ArticleJournal of bioenergetics and biomembranes2016
Substituting Fe for two of the four Mn ions in photosystem II-effects on water-oxidation.
Article in Journal of bioenergetics and biomembranes, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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8 citing papers in PubMed.
- Light increases resistance of thylakoid membranes to thermal inactivation.Journal of plant research · 2024Article
- Current analysis of cations substitution in the oxygen-evolving complex of photosystem II.Biophysical reviews · 2024Review
- Structural and energetic insights into Mn-to-Fe substitution in the oxygen-evolving complex.iScience · 2023Article
- High-efficiency oxygen evolution by photosystem II oxygen-evolving complex containing 3Mn per reaction center.Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry · 2023Article
- CaPhotosynthesis research · 2021Article
- Effective binding of TbJournal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry · 2021Article
- pH dependence of photosystem II photoinhibition: relationship with structural transition of oxygen-evolving complex at the pH of thylakoid lumen.Photosynthesis research · 2020Article
- Effect of sucrose-bound polynuclear iron oxyhydroxide nanoparticles on the efficiency of electron transport in the photosystem II membranes.Photosynthesis research · 2019Article
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2 authors.
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Abstract
We have investigated the interaction of Fe(II) cations with Ca-depleted PSII membranes (PSII[-Ca,4Mn]) in the dark and found that Fe(II) incubation removes 2 of 4 Mn ions from the tetranuclear Mn cluster of the photosynthetic O2-evolving complex (OEC). The reduction of Mn ions in PSII(-Ca,4Mn) by Fe(II) and the concomitant release of two Mn(II) cations is accompanied by the binding of newly generated Fe(III) in at least one vacated Mn site. Flash-induced chlorophyll (Chl) fluorescence yield measurements of this new 2Mn/nFe cluster (PSII[-Ca,2Mn,nFe]) show that charge recombination in the presence of 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU) occurs between Qa (-) and the remaining Mn/Fe cluster (but not YZ (●)) in the OEC, and extraction of 2 Mn occurs uniformly in all PSII complexes. No O2 evolution is observed, but the heteronuclear metal cluster in PSII(-Ca,2Mn,nFe) samples is still able to supply electrons for reduction of the exogenous electron acceptor, 2,6-dichlorophrenolindophenol, by photooxidizing water and producing H2O2 in the absence of an exogenous donor as seen previously with PSII(-Ca,4Mn). Selective extraction of Mn or Fe cations from the 2Mn/nFe heteronuclear cluster demonstrates that the high-affinity Mn-binding site is occupied by one of the iron cations. It is notable that partial water-oxidation function still occurs when only two Mn cations are present in the PSII OEC.
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