Modulating the Redox Potential of the Stable Electron Acceptor, QB, in Mutagenized Photosystem II Reaction Centers

Biochemistry ◽  
2011 ◽  
Vol 50 (9) ◽  
pp. 1454-1464 ◽  
Author(s):  
Zoee Perrine ◽  
Richard Sayre
Keyword(s):  
Photosystem Ii ◽  
Redox Potential ◽  
Electron Acceptor ◽  
Reaction Centers

Linear dichroism and orientation of pheophytin, the intermediary electron acceptor in photosystem II reaction centers

FEBS Letters ◽  
1982 ◽  
Vol 140 (1) ◽  
pp. 127-130 ◽  
Author(s):  
Irene B. Ganago ◽  
Vyacheslav V. Klimov ◽  
Alexander O. Ganago ◽  
Vladimir A. Shuvalov ◽  
Yuri E. Erokhin
Keyword(s):  
Photosystem Ii ◽  
Electron Acceptor ◽  
Linear Dichroism ◽  
Reaction Centers

ENDOR studies of the intermediate electron acceptor radical anion I-· in photosystem II reaction centers

1989 ◽  
Vol 977 (2) ◽  
pp. 227-232 ◽  
Author(s):  
W. Lubitz ◽  
R.A. Isaacson ◽  
M.Y. Okamura ◽  
E.C. Abresch ◽  
M. Plato ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Electron Acceptor ◽  
Radical Anion ◽  
Reaction Centers

Redox Potential of the Primary Plastoquinone Electron Acceptor QAin Photosystem II fromThermosynechococcus elongatusDetermined by Spectroelectrochemistry

Biochemistry ◽  
2009 ◽  
Vol 48 (45) ◽  
pp. 10682-10684 ◽  
Author(s):  
Tadao Shibamoto ◽  
Yuki Kato ◽  
Miwa Sugiura ◽  
Tadashi Watanabe
Keyword(s):  
Photosystem Ii ◽  
Redox Potential ◽  
Electron Acceptor

scholarly journals Redox potential of the terminal quinone electron acceptor QB in photosystem II reveals the mechanism of electron transfer regulation

2015 ◽  
Vol 113 (3) ◽  
pp. 620-625 ◽  
Author(s):  
Yuki Kato ◽  
Ryo Nagao ◽  
Takumi Noguchi
Keyword(s):  
Electron Transfer ◽  
Photosystem Ii ◽  
Redox Potential ◽  
Electron Acceptor ◽  
Light Energy ◽  
Large Decrease ◽  
Difference Spectroscopy ◽  
Light Energy Conversion ◽  
First Time ◽  
Electron Transfers

Photosystem II (PSII) extracts electrons from water at a Mn4CaO5 cluster using light energy and then transfers them to two plastoquinones, the primary quinone electron acceptor QA and the secondary quinone electron acceptor QB. This forward electron transfer is an essential process in light energy conversion. Meanwhile, backward electron transfer is also significant in photoprotection of PSII proteins. Modulation of the redox potential (Em) gap of QA and QB mainly regulates the forward and backward electron transfers in PSII. However, the full scheme of electron transfer regulation remains unresolved due to the unknown Em value of QB. Here, for the first time (to our knowledge), the Em value of QB reduction was measured directly using spectroelectrochemistry in combination with light-induced Fourier transform infrared difference spectroscopy. The Em(QB−/QB) was determined to be approximately +90 mV and was virtually unaffected by depletion of the Mn4CaO5 cluster. This insensitivity of Em(QB−/QB), in combination with the known large upshift of Em(QA−/QA), explains the mechanism of PSII photoprotection with an impaired Mn4CaO5 cluster, in which a large decrease in the Em gap between QA and QB promotes rapid charge recombination via QA−.

scholarly journals Influence of the Redox Potential of the Primary Quinone Electron Acceptor on Photoinhibition in Photosystem II

2007 ◽  
Vol 282 (17) ◽  
pp. 12492-12502 ◽  
Author(s):  
Christian Fufezan ◽  
Christine M. Gross ◽  
Martin Sjödin ◽  
A. William Rutherford ◽  
Anja Krieger-Liszkay ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Redox Potential ◽  
Electron Acceptor

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

FEBS Letters ◽  
2010 ◽  
Vol 584 (8) ◽  
pp. 1526-1530 ◽  
Author(s):  
Tadao Shibamoto ◽  
Yuki Kato ◽  
Ryo Nagao ◽  
Takuya Yamazaki ◽  
Tatsuya Tomo ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Redox Potential ◽  
Electron Acceptor
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