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A single residue controls electron transfer gating in photosynthetic reaction centers
O. Shlyk, I. Samish, M. Matěnová, A. Dulebo, H. Poláková, D. Kaftan, A. Scherz,
Language English Country England, Great Britain
Document type Journal Article, Research Support, Non-U.S. Gov't
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PubMed
28300167
DOI
10.1038/srep44580
Knihovny.cz E-resources
- MeSH
- Cell Respiration genetics MeSH
- Electrons MeSH
- Photosynthesis genetics MeSH
- Photosystem II Protein Complex chemistry genetics MeSH
- Kinetics MeSH
- Light MeSH
- Light-Harvesting Protein Complexes chemistry genetics MeSH
- Synechocystis chemistry genetics MeSH
- Electron Transport genetics MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
Interquinone QA- → QB electron-transfer (ET) in isolated photosystem II reaction centers (PSII-RC) is protein-gated. The temperature-dependent gating frequency "k" is described by the Eyring equation till levelling off at T ≥ 240 °K. Although central to photosynthesis, the gating mechanism has not been resolved and due to experimental limitations, could not be explored in vivo. Here we mimic the temperature dependency of "k" by enlarging VD1-208, the volume of a single residue at the crossing point of the D1 and D2 PSII-RC subunits in Synechocystis 6803 whole cells. By controlling the interactions of the D1/D2 subunits, VD1-208 (or 1/T) determines the frequency of attaining an ET-active conformation. Decelerated ET, impaired photosynthesis, D1 repair rate and overall cell physiology upon increasing VD1-208 to above 130 Å3, rationalize the >99% conservation of small residues at D1-208 and its homologous motif in non-oxygenic bacteria. The experimental means and resolved mechanism are relevant for numerous transmembrane protein-gated reactions.
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