Effect of trehalose on oxygen evolution and electron transfer in photosystem 2 complexes

Biochemistry. Biokhimii︠a︡
Mahir D MamedovA Yu Semenov

Abstract

The pigment-protein complex of photosystem 2 (PS 2) catalyzes the light-driven oxidation of water molecule and the reduction of plastoquinone. In this work, we studied the effect of the disaccharide trehalose, which is unique in its physicochemical properties, on isolated PS 2 complex. It was found that trehalose significantly stimulated the steady-state rate of oxygen evolution. The study of single flash-induced fluorescence decay kinetics demonstrated that trehalose did not affect the rate of QA(-) oxidation, although it led to an increase in the relative fractions of PS 2 reaction centers capable of QA(-) oxidation. Trehalose also prevented PS 2 complexes from being inactivated on prolonged storage. We propose that in the presence of trehalose, which affects the extent of hydration, the protein can preferentially exist in a more optimal conformation for effective functioning.

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Citations

Sep 21, 2015·Journal of Photochemistry and Photobiology. B, Biology·D V YanykinV V Klimov
Oct 26, 2016·Journal of Photochemistry and Photobiology. B, Biology·D V YanykinV V Klimov
Sep 5, 2020·Critical Reviews in Biochemistry and Molecular Biology·Michael GorkaJohn H Golbeck
Nov 16, 2020·Journal of Bioenergetics and Biomembranes·Andrey A ZaspaMahir D Mamedov
May 5, 2021·Biochemistry. Biokhimii︠a︡·Tatiana Yu Fufina, Lyudmila G Vasilieva

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