PMID: 1654817Jul 1, 1991Paper

Cytochrome c-catalyzed oxidation of organic molecules by hydrogen peroxide

Archives of Biochemistry and Biophysics
R RadiE Prodanov

Abstract

Cytochrome c catalyzed the oxidation of various electron donors in the presence of hydrogen peroxide (H2O2), including 2-2'-azino-bis(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS), 4-aminoantipyrine (4-AP), and luminol. With ferrocytochrome c, oxidation reactions were preceded by a lag phase corresponding to the H2O2-mediated oxidation of cytochrome c to the ferric state; no lag phase was observed with ferricytochrome c. However, brief preincubation of ferricytochrome c with H2O2 increased its catalytic activity prior to progressive inactivation and degradation. Superoxide (O2-) and hydroxyl radical (.OH) were not involved in this catalytic activity, since it was not sensitive to superoxide dismutase (SOD) or mannitol. Free iron released from the heme did not play a role in the oxidative reactions as concluded from the lack of effect of diethylenetriaminepentaacetic acid. Uric acid and tryptophan inhibited the oxidation of ABTS, stimulation of luminol chemiluminescence, and inactivation of cytochrome c. Our results are consistent with an initial activation of cytochrome c by H2O2 to a catalytically more active species in which a high oxidation state of an oxo-heme complex mediates the oxidative reactions. The lack of SOD effect...Continue Reading

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Related Concepts

2,2'-azino-di-(3-ethylbenzothiazoline)-6-sulfonic acid, diammonium salt
Ampyrone
Cytochrome c Group
Oxydol
Phosphorescent Measurements
Oxidation-Reduction
Spectrophotometry
Sulfonic Acids
Benzothiazoles

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