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- Title
Species-dependence of the redox potential of the primary quinone electron acceptor Q<sub>A</sub> in photosystem II verified by spectroelectrochemistry
- Authors
Shibamoto, Tadao; Kato, Yuki; Nagao, Ryo; Yamazaki, Takuya; Tomo, Tatsuya; Watanabe, Tadashi
- Abstract
Abstract: The redox potentials E m(QA/) of the primary quinone electron acceptor QA in oxygen-evolving photosystem II complexes of three species were determined by spectroelectrochemistry. The E m(QA/) values were experimentally found to be −162±3mV for a higher plant spinach, −171±3mV for a green alga Chlamydomonas reinhardtii and −104±4mV vs. SHE for a red alga Cyanidioschyzon merolae. On the basis of possible deviations for the experimental values, as estimated to differ by 9–29mV from each true value, plausible causes for such remarkable species-dependence of E m(QA/) are discussed, mainly by invoking the effects of extrinsic subunits on the delicate structural environment around QA.
- Subjects
OXIDATION-reduction reaction; QUINONE; ELECTROPHILES; PHOTOCHEMISTRY; CHLAMYDOMONAS reinhardtii; GREEN algae; CHLOROPHYLL; ELECTROCHEMISTRY
- Publication
FEBS Letters, 2010, Vol 584, Issue 8, p1526
- ISSN
0014-5793
- Publication type
Article
- DOI
10.1016/j.febslet.2010.03.002