Involved in the biosynthesis of dTDP-alpha-D-desosamine, a sugar found in several bacterial macrolide antibiotics. Catalyzes the reversible transfer of the amino group from L-glutamate to the C-3 position of dTDP-3-keto-4,6-deoxyglucose to yield dTDP-3-amino-3,4,6-trideoxyglucose. 2-oxoglutarate + dTDP-3-amino-3,4,6-trideoxy-alpha-D-glucose = dTDP-3-dehydro-4,6-dideoxy-alpha-D-glucose + L-glutamate Antibiotic biosynthesis. Homodimer. Belongs to the degT/dnrJ/eryC1 family.