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Previous inhibitor studies on the electron-transport system of Bacillus brevis ATCC 10068 with NADH as substrate showed the incomplete inhibition of NADH oxidase by cyanide and antimycin A (Seddon & Fynn, 1971 ; Fynn & Seddon, 1972). The effects of tyrocidine on component enzymes of the electron-transport chain and of culture age on NADH oxidase have also been reported (Seddon & Fynn, 1973). We now present data showing that component enzymes in the electron-transport particles can be completely inhibited by cyanide and antimycin A and that tyrocidine and tyrothricin cause inhibition of NADH oxidase at or near the level of NADH dehydrogenase, whereas succinoxidase and cytochrome c oxidase activities are considerably less sensitive to the inhibitors. In line with this observation there is no decrease in activity of succinoxidase throughout growth, but NADH oxidase activity falls dramatically.

The Effect of Inhibitors on the Electron-transport Chain of Bacillus brevis. Evidence for Branching of the NADH Oxidase Respiratory Chain