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High-light-induced superoxide anion radical formation in cytochrome b 6 f complex from spinach as detected by EPR spectroscopy

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Photosynthetica

An Erratum to this article was published on 01 September 2011

Abstract

The generation of superoxide anion radical (O2 ·−) in the cytochrome b 6 f complex (Cyt b 6 f) of spinach under high-light illumination was studied using electron paramagnetic resonance spectroscopy. The generation of O2 ·− was lost in the absence of molecular oxygen. It was also suppressed in the presence of NaN3 and could be scavenged by extraneous antioxidants such as ascorbate, β-carotene, and glutathione. The results also indicate that O2 ·−, which is produced under high-light illumination of the Cyt b 6 f from spinach, might be generated from a reaction involing 1O2, and the Rieske Fe-S protein could serve as the electron donor in the O2 ·− production. The mechanism of photoprotection of the Cyt b 6 f complex by antioxidants is discussed.

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Abbreviations

Car:

carotene

Chl a :

chlorophyll a

3Chl a*:

triplet excited state of chlorophyll a

Cyt b 6 f :

cytochrome b 6 f complex

EMPO:

2-ethoxycarbonyl-2-methyl-3,4-dihydro-2H-pyrrole-1-oxide

EPR:

electron paramagnetic resonance

O2 ·− :

superoxide anion radical

ROS:

reactive oxygen species

1O2:

singlet oxygen

TEMP:

2,2,6,6-tetramethylpiperidine

β-DM:

n-dodecyl-β-D-maltoside

β-OG:

n-octyl-β-D-glucopyranoside

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Acknowledgements

This work has been jointly supported by the National Basic Research Program of China (973 Programs, 2009CB118501 and 2009CB220008), the Knowledge Innovation Program of the Chinese Academy of Sciences (Grant No. KGCX2-YW-375-3 and KSCX2-YW-R-137), the National Natural Science Foundation (30900095) and the Natural Science Foundation of Hebei Province (C2008000684).

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An erratum to this article can be found at http://dx.doi.org/10.1007/s11099-011-0059-2

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Sang, M., Qin, X.C., Wang, W.D. et al. High-light-induced superoxide anion radical formation in cytochrome b 6 f complex from spinach as detected by EPR spectroscopy. Photosynthetica 49, 48–54 (2011). https://doi.org/10.1007/s11099-011-0008-0

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