The Oxidation-reduction Potentials of Cytochrome O + C4 and Cytochrome O Purified from Azotobacter Vinelandii

Overview

Journal Biochem J

Specialty Biochemistry

Date 1979 Sep 1

PMID 518554

Citations 3

Authors

T Yang

D OKeefe

B Chance

Affiliations

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Abstract

Oxidation-reduction titrations of Azotobacter vinelandii cytochrome o + c4 and cytochrome o were performed with simultaneous potential and absorbance measurements under anaerobic conditions. Cytochrome c4 has a midpoint potential (Em, 7.4) of 260mV and purified cytochrome o has an Em, 7.4 of -18mV. Little change in the midpoint potential of cytochrome o was observed when titrated in the pH range 6.2--9.8.

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