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MECHANISM OF PHOTOSYSTEM II OXYGEN EVOLUTION ACTIVITY DECREASE AT ACIDIC pH
Original title
МЕХАНИЗМ СНИЖЕНИЯ КИСЛОРОД-ВЫДЕЛЯЮЩЕЙ АКТИВНОСТИ ФОТОСИСТЕМЫ 2 ПРИ КИСЛЫХ рН
Authors
E.R. Lovyagina, B.K. Semin
Contact information
Federal State Budget Educational Institution of Higher Education M.V. Lomonosov Moscow State University, Moscow, Russia, Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.
Pages
471-474
DOI
10.31255/978-5-94797-319-8-471-474
Abstract
The mechanism of acid pH inhibition effect on the activity of oxygen-evolving complex (OEC) of photosystem II (PSII) membranes preparations was investigated in the presented study. Obtained results demonstrate that incubation of PSII preparations in acid buffer with pH 3.5 – 5.0 provide irreversible dissociation of two extrinsic proteins PsbP and PsbQ and extraction of Ca2+ from the OEC that is accompanied by significant inhibition of OEC efficiency. Activity of OEC can be restored either by the adjusting of pH incubation medium to optimum values (pH 6.4 – 6.5) in the presence of extrinsic proteins PsbP and PsbQ or by addition of exogenous Ca2+ cation at optimal pH.