Abstract
Respiratory chain composition of the ethanol-producing bacterium Zymomonas mobilis was studied. Its membrane d-lactate oxidase was characterised. With NADH, but not d-lactate as substrate, a cytochrome o-like component was seen in CO difference spectra. Chlorpromazine specifically inhibited reduction of cytochrome d, while myxothiazol eliminated the cytochrome o-like features in CO difference spectra. It is suggested that electrons from NADH are distributed between branches terminated by the cytochrome o-like component, cytochrome a, and cytochrome d. With d-lactate, electrons are transported to cytochrome a, or an unidentified CN −-sensitive oxidase, and cytochrome d.
Published Version
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