Superoxide oxidase and reductase activity of cytochrome b559 in photosystem II

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F09%3A00010346" target="_blank" >RIV/61989592:15310/09:00010346 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Superoxide oxidase and reductase activity of cytochrome b559 in photosystem II
Original language description
This study provides evidence for the superoxide oxidase and the superoxide reductase activity of cytochrome b559 (cyt b559) in PSII. It is reported that in Tris-treated PSII membranes upon illumination, both the intermediate potential (IP) and the reduced high potential (HPred) forms of cyt b559 exhibit superoxide scavenging activity and interconversion between IP and HPred form. When Tris-treated PSII membranes were illuminated in the presence of spin trap EMPO, the formation of superoxide anion radical (O2?-) was observed, as confirmed by EPR spin-trapping spectroscopy. The observations that the addition of enzymatic (superoxide dismutase) and non-enzymatic (cytochrome c, ?-tocopherol and Trolox) O2?- scavengers prevented the light-induced conversionof IP?HPred cyt b559 confirmed that IP and HPred cyt b559 is reduced and oxidized by O2?-, respectively. Redox changes in cyt b559 by an exogenous source of O2?- reconfirmed the superoxide oxidase and reductase activity of cyt b559. Furt
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
BO - Biophysics
OECD FORD branch
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Publication year
2009
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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