The thiol groups of yeast alcohol dehydrogenase
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چکیده
منابع مشابه
Role of the essential thiol groups of yeast alcohol dehydrogenase.
1. Yeast alcohol dehydrogenase inactivated by reaction with iodoacetamide retains 85% of the original NADH-binding capacity as measured under conditions of saturating coenzyme concentration. 2. The dissociation constant of the enzyme-NADH complex is unaffected by inactivation of the enzyme with iodoacetamide, and the affinity of the enzyme for NAD(+) and pyridine-3-aldehyde-adenine dinucleotide...
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1. 3-Acetoxyoestra1,3,5(10),6-tetraen17-one was catalytically reduced in an atmosphere of tritium-hydrogen gas to yield [6,7-3H2]oestrone acetate which, on hydrolysis, gave [6,7-8H2]oestrone. In two experiments the radiochemical yields were 34-2 and 15-5 % respectively. [6,7-3H2]Oestrone of high specific activity (20-2 mc/mg. or 5-45c/m-mole) was obtained in the second (3c of tritium gas) run. ...
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The alcohol dehydrogenases (ADH) crystallized from yeast (1, 2) and from horse liver (3) differ in many of their properties. The mammalian enzyme forms a complex with reduced diphosphopyridine nucleotide in which the absorption band of the coenzyme at 340 rnp is shifted to 325 rnh (4). This permitted the direct study by Theorell and Chance (5) of the stoichiometry and dissociation constant of t...
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The importance of carboxyl groups near the active site zinc for the catalytic function of alcohol dehydrogenase I from Saccharomyces cerevisiae was examined by directed mutagenesis and steady state kinetics. Asp-49 was changed to asparagine and Glu-68 to glutamine (residue numbering as for horse liver enzyme). The catalytic efficiencies (V/Km) for ethanol oxidation and acetaldehyde reduction we...
متن کاملYeast Alcohol Dehydrogenase Structure and Catalysis
Yeast (Saccharomyces cerevisiae) alcohol dehydrogenase I (ADH1) is the constitutive enzyme that reduces acetaldehyde to ethanol during the fermentation of glucose. ADH1 is a homotetramer of subunits with 347 amino acid residues. A structure for ADH1 was determined by X-ray crystallography at 2.4 Å resolution. The asymmetric unit contains four different subunits, arranged as similar dimers named...
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ژورنال
عنوان ژورنال: Biochemical Journal
سال: 1964
ISSN: 0006-2936
DOI: 10.1042/bj0900532