Abstract

The R-2-hydroxypropyl-coenzyme M (2-mercaptoethanesulfonate) dehydrogenase is a key enzyme in the microbial conversion of propylene to the central metabolite acetoacetate. This enzyme is an interesting member of the NAD(P)H-dependent short-chain dehydrogenase/reductase (SDR) family of enzymes, being one of a pair of homologous dehydrogenases that act in concert in a single pathway to convert the R- and S-enantiomers of hydroxypropyl-coenzyme M to the achiral ketopropyl-coenzyme M product. Crystallization trials have revealed that the highest diffraction quality crystals (better than 2.0 A resolution) could be achieved when the reaction substrates were added to the enzyme in a stoichiometric excess prior to crystallization.

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