The oxidation-reduction potentials of cytochrome o + c4 and cytochrome o purified from Azotobacter vinelandii
- 1 September 1979
- journal article
- Published by Portland Press Ltd. in Biochemical Journal
- Vol. 181 (3) , 763-766
- https://doi.org/10.1042/bj1810763
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.Keywords
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