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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Steady-state and pre-steady-state kinetics of propionaldehyde oxidation by sheep liver cytosolic aldehyde dehydrogenase at pH 5.2. Evidence that the release of NADH remains rate-limiting in the enzyme mechanism at acid pH values.

The kcat value for the oxidation of propionaldehyde by sheep liver cytosolic aldehyde dehydrogenase increased 3-fold, from 0.16 s-1 at pH 7.6 to 0.49 s-1 at pH 5.2, in parallel with the increase in the rate of displacement of NADH from binary enzyme.NADH complexes. A burst in nucleotide fluorescence was observed at all pH values consistent with the rate of isomerization of binary enzyme.NADH complexes constituting the rate-limiting step in the steady state. No substrate activation by propionaldehyde was observed at pH 5.2, but the enzyme exhibited dissociation/association behavior. The inactive dissociated form of the enzyme was favored by low enzyme concentration, low pH, and low ionic strength. Propionaldehyde protected the enzyme against dissociation.[1]


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