TDP-4-oxo-6-deoxy-alpha-D-glucose-3,4-oxoisomerase (dTDP-3-dehydro-6-deoxy-alpha-D-glucopyranose-forming) (, TDP-4-keto-6-deoxy-D-glucose-3,4-ketoisomerase, Tyl1a, dTDP-4-keto-6-deoxy-D-glucose-3,4-ketoisomerase) is an enzyme with systematic name dTDP-4-dehydro-6-deoxy-alpha-D-glucopyranose:dTDP-3-dehydro-6-deoxy-alpha-D-glucopyranose isomerase. This enzyme catalyses the following chemical reaction
The enzyme is involved in biosynthesis of D-mycaminose.