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In the presence of ascorbate, hexaamineruthenium mediates rapid reduction of cytochrome b-562 in submitochondrial particles but not in mitochondria. The reaction is obsreved in the combined presence of antimycin (or funiculosin) and myxothiazol, which implies direct interaction of Ru(NH 3 ) 2+6 with b cytochrome(s). We assume that contrary to previous conclusions (Case and...
When succinate oxidation by submitochondrial particles is blocked by antimycin, NoHOQnO or funiculosin, addition of ferricyanide restores oxygen uptake coupled to membrane potential generation. The effect of ferricyanide is abolished by mucidin or myxothiazol, as well as by KCN. The data strongly favor a cyclic redox loop mechanism in site 2 and show that either heme of the ferrous cytochrome b or...
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