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. 1982 Jun 1;203(3):551–558. doi: 10.1042/bj2030551

A quantitative test for superoxide radicals produced in biological systems.

H Kuthan, V Ullrich, R W Estabrook
PMCID: PMC1158268  PMID: 6288006

Abstract

The preparation and properties of a partially succinoylated cytochrome c, suited for the detection of superoxide anion radicals in liver microsomes, is reported. By succinoylation of 45% of the primary amino groups of horse heart cytochrome c the activity towards solubilized NADPH--cytochrome P-450 reductase was diminished by 99% compared with native cytochrome c. The capacities of cytochrome b5 and cytochrome c oxidase to reduce the succinoylated ferricytochrome c and oxidize succinoylated ferrocytochrome c respectively were decreased to a similar extent. However, the bimolecular rate constant for the reduction of the partially succinoylated ferricytochrome c by O2-. was estimated to be one-tenth of the value for the reaction of O2-. with native ferricytochrome c a pH 7.7. On this basis the quantification of O2-. generated by NADPH-supplemented liver microsomes became possible. The initial rates of succinoylated ferricytochrome c reduction determined at various finite concentrations of the cytochrome c derivative can be extrapolated to obtain true rates of O2-. generation in a homogeneous system. The problems encountered in the quantitative determination of O2-. produced in biological membranes, e.g. microsomes, are discussed.

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Selected References

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