Mammalian alcohol dehydrogenases (ADHs), including ADH1-ADH5/6, interact extensively in the oxidation and reduction of alcohols and aldehydes. ADH1 and ADH2 are involved in several metabolic pathways besides the oxidation of ethanol and have also been shown to be involved in drug transformations. The ADH2 enzymes show further complexity among the species, e.g. in enzymatic characteristics where the rodent forms essentially lack ethanol-oxidizing capacity. ADH3 (glutathione-dependent formaldehyde dehydrogenase) has been shown to catalyze the reductive breakdown of S-nitrosoglutathione, indicating involvement in nitric oxide metabolism. Mass spectrometry identified the major enzymatic product as glutathione sulfinamide. This reductive breakdown directly interferes with the formaldehyde scavenging that has been proposed to be the physiological action of ADH3. The human ADH5 and rodent ADH6 seem to be the corresponding enzymes due to their similar behavior. None of these latter ADHs have so far been assigned to any function. They can be expressed as recombinant proteins but no enzymatic activity has been detected.
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