Abstract
Effect of water-soluble and stable sucrose-bound iron oxyhydroxide nanoparticles [Fe[III] sucrose complex (FSC)] on the efficiency of electron transport in the photosystem II membranes was studied. FSC significantly increases (by a factor 1.5) the rate of light-induced oxygen evolution in the presence of alternative electron acceptor 2,6-dichloro-p-benzoquinone (DCBQ). Without DCBQ, FSC only slightly (5%) provides the oxygen evolution. Electron transport supported by pair DCBQ + FSC is inhibited by diuron. Maximum of stimulating effect was recorded at Fe(III) concentration 5 µM. In the case of another benzoquinone electron acceptor (2-phenyl-p-benzoquinone and 2,3-dimethyl-p-benzoquinone) and 2,6-dichlorophenolindophenol, stimulating effect of FSC was not observed. Incubation of PSII membranes at different concentrations with FSC is accompanied by binding of Fe(III) by membrane components but only about 50% of iron can be extracted by membranes from Fe(III) solution at pH 6.5. This result implies the heterogeneity of FSC solution in a buffer. The heterogeneity depends on pH and decreases with its rising. At pH around 9.0 Fe(III), sucrose solution is homogeneous. The study of pH effect has shown that stimulation of electron transport is induced only by iron cations which can be bound by membranes. Not extractable iron pool cannot activate electron transfer from oxygen-evolving complex to DCBQ.
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Abbreviations
- BPDS:
-
Bathophenanthroline disulfonic acid
- Chl:
-
Chlorophyll
- DCMU:
-
3-(3,4-Dichlorophenyl)-1,1-dimethylurea
- DCBQ:
-
2,6-Dichloro-p-benzoquinone
- DCPIP:
-
2,6-Dichlorophenolindophenol
- DMBQ:
-
2,3-Dimethyl-p-benzoquinone
- HEPES:
-
N-2-hydroxyethylpiperazine-N′-2-ethanesulfonic acid
- FSC:
-
Fe(III) sucrose complex
- MES:
-
2-(N-morpholino)-ethanesulfonic acid
- OEC:
-
Oxygen-evolving complex
- PQ:
-
Plastoquinone
- PPBQ:
-
2-Phenyl-p-benzoquinone
- PSII:
-
Photosystem II
- PSII(-Ca):
-
Ca2+-depleted PSII membranes
- RC:
-
Reaction center
- Tris:
-
Tris(hydroxymethyl)aminomethane
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Acknowledgements
We are very grateful to Dr. Kholina E.G. for helping in the measurement of zeta potential.
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Semin, B.К., Davletshina, L.N. & Rubin, A.B. Effect of sucrose-bound polynuclear iron oxyhydroxide nanoparticles on the efficiency of electron transport in the photosystem II membranes. Photosynth Res 142, 57–67 (2019). https://doi.org/10.1007/s11120-019-00647-4
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DOI: https://doi.org/10.1007/s11120-019-00647-4