Species-dependence of the redox potential of the primary quinone electron acceptor QA in photosystem II verified by spectroelectrochemistry

Tadao Shibamoto; Yuki Kato; Ryo Nagao; Takuya Yamazaki; Tatsuya Tomo; Tadashi Watanabe

doi:10.1016/j.febslet.2010.03.002

Species-dependence of the redox potential of the primary quinone electron acceptor Q_A in photosystem II verified by spectroelectrochemistry

Tadao Shibamoto, Yuki Kato, Ryo Nagao, Takuya Yamazaki, Tatsuya Tomo, Tadashi Watanabe

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

The redox potentials E_m(Q_A/QA-) 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/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(Q_A/QA-) are discussed, mainly by invoking the effects of extrinsic subunits on the delicate structural environment around Q_A.

Original language	English
Pages (from-to)	1526-1530
Number of pages	5
Journal	FEBS Letters
Volume	584
Issue number	8
DOIs	https://doi.org/10.1016/j.febslet.2010.03.002
Publication status	Published - Apr 2010
Externally published	Yes

Keywords

Electron transfer
Photosynthesis
Photosystem II
Primary quinone electron acceptor Q
Redox potential
Spectroelectrochemistry

ASJC Scopus subject areas

Biophysics
Structural Biology
Biochemistry
Molecular Biology
Genetics
Cell Biology

Access to Document

10.1016/j.febslet.2010.03.002

Cite this

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title = "Species-dependence of the redox potential of the primary quinone electron acceptor QA in photosystem II verified by spectroelectrochemistry",

abstract = "The redox potentials Em(QA/QA-) of the primary quinone electron acceptor QA in oxygen-evolving photosystem II complexes of three species were determined by spectroelectrochemistry. The Em(QA/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 Em(QA/QA-) are discussed, mainly by invoking the effects of extrinsic subunits on the delicate structural environment around QA.",

keywords = "Electron transfer, Photosynthesis, Photosystem II, Primary quinone electron acceptor Q, Redox potential, Spectroelectrochemistry",

author = "Tadao Shibamoto and Yuki Kato and Ryo Nagao and Takuya Yamazaki and Tatsuya Tomo and Tadashi Watanabe",

year = "2010",

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doi = "10.1016/j.febslet.2010.03.002",

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volume = "584",

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journal = "FEBS Letters",

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T1 - Species-dependence of the redox potential of the primary quinone electron acceptor QA in photosystem II verified by spectroelectrochemistry

AU - Shibamoto, Tadao

AU - Kato, Yuki

AU - Nagao, Ryo

AU - Yamazaki, Takuya

AU - Tomo, Tatsuya

AU - Watanabe, Tadashi

PY - 2010/4

Y1 - 2010/4

N2 - The redox potentials Em(QA/QA-) of the primary quinone electron acceptor QA in oxygen-evolving photosystem II complexes of three species were determined by spectroelectrochemistry. The Em(QA/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 Em(QA/QA-) are discussed, mainly by invoking the effects of extrinsic subunits on the delicate structural environment around QA.

AB - The redox potentials Em(QA/QA-) of the primary quinone electron acceptor QA in oxygen-evolving photosystem II complexes of three species were determined by spectroelectrochemistry. The Em(QA/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 Em(QA/QA-) are discussed, mainly by invoking the effects of extrinsic subunits on the delicate structural environment around QA.

KW - Electron transfer

KW - Photosynthesis

KW - Photosystem II

KW - Primary quinone electron acceptor Q

KW - Redox potential

KW - Spectroelectrochemistry

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