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The Psb.2 Protein Aids in Repairing Photodamaged Photosystem II in the Cyanob.cterium Synechocystis 6803

Molecular Plant 2011年第6期4卷 1052-1061页

作者： Kimb.rly M. Wegener Stefan b.nnewitz Ralf Oelmuller himadri b. pakrasi Department of b.ology Washington University St Louis MO 63130 USA Present address： Division of b.ological Sciences University of Missouri Columbia MO 65211 USA Institute of Plant Physiology Friedrich-Schiller-University Jena Dornburger Str. 159 D-07743 Jena Germany

Photosystem II （PSII）, a memb.ane protein complex, catalyzes the photochemical oxidation of water to molecular oxygen. This enzyme complex consists of approximately 20 stoichiometric protein components. However, due to the highly energetic reactions it catalyzes as part of its normal activity, PSII is continuously damaged and repaired. With advances in protein detection technologies, an increasing numb.r of sub.stoichiometric PSII proteins have b.en identified, many of which aid in the b.ogenesis and assemb.y of this protein complex. Psb.2 （SII1390） has previously b.en identified as a protein associated with highly active purified PSII preparations from the cyanob.cterium Synechocystis sp. PCC 6803. To investigate its function, the sub.ellular localization of Psb.2 and the impact of deletion of the psb.2 gene on PSII were analyzed. Here, we show that Psb.2 is an integral memb.ane protein, primarily located in the thylakoid memb.anes. Al- though not required for cell viab.lity, Psb.2 protects cells from oxidative stress and additionally confers a selective fitness advantage in mixed culture experiments. Specifically, Psb.2 protects PSII from photodamage and accelerates its repair. Thus, the data suggest that Psb.2 plays an important role in minimizing the effect of photoinhib.tion on PSII.

关键词： Photosynthesis reactive oxygen species photoinhib.tion photodamage.

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