EC number 4.2.1.46 IntEnz IntEnz view ExPASy NiceZyme view | CAS number 37259-54-4 BRENDA BRENDA entry KEGG KEGG entry | |
In enzymology, a dTDP-glucose 4,6-dehydratase (EC 4.2.1.46) is an enzyme that catalyzes the chemical reaction
Contents
dTDP-glucoseHence, this enzyme has one substrate, dTDP-glucose, and two products, dTDP-4-dehydro-6-deoxy-D-glucose and H2O.
Structure and mechanism of action
The first protein structures of a dTDP-glucose 4,6-dehydratase (RmlB) were completed by Jim Thoden in the Hazel Holden lab (University of Wisconsin–Madison) and Simon Allard in the Jim Naismith lab (University of St Andrews). Further structural, mutagenic, and enzymatic studies by both groups, along with important mechanistic work by the W. Wallace Cleland and Perry Frey groups have led to a good understanding of this enzyme. In brief summary, the enzyme is a dimeric protein with a Rossman fold; it uses the tightly bound coenzyme NAD+ for transiently oxidizing the substrate, activating it for the dehydration step.
Nomenclature
This enzyme belongs to the family of lyases, specifically the hydro-lyases, which cleave carbon-oxygen bonds. The systematic name of this enzyme class is dTDP-glucose 4,6-hydro-lyase (dTDP-4-dehydro-6-deoxy-D-glucose-forming). Other names in common use include thymidine diphosphoglucose oxidoreductase, TDP-glucose oxidoreductase, RmlB, DESIV, and dTDP-glucose 4,6-hydro-lyase. This enzyme participates in 4 metabolic pathways: nucleotide sugars metabolism, streptomycin biosynthesis, polyketide sugar unit biosynthesis, and biosynthesis of vancomycin group antibiotics.