2,2′-Dithiodipyridine activates aldehyde dehydrogenase and protects the enzyme against inactivation by disulfiram

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Abstract
Small concentrations of 2,2′-dithiodipyridine cause a rapid activation of sheep liver cytoplasmic aldehyde dehydrogenase in the presence of NAD+. Enzyme pre-modified by 2,2′-dithiodipyridine is largely protected against the potent inactivatory effect of disulfiram. 2,2′-Dithiobis-(5-nitropyridine) inactivates the enzyme. The implications of these results are discussed with reference to various possible classes of thiol group in aldehyde dehydrogenase.