Temporary Stabilization of Electron on Quinone Acceptor Side of Reaction Centers from the Bacterium Rhodobacter sphaeroides Wild Type and Mutant SA(L223) Depending on Duration of Light Activation

2004 ◽  
Vol 69 (8) ◽  
pp. 890-896 ◽  
Author(s):  
P. P. Knox ◽  
N. I. Zakharova ◽  
N. H. Seifullina ◽  
I. Yu. Churbanova ◽  
M. D. Mamedov ◽  
...  
Keyword(s):  
Rhodobacter Sphaeroides ◽  
Reaction Centers ◽  
Light Activation ◽  
Wild Type ◽  
Acceptor Side ◽  
Temporary Stabilization ◽  
Quinone Acceptor

Stabilization of the electron in the quinone acceptor part of the Rhodobacter sphaeroides reaction centers

BIOPHYSICS ◽  
2008 ◽  
Vol 53 (4) ◽  
pp. 291-295
Author(s):  
P. P. Knox ◽  
P. M. Krasilnikov ◽  
P. A. Mamonov ◽  
N. Kh. Seifullina ◽  
A. F. Uchoa ◽  
...  
Keyword(s):  
Rhodobacter Sphaeroides ◽  
Reaction Centers ◽  
Quinone Acceptor

Lipids affect the charge stabilization in wild-type and mutant reaction centers of Rhodobacter sphaeroides R-26

1999 ◽  
Vol 26 (5) ◽  
pp. 465 ◽  
Author(s):  
László Nagy ◽  
Elfrida Fodor ◽  
Júlia Tandori ◽  
László Rinyu ◽  
Tibor Farkas
Keyword(s):  
Electron Transfer ◽  
Rhodobacter Sphaeroides ◽  
Electrostatic Interactions ◽  
Reaction Centers ◽  
Wild Type ◽  
Photosynthetic Membrane ◽  
Protein Ratio ◽  
Intracytoplasmic Membranes ◽  
In The Wild ◽  
Charge Stabilization

The effect of lipids on stabilization of electrons on the secondary quinone was studied in reaction centers (RC) of herbicide-sensitive and -resistant (L229Ile → Met) Rhodobacter sphaeroides R-26. The lipid concentration and the lipid/protein ratio of the intracytoplasmic membranes (ICM) were larger in the mutant RCs than in the wild-type. The free energy changes of Q A – Q B → Q A Q B – electron transfer were ΔG 0 = –57 meV, –69 meV, –85 meV for the wild-type and ΔG 0 = 0 meV, –15 meV, –46 meV for the mutant at pH = 8.0, in detergent, liposome and ICM, respectively. The differences in the stabilization energies of both strains decreased from the detergent via proteoliposome to chromatophore. We conclude that the energetics of the interquinone electron transfer depends on the environment of the reaction center. The steric and/or electrostatic interactions of the environment and Q B pocket can modulate the energetics of the charge stabilization over large distances. The interaction may have crucial importance on coupling the electron transport in the photosynthetic membrane to the anabolic/catabolic processes taking place in the cells.

The influence of alkylhydroxybenzenes on electron stabilization processes in the quinone acceptor portion of the reaction centers of the bacterium Rhodobacter sphaeroides

Microbiology ◽  
2010 ◽  
Vol 79 (2) ◽  
pp. 262-264 ◽  
Author(s):  
P. P. Knox ◽  
E. P. Lukashev ◽  
A. V. Simanova ◽  
Yu. F. Krupyanskii ◽  
N. G. Loiko ◽  
...  
Keyword(s):  
Rhodobacter Sphaeroides ◽  
Reaction Centers ◽  
Quinone Acceptor
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