pH and Solvent H/D Isotope Effects on the Thermodynamics and Kinetics of Electron Transfer for Electrode-Immobilized Native and Urea-Unfolded Stellacyanin

Langmuir ◽  
2012 ◽  
Vol 28 (42) ◽  
pp. 15087-15094 ◽  
Author(s):  
Antonio Ranieri ◽  
Gianantonio Battistuzzi ◽  
Marco Borsari ◽  
Carlo Augusto Bortolotti ◽  
Giulia Di Rocco ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Isotope Effects ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of

scholarly journals The effects of the chemical environment of menaquinones in lipid monolayers on mercury electrodes on the thermodynamics and kinetics of their electrochemistry

2021 ◽  
Author(s):  
Karuppasamy Dharmaraj ◽  
Dirk Dattler ◽  
Heike Kahlert ◽  
Uwe Lendeckel ◽  
Felix Nagel ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Transfer Rate ◽  
Chemical Environment ◽  
Lipid Monolayers ◽  
Redox Potentials ◽  
Electron Transfer Rate ◽  
Thermodynamics And Kinetics ◽  
Mercury Electrodes ◽  
Kinetics Of

AbstractThe effects of the chemical environment of menaquinones (all-trans MK-4 and all-trans MK-7) incorporated in lipid monolayers on mercury electrodes have been studied with respect to the thermodynamics and kinetics of their electrochemistry. The chemical environment relates to the composition of lipid films as well as the adjacent aqueous phase. It could be shown that the addition of all-trans MK-4 to TMCL does not change the phase transition temperatures of TMCL. In case of DMPC monolayers, the presence of cholesterol has no effect on the thermodynamics (formal redox potentials) of all-trans MK-7, but the kinetics are affected. Addition of an inert electrolyte (sodium perchlorate; change of ionic strength) to the aqueous phase shifts the redox potentials of all-trans MK-7 only slightly. The formal redox potentials of all-trans MK-4 were determined in TMCL and nCL monolayers and found to be higher in nCL monolayers than in TMCL monolayers. The apparent electron transfer rate constants, transfer coefficients and activation energies of all-trans MK-4 in cardiolipins have been also determined. Most surprisingly, the apparent electron transfer rate constants of all-trans MK-4 exhibit an opposite pH dependence for TMCL and nCL films: the rate constants increase in TMCL films with increasing pH, but in nCL films they increase with decreasing pH. This study is a contribution to understand environmental effects on the redox properties of membrane bond redox systems. Graphical abstract

Long-range electron–electron interaction and charge transfer in protein complexes: a numerical approach

2019 ◽  
Vol 21 (34) ◽  
pp. 18595-18604 ◽  
Author(s):  
David Gnandt ◽  
Thorsten Koslowski
Keyword(s):  
Electron Transfer ◽  
Charge Transfer ◽  
Protein Complexes ◽  
Numerical Approach ◽  
Pair Approximation ◽  
Electron Interaction ◽  
Coulomb Interactions ◽  
Electron Transfer Proteins ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of

Coulomb interactions in large electron transfer proteins can be addressed within a pair approximation. They have a profound effect on the thermodynamics and kinetics of charge transport.

scholarly journals The Thermodynamics and Kinetics of Electron Transfer between Cytochromeb6fand Photosystem I in the Chlorophylld-dominated Cyanobacterium,Acaryochloris marina

2008 ◽  
Vol 283 (37) ◽  
pp. 25218-25226 ◽  
Author(s):  
Benjamin Bailleul ◽  
Xenie Johnson ◽  
Giovanni Finazzi ◽  
James Barber ◽  
Fabrice Rappaport ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photosystem I ◽  
Thermodynamics And Kinetics ◽  
Acaryochloris Marina ◽  
Kinetics Of

scholarly journals The thermodynamics and kinetics of electron transfer in the cytochrome P450cam enzyme system

FEBS Letters ◽  
1999 ◽  
Vol 451 (3) ◽  
pp. 351-353 ◽  
Author(s):  
Michael J Honeychurch ◽  
H.Allen O Hill ◽  
Luet-Lok Wong
Keyword(s):  
Electron Transfer ◽  
Enzyme System ◽  
Cytochrome P450cam ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of
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