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Species‐dependence of the redox potential of the primary quinone electron acceptor Q A in photosystem II verified by spectroelectrochemistry
Author(s) -
Shibamoto Tadao,
Kato Yuki,
Nagao Ryo,
Yamazaki Takuya,
Tomo Tatsuya,
Watanabe Tadashi
Publication year - 2010
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2010.03.002
Subject(s) - photosystem i , photosystem ii , p700 , redox , quinone , electron acceptor , chlamydomonas reinhardtii , chemistry , electron transport chain , acceptor , photochemistry , photosynthesis , spinach , electron transfer , crystallography , stereochemistry , physics , inorganic chemistry , biochemistry , gene , condensed matter physics , mutant
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 .