Abstract

Chlorpromazine was a potent inhibitor of O 2-dependent malate oxidation, but not of H 2 oxidation in Azotobacter vinelandii membranes. However, chlorpromazine did not significantly affect the activity of malate reductase or the reduction of cytochromes c and d. In the presence of chlorpromazine, cytochrome o failed to form a complex with CO. The site of action of chlorpromazine seems to be in the cytochromes c to cytochrome o branch, the pathway utilized by malate, succinate and NADH, but not by H 2.

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