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- W1552415157 abstract "The effects of increasing concentrations of Cl−, ClO4−, and HCO3− on the redox potential of Rhodopseudomonas palustris cytochrome c2 indicate that the two polyatomic anions bind specifically to the protein at one site, while chloride simply exerts an ionic atmosphere effect. The change in E° upon specific anion binding allows us to probe for the influence of surface charges on the redox potential of cytochromes c. The decrease in redox potential at null ionic strength (ΔEI=0°) due to anion neutralization of one positive surface charge was found to be 23 mV with perchlorate and 33 mV with bicarbonate. These values compare reasonably well with previous theoretical predictions and estimates of the effect of charge alteration on the E° values in cytochromes c chemically modified or mutated at surface lysines. These ΔE° values, determined on the unmodified protein, are unprecedented for c-type cytochromes. The anion-induced chemical shift changes of the hyperfine-shifted heme 1H-NMR resonances of the oxidized protein yield lower limit values of 53 M−1 and 18 M−1 for the affinity constant for specific HCO3− and ClO− binding, respectively." @default.
- W1552415157 created "2016-06-24" @default.
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- W1552415157 date "1995-10-01" @default.
- W1552415157 modified "2023-09-26" @default.
- W1552415157 title "Cyclic Voltammetry and 1H-NMR of Rhodopseudomonas palustris Cytochrome c2. Probing Surface Charges through Anion-Binding Studies" @default.
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- W1552415157 doi "https://doi.org/10.1111/j.1432-1033.1995.335_1.x" @default.
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