Modulation of redox potential in electron transfer proteins: Effects of complex formation on the active site microenvironment of cytochrome b5

2000 ◽  
Vol 116 ◽  
pp. 221-234 ◽  
Author(s):  
Marc Wirtz ◽  
Vaheh Oganesyan ◽  
Xuejun Zhang ◽  
Joe Studer ◽  
Mario Rivera
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Redox Potential ◽  
Active Site ◽  
Cytochrome B5 ◽  
Electron Transfer Proteins

scholarly journals The redox potentials of the two-iron plant algal ferredoxins. An electrostatic model

1973 ◽  
Vol 133 (2) ◽  
pp. 283-287 ◽  
Author(s):  
R. J. Kassner ◽  
W. Yang
Keyword(s):  
Electron Transfer ◽  
Free Energy ◽  
Redox Potential ◽  
Negative Charge ◽  
Electrostatic Model ◽  
Redox Potentials ◽  
Electron Transfer Proteins ◽  
Electrostatic Free Energy ◽  
The One ◽  
Charged Ions

The two-iron–sulphur co-ordination centre in plant and algal ferredoxins is considered as a collection of charged ions whose net negative charge is twice that of the one-iron–sulphur protein rubredoxin. Calculation of the electrostatic free-energy changes for reduction of the two types of proteins indicates that the redox potential of the two-iron–sulphur proteins should be more negative than that of the one-iron–sulphur protein and that in biological systems the ferredoxins should function as one-electron transfer proteins.

Dynamics in transient complexes of redox proteins

2012 ◽  
Vol 40 (2) ◽  
pp. 415-418 ◽  
Author(s):  
Marcellus Ubbink
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Protein Complex ◽  
Biological Function ◽  
Experimental Information ◽  
Electron Transfer Proteins ◽  
Protein Complex Formation ◽  
Initial Stage ◽  
Encounter Complex

Recent studies have provided experimental information about the initial stage of protein complex formation, the encounter complex. This stage is particularly important in the weak and transient complexes formed between electron transfer proteins and their partners. These studies are discussed and the role of the encounter complex is interpreted in terms of the specific requirements that the biological function puts on these complexes.

Formation of CT complexes and electron transfer from excited molecules of anthracene derivatives to methylviologen in aqueous and micellar media

1987 ◽  
Vol 52 (7) ◽  
pp. 1658-1665
Author(s):  
Viktor Řehák ◽  
Jana Boledovičová
Keyword(s):  
Electron Transfer ◽  
Complex Formation ◽  
Fluorescence Quenching ◽  
Rate Constant ◽  
Formation Constants ◽  
Dynamic Quenching ◽  
Micellar Media ◽  
Complex Formation Constants ◽  
Anthracene Derivatives ◽  
Ct Complexes

Disodium 1,5- and 1,8-anthracenedisulphonate (ADS) and 9-acetylanthracene form coloured CT complexes with methylviologen (MV2+) in aqueous and micellar media. The complex formation constants and molar absorptivities were determined by the Benesi-Hildebrandt method. In the fluorescence quenching, its static component plays the major role. The dynamic quenching component is determined by the rate constant of electron transfer from the S1 state of ADS to MV2+.

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