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. 1985 Apr;162(1):170–175. doi: 10.1128/jb.162.1.170-175.1985

Identity of Escherichia coli D-1-amino-2-propanol:NAD+ oxidoreductase with E. coli glycerol dehydrogenase but not with Neisseria gonorrhoeae 1,2-propanediol:NAD+ oxidoreductase.

J J Kelley, E E Dekker
PMCID: PMC218970  PMID: 3920199

Abstract

The properties of D-1-amino-2-propanol oxidoreductase from wild-type Escherichia coli have been compared with those of a glycerol dehydrogenase from mutant E. coli 424 and of a 1,2-propanediol oxidoreductase from Neisseria gonorrhoeae. Several independent lines of evidence indicate that the former two enzymes are identical. (i) Both enzymatic activities purified to virtual homogeneity in an identical manner, and the ratio of specific activities (glycerol/aminopropanol) remained constant at all stages. (ii) When electrophoresed, both purified enzymes showed a major as well as a minor band of protein coincident with activity, and these two bands from each enzyme had the same mobility. (iii) The subunit molecular weights and isoelectric points were identical for each enzyme, and (iv) kinetic constants (Km and Vmax values) determined with three different substrates were the same. The somewhat greater stability of the glycerol dehydrogenase to controlled heat denaturation at 74 degrees C was the only difference observed between these two enzymes. In contrast, D-1-amino-2-propanol oxidoreductase was found to be immunochemically and kinetically distinct from the 1,2-propanediol oxidoreductase from N. gonorrhoeae.

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Selected References

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