IUBMB Enzyme Nomenclature


Accepted name: UDP-N-acetyl-α-D-quinovosamine dehydrogenase

Reaction: UDP-N-acetyl-α-D-quinovosamine + NAD(P)+ = UDP-2-acetamido-2,6-dideoxy-α-D-xylohex-4-ulose + NAD(P)H + H+

Glossary: UDP-N-acetyl-α-D-quinovosamine = UDP-N-acetyl-6-deoxy-α-D-glucosamine

Other name(s): wbpV (gene name); wreQ (gene name)

Systematic name: UDP-N-acetyl-α-D-quinovosamine:NAD(P)+ 4-dehydrogenase

Comments: The enzyme participates in the biosynthesis of N-acetyl-α-D-quinovosamine, a 6-deoxy sugar that is present in the O antigens of many Gram-negative bacteria, including Pseudomonas aeruginosa serotypes O6 and O10, Rhizobium etli, and Brucella abortus.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Belanger, M., Burrows, L.L. and Lam, J.S. Functional analysis of genes responsible for the synthesis of the B-band O antigen of Pseudomonas aeruginosa serotype O6 lipopolysaccharide. Microbiology (Reading) 145 (1999) 3505-3521. [PMID: 10627048]

2. Forsberg, L.S., Noel, K.D., Box, J. and Carlson, R.W. Genetic locus and structural characterization of the biochemical defect in the O-antigenic polysaccharide of the symbiotically deficient Rhizobium etli mutant, CE166. Replacement of N-acetylquinovosamine with its hexosyl-4-ulose precursor. J. Biol. Chem. 278 (2003) 51347-51359. [PMID: 14551189]

3. Li, T., Simonds, L., Kovrigin, E.L. and Noel, K.D. In vitro biosynthesis and chemical identification of UDP-N-acetyl-D-quinovosamine (UDP-D-QuiNAc). J. Biol. Chem. 289 (2014) 18110-18120. [PMID: 24817117]

[EC created 2021]

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