EPR Determination of the Oxidation-reduction Potentials of the Hemes in Cytochrome C3 from Desulfovibrio Vulgaris

Overview

Journal Biochimie

Specialty Biochemistry

Date 1978 Jan 1

PMID 208660

Citations 6

Authors

D V DERVARTANIAN

A V Xavier

J L Gall

Affiliations

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Abstract

EPR spectroscopy in conjunction with oxidation-reduction potentiometry has been used to determine the half-reduction potentials of the four hemes of cytochrome c3. As predicted, the four hemes of cytochrome c3 have different mid-point potentials. The Em values are: Heme I,--284 mV; Heme II,--310 mV; Heme III,--324 mV and Heme IV,--319 mV. The n-values in each case was near one.

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