Abstract
Ca-depleted photosystem II membranes obtained by treatment with acidic buffer do not contain Ca2+ in the Mn4CaO5 cluster but contain all extrinsic proteins protecting this cluster (PSII(-Ca/low pH)). However, unlike native photosystem II, Mn cluster in PSII(-Ca/low pH) samples is available for small-sized reductants. Using this property, we investigated the substitution possibility of Mn cation(s) with Fe cation(s) to obtain a chimeric cluster in PSII(-Ca/low pH) samples containing extrinsic proteins. We found that Fe(II) cation replaces Mn cation at pH 6.5, however, PSII(-Ca/low pH) membranes with the 3Mn1Fe chimeric cluster in the oxygen-evolving complex evolve O2 with high intensity in the presence of exogenous Ca2+. The O2 evolution rate is about 80% of the same rate in PSII(-Ca/low pH) membranes.
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Data availability
The data that support the findings of this study are available from the corresponding author, [BS], upon reasonable request.
Abbreviations
- Chl:
-
Chlorophyll
- DCBQ:
-
2,6-Dichloro-1,4-benzoquinone
- HA:
-
High-affinity Mn-binding site
- H2Q:
-
Hydroquinone
- MES:
-
2-(N-morpholino)-ethanesulfonic acid
- OEC:
-
Oxygen-evolving complex
- PSII:
-
Photosystem II
- PSII(-Ca):
-
Ca-depleted PSII
- PSII(-Ca/low pH):
-
Ca-depleted PSII membranes using low pH treatment
- PSII(-Ca/NaCl):
-
Ca-depleted PSII membranes using NaCl treatment
- PSII(-Ca/low pH/3Mn1Fe):
-
Low pH-treated PSII(-Ca) membranes with chimeric cluster 3Mn1Fe
- PSII(-Mn):
-
Mn-depleted PSII membranes
- RC:
-
Reaction center
- TMB:
-
3,3′,5,5′-Tetramethylbenzidine
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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
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Semin, B.К., Davletshina, L.N. High-efficiency oxygen evolution by photosystem II oxygen-evolving complex containing 3Mn per reaction center. J Biol Inorg Chem 28, 393–401 (2023). https://doi.org/10.1007/s00775-023-01987-2
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DOI: https://doi.org/10.1007/s00775-023-01987-2