Journal
FEBS LETTERS
Volume 584, Issue 8, Pages 1526-1530Publisher
WILEY
DOI: 10.1016/j.febslet.2010.03.002
Keywords
Photosystem II; Redox potential; Primary quinone electron acceptor Q(A); Spectroelectrochemistry; Photosynthesis; Electron transfer
Funding
- Japan Society for the Promotion of Science (JSPS) [19614003, 21570038]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government [21750012]
- Grants-in-Aid for Scientific Research [19614003, 21750012] Funding Source: KAKEN
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The redox potentials E-m(Q(A)/Q(A)) of the primary quinone electron acceptor Q(A) in oxygen-evolving photosystem II complexes of three species were determined by spectroelectrochemistry. The E-m(Q(A)/Q(A)(-)) values were experimentally found to be -162 +/- 3 mV for a higher plant spinach, -171 +/- 3 mV for a green alga Chlamydomonas reinhardtii and -104 +/- 4 mV vs. SHE for a red alga Cyanidioschyzon merolae. On the basis of possible deviations for the experimental values, as estimated to differ by 9-29 mV from each true value, plausible causes for such remarkable species-dependence of E-m(Q(A)/Q(A)(-)) are discussed, mainly by invoking the effects of extrinsic subunits on the delicate structural environment around Q(A). (C) 2010 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.
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