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Reaction pattern of Photosystem II: oxidative water cleavage and protein flexibility
Authors:Philipp Kühn  Jörg Pieper  Olga Kaminskaya  Hann-Jörg Eckert  Ruep E. Lechner  Vladimir Shuvalov  Gernot Renger
Affiliation:(1) Max-Volmer-Laboratorium für Biophysikalische Chemie, Technische Universität Berlin, Straße des 17. Juni 135, 10623 Berlin, Germany;(2) Hahn-Meitner-Institut, Glienicker Str. 100, 14109 Berlin, Germany;(3) RAS, Institute of Basic Biological Problems, Pushchino, Moscow Region, Russia
Abstract:This short communication addresses three topics of photosynthetic water cleavage in Photosystem II (PS II): (a) effect of protonation in the acidic range on the extent of the ‘fast’ ns kinetics of P680 reduction by YZ, (b) mechanism of O–O bond formation and (c) role of protein flexibility in the functional integrity of PS II. Based on measurements of light-induced absorption changes and quasielastic neutron scattering in combination with mechanistic considerations, evidence is presented for the protein acting as a functionally active constituent of the water cleavage machinery, in particular, for directed local proton transfer. A specific flexibility emerging above a threshold of about 230 K is an indispensable prerequisite for oxygen evolution and plastoquinol formation.
Keywords:cytochrome b559  neutron scattering  P680  Photosystem II  protein flexibility  water cleavage
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