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Mechanisms of quinol oxidation in photosynthesis

Rich, PR; (1985) Mechanisms of quinol oxidation in photosynthesis. Photosynthesis Research , 6 (4) pp. 335-348. 10.1007/BF00054107.

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Abstract

The mechanisms by which para-benzoquinols can be oxidized is reviewed. Emphasis is placed on the information available from chemical and electrochemical studies which may provide insight into the biochemical mechanisms of plastoquinol oxidation in the chloroplast. Three mechanisms of quinol oxidation are possible: (1) The removal of an electron from the quinol, QHinf2sup·t, directly to produce the radical cation, QH2·+. This may be achieved electrochemically only at very high potential in acidic media. The reaction may be of relevance to D1, the donor to P-680. (2) The removal of an electron from the anionic quinol. QH-, formed by quinol deprotonation. It is likely that the catalytic mechanism of the cytochrome bf complex involves this mechanism. (3) The removal of an electron from the dianionic quinol, Q2-. This route will be dominant only under basic or aprotic conditions and at very low potentials. © 1985 Martinus Nijhoff/Dr W. Junk Publishers.

Type: Article
Title: Mechanisms of quinol oxidation in photosynthesis
DOI: 10.1007/BF00054107
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Structural and Molecular Biology
URI: http://discovery.ucl.ac.uk/id/eprint/10026604
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