Peculiarities of Mn(II) cation oxidation in the photosystem II without oxygen-evolving complex. Evolutionary aspect
Abstract
One of the main reactions in the process of the light energy transformation in oxygenic organisms is the extraction of electrons from water, which are necessary for the light stage of photosynthesis. The light-dependent oxidation of water is carried out by an oxygen-evolving complex (OEC), the catalytic center of which is the cluster Mn4CaO5. OEC is located in photosystem II (PSII) on the lumen side of thylakoid membrane. The evolutionary origin of the PSII is unclear, as is the origin of the manganese cluster in the OEC. Recently, Johnson et al. (2013) suggested that in the primary PSII in the Archean period, the cluster Mn4CaO5 was absent, and PSII oxidized not water, but Mn(II) cations, i.e., manganese cations were the source of electrons. In the presented work, we investigated the possibility of the influence of some environmental factors (citrate and hydrogen peroxide) on the oxidation rate of Mn(II) cations by a PSII that does not contain OEC. We found that citrate inhibit the oxidation of Mn(II) cations binding them but doesn’t extract Mn cations from OEC. Hydrogen peroxide, on the contrary, significantly increases the oxidation rate of manganese (from 28±2 to 145±7 μmol 2,6-dichlorophenolindophenol mg Chl-1 h-1 in the presence of H2O2). Such effects should be taken into account when investigating the oxidation of manganese cations by the photosystem as a possible source of electrons in the early stages of evolution.
Keywords
evolution of photosystems,
photosystem II,
oxygen-evolving complex,
manganese, citrate,
hydrogen peroxide
Supporting agencies: The research was carried out as part of the Scientific Project of the State Order of the Government of Russian Federation to Lomonosov Moscow State University No. 121032500058-7
About the Authors
E. R. Lovyagina
Department of Biophysics, School of Biology, Lomonosov Moscow State University
Russian Federation
Russian Federation
1–12 Leninskie gory, Moscow, 119234, Russia
L. N. Davletshina
Department of Biophysics, School of Biology, Lomonosov Moscow State University
Russian Federation
Russian Federation
1–12 Leninskie gory, Moscow, 119234, Russia
B. K. Semin
Department of Biophysics, School of Biology, Lomonosov Moscow State University
Russian Federation
Russian Federation
1–12 Leninskie gory, Moscow, 119234, Russia
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Review
For citations:
Lovyagina E.R., Davletshina L.N., Semin B.K. Peculiarities of Mn(II) cation oxidation in the photosystem II without oxygen-evolving complex. Evolutionary aspect. Vestnik Moskovskogo universiteta. Seriya 16. Biologiya. 2022;77(2):98–103. (In Russ.)
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