C6 dehydratase involved in the bacillosamine biosynthesis pathway by generating UDP-2-acetamido-2,6-dideoxy-alpha-D-xylo-4-hexulose from UDP-N-acetyl-alpha-D-glucosamine. Involved in the N-linked protein glycosylation pathway. UDP-N-acetyl-alpha-D-glucosamine = H2O + UDP-2-acetamido-2,6-dideoxy-alpha-D-xylo-hex-4-ulose Protein modification; protein glycosylation. Belongs to the polysaccharide synthase family.