Catalytic significance of binary enzyme-aldehyde complexes in the liver alcohol dehydrogenase reaction
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چکیده
منابع مشابه
Aldehyde-ketone isomerization activity of liver alcohol dehydrogenase.
Horse liver alcohol dehydrogenase is a nonspecific enzyme (1). It has been observed by Kaplan and Ciotti (2) that the enzyme catalyzes a transfer of hydrogen from ethanol to pyridine 3-aldehyde. We have found that the enzyme catalyzes a rapid interconversion of lactaldehyde to acetol. The evidence suggests that this isomerization proceeds through an oxidation-reduction process similar to that o...
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Horse liver aldehyde: NAD oxidoreductase (EC 1.2.1.3) has been purified to homogeneity by a procedure consisting of salt fractionation, ion exchange chromatography, and isoelectric focusing. The purif?ed material has a turnover number of 1.85 pmoles of NADH per min per mg of protein when assayed at pH 9.0 with propionaldehyde as substrate. Values obtained for the molecular weight of the native ...
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Human liver aldehyde dehydrogenase has been found to be capable of hydrolyzing p-nitrophenyl esters. Esterase and dehydrogenase activities exhibited identical ion exchange and affinity properties, indicating that the same protein catalyzes both reactions. Competitive inhibition of esterase activity by glyceraldehyde and chloral hydrate furnished evidence that p-nitrophenyl acetate was hydrolyze...
متن کاملRat Liver Aldehyde Dehydrogenase
From normal rat liver mitochondrial and microsomal fractions, 4 distinct aldehyde dehydrogenase isozymes with millimolar substrate K,,, values have been purified and characterized. Two isozymes were isolated from mitochondria and 2 from microsomes. A mitochondrial aldehyde dehydrogenase with a substrate K,,, in the micromolar range was also identified. Subunit molecular weights for all millimol...
متن کاملZinc-activated alcohols in ternary complexes of liver alcohol dehydrogenase.
Activation parameters for each reaction step in the kinetic mechanism of liver alcohol dehydrogenase have been measured for the oxidation of ethanol and the reduction of acetaldehyde. In the oxidation process, the highest enthalpy of activation, 9.7 kcal/mol, occurs for the turnover of the liver alcohol dehydrogenase-NAD(+)-ethanol ternary complex. To investigate if this enthalpy requirement re...
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ژورنال
عنوان ژورنال: European Journal of Biochemistry
سال: 1984
ISSN: 0014-2956,1432-1033
DOI: 10.1111/j.1432-1033.1984.tb08036.x