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The Oxidation of Nicotinic Acid by Pseudomonas Ovalis Chester. The Terminal Oxidase

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Journal Biochem J
Specialty Biochemistry
Date 1972 Sep 1
PMID 4349118
Citations 7
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Abstract

In cell-free extracts of Pseudomonas ovalis nicotinic acid oxidase is confined to the wallmembrane fraction. It is associated with an electron-transport chain comprising b- and c-type cytochromes only, differing proportions of which are reduced by nicotinate and NADH. CO difference-spectra show two CO-binding pigments, cytochrome o (absorption maximum at 417nm) and another component absorbing maximally at 425nm. Cytochrome o is not reduced by NADH or by succinate but is by nicotinate, which can also reduce the ;425' CO-binding pigment. The effects of inhibitors of terminal oxidation support the idea of two terminal oxidases and a scheme involving the ;425' CO-binding pigment and the other components of the electron-transport chain is proposed.

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