Aminotransferase involved in the bacillosamine biosynthesis pathway by producing UDP-4-amino-4,6-dideoxy-alpha-D-GlcNAc (UDP-2-acetamido-4-amino-2,4,6-trideoxy-alpha-D-glucopyranose), a precursor used in the production of the glycan component 2,4-diacetamido-2,4,6-trideoxy-alpha-D-glucopyranose. Required for host colonization and virulence. Involved in the N-linked protein glycosylation pathway. 2-oxoglutarate + UDP-N-acetylbacillosamine = L-glutamate + UDP-2-acetamido-2,6-dideoxy-alpha-D-xylo-hex-4-ulose kcat is 144 min(-1) (PubMed:16286454). kcat is 14.9 min(-1) (PubMed:16690622). Protein modification; protein glycosylation. Cells are impaired for flagella-mediated motility, for invasion of intestinal epithelial cells and for persistence in the chicken intestine. Belongs to the DegT/DnrJ/EryC1 family.