variabilis cells

Biochemistry. Biokhimii︠a︡
V D SamuilovD B Bezryadnov

Abstract

Hydrogen peroxide inhibits photosynthetic O2 evolution. It has been shown that H2O2 destroys the function of the oxygen-evolving complex (OEC) in some chloroplast and Photosystem (PS) II preparations causing release of manganese from the OEC. In other preparations, H2O2 did not cause or caused only insignificant release of manganese. In this work, we tested the effect of H2O2 on the photosynthetic electron transfer and the state of OEC manganese in a native system (intact cells of the cyanobacterium Anabaena variabilis). According to EPR spectroscopy data, H2O2 caused an increase in the level of photooxidation of P700, the reaction centers of PS I, and decreased the rate of their subsequent reduction in the dark by a factor larger than four. Combined effect of H2O2, CN-, and EDTA caused more than eight- to ninefold suppression of the dark reduction of P700+. EPR spectroscopy revealed that the content of free (or loosely bound) Mn2+ in washed cyanobacterial cells was ~20% of the total manganese pool. This content remained unchanged upon the addition of CN- and increased to 25-30% after addition of H2O2. The content of the total manganese decreased to 35% after the treatment of the cells with EDTA. The level of the H2O2-induced r...Continue Reading

Citations

Apr 6, 2005·Biochemistry. Biokhimii︠a︡·V D Samuilov
Mar 1, 2006·Applied Microbiology and Biotechnology·Bing-kun SunHajime Unno
Apr 18, 2006·Biochemistry. Biokhimii︠a︡·V D SamuilovA V Nesov
Aug 16, 2016·Environmental Science and Pollution Research International·Theodoti PapadimitriouChrysi Laspidou
Aug 19, 2008·Biochemistry. Biokhimii︠a︡·V D SamuilovA A Shestak
Feb 6, 2009·Environmental Science & Technology·Dani J Barrington, Anas Ghadouani

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