A pyridoxal 5′-phosphate protein. This enzyme participates in the biosynthetic pathway for UDP-¦Á-D-ManNAc3NAcA (UDP-2,3-diacetamido-2,3-dideoxy-¦Á-D-mannuronic acid), an important precursor of B-band lipopolysaccharide. The enzymes from?Pseudomonas aeruginosa?serotype O5 and?Thermus thermophilus?form a complex with the previous enzyme in the pathway, EC?1.1.1.335?(UDP-N-acetyl-2-amino-2-deoxyglucuronate oxidase).