Specifically aminates dTDP-6-deoxy-D-xylohex-3-ulose to form dTDP-D-Fucp3N in the biosynthesis of dTDP-3-acetamido-3,6-dideoxy-alpha-D-galactose, a glycan chain of the S-layer. 2-oxoglutarate + dTDP-3-amino-3,6-dideoxy-alpha-D-galactopyranose = dTDP-3-dehydro-6-deoxy-alpha-D-galactose + L-glutamate Belongs to the DegT/DnrJ/EryC1 family.