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- W1575798933 abstract "Starch gel electrophoresis of homogenates from human stomach mucosa resolves three alcohol dehydrogenase (ADH) forms: the anodic chi-ADH (class III), the cathodic gamma-ADH (class I), and a new form of slow cathodic mobility that has not been previously characterized. In this work, we describe the purification in three chromatographic steps and the physical and kinetic characterization of this new human alcohol dehydrogenase, which we have named sigma-ADH. The enzyme exhibits the general physicochemical features (Mr, zinc content, subunit Mr, cofactor preference) of all mammalian alcohol dehydrogenases. The kinetic studies show a high Km value (41 mM) and a high kcat value (280 min-1) for ethanol at pH 7.5. The Km decreases as the alcohol increases its chain length. The aldehydes are better substrates than the corresponding alcohols, with m-nitrobenzaldehyde being the best substrate examined. sigma-ADH is strongly inhibited by 4-methylpyrazole, but with a Ki (10 microM) still higher than that for a class I isoenzyme. These properties suggest that sigma-ADH is a class II isoenzyme, different from pi-ADH and similar to that previously described by us in rat stomach. At the high ethanol concentrations in stomach after drinking, sigma-ADH is probably the ADH form with the largest contribution to human gastric ethanol metabolism." @default.
- W1575798933 created "2016-06-24" @default.
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- W1575798933 date "1991-01-01" @default.
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- W1575798933 title "Purification and characterization of a new alcohol dehydrogenase from human stomach." @default.
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- W1575798933 doi "https://doi.org/10.1016/s0021-9258(17)35292-4" @default.
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