Enzymes
| UniProtKB help_outline | 3 proteins |
Reaction participants Show >> << Hide
- Name help_outline acetaldehyde Identifier CHEBI:15343 (Beilstein: 505984; CAS: 75-07-0) help_outline Charge 0 Formula C2H4O InChIKeyhelp_outline IKHGUXGNUITLKF-UHFFFAOYSA-N SMILEShelp_outline [H]C(C)=O 2D coordinates Mol file for the small molecule Search links Involved in 46 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline acetoin Identifier CHEBI:15688 (CAS: 513-86-0) help_outline Charge 0 Formula C4H8O2 InChIKeyhelp_outline ROWKJAVDOGWPAT-UHFFFAOYSA-N SMILEShelp_outline CC(O)C(C)=O 2D coordinates Mol file for the small molecule Search links Involved in 15 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:54364 | RHEA:54365 | RHEA:54366 | RHEA:54367 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Brewers' yeast pyruvate decarboxylase produces acetoin from acetaldehyde: a novel tool to study the mechanism of steps subsequent to carbon dioxide loss.
Chen G.C., Jordan F.
A gas-liquid chromatographic technique was developed for the determination of both acetaldehyde and the 3-4% acetoin side product that results from the brewers' yeast pyruvate decarboxylase (EC 4.1.1.1) catalyzed reaction of pyruvic acid. Employing this method enabled the demonstration of the cata ... >> More
A gas-liquid chromatographic technique was developed for the determination of both acetaldehyde and the 3-4% acetoin side product that results from the brewers' yeast pyruvate decarboxylase (EC 4.1.1.1) catalyzed reaction of pyruvic acid. Employing this method enabled the demonstration of the catalysis of acetaldehyde condensation to acetoin by the enzyme. It was found that the acetoin produced enzymatically from pyruvic acid or from acetaldehyde was optically active, thus providing stereochemical information about the reaction. Deuterium kinetic isotope effects (employing CH3CHO and CH3CDO) were determined on the steady-state kinetic parameters to be 4.5 (Vmax) and 3.2 (Vmax/Kappm), respectively. This enabled, for the first time, the estimation of relative kinetic barriers for steps past decarboxylation. It could be concluded that (a) C-H bond scission was part of rate limitation in the enzyme-catalyzed condensation of acetaldehyde to acetoin and that (b) among the steps leading to the release of acetaldehyde, protonation of the key enamine intermediate was part of rate limitation. This latter finding is also directly applicable to the mechanism of pyruvate decarboxylation. << Less
Biochemistry 23:3576-3582(1984) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.