Plastoquinol generates and scavenges reactive oxygen species in organic solvent: Potential relevance for thylakoids |
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| Authors: | Sergey Khorobrykh Esa Tyystjärvi |
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| Affiliation: | Department of Biochemistry/Molecular Plant Biology, University of Turku, FI-20014 Turku, Finland |
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| Abstract: | The present work reports reactions of plastoquinol (PQH2-9) and plastoquinone (PQ-9) in organic solvents and summarizes the literature to understand similar reactions in thylakoids. In thylakoids, PQH2-9 is oxidized by the cytochrome b6/f complex (Cyt b6/f) but some PQH2-9 is also oxidized by reactions in which oxygen acts as an electron acceptor and is converted to reactive oxygen species (ROS). Furthermore, PQH2-9 reacts with ROS. Light enhances oxygen-dependent oxidation of PQH2-9. We examined the oxidation of PQH2-9 via dismutation of PQH2-9 and PQ-9 and scavenging of the superoxide anion radical (O2 | |
| Keywords: | Hydrogen peroxide Plastoquinone Singlet oxygen Superoxide anion radical Thylakoid membrane |
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