Abstract
1. Nicotinamide nucleotide-linked mitochondrial oxidations were inhibited by the disulphides NNN′N′-tetraethylcystamine, cystamine and cystine diethyl ester, whereas l-homocystine, oxidized mercaptoethanol, oxidized glutathione, NN′-diacetylcystamine and tetrathionate were only slightly inhibitory. Mitochondrial oxidations were not blocked by the thiol cysteamine. 2. NAD-independent oxidations were not inhibited by cystamine. The oxidation of choline was initially stimulated. 3. The inactivation of isocitrate, malate and β-hydroxybutyrate oxidation of intact mitochondria could be partially reversed by external NAD. For the reactivation of α-oxoglutarate oxidation a thiol was also required. 4. A leakage of nicotinamide nucleotides from the mitochondria is suggested as the main cause of the inhibition. In addition, a strong inhibition of α-oxoglutarate dehydrogenase by cystamine was observed. A mixed disulphide formation with CoA and possibly also lipoic acid and lipoyl dehydrogenase is suggested to explain this inhibition.
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Selected References
These references are in PubMed. This may not be the complete list of references from this article.
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