| EC |
3.2.1.184 |
| Accepted name: |
UDP-N,N′-diacetylbacillosamine 2-epimerase (hydrolysing) |
| Reaction: |
UDP-N,N′-diacetylbacillosamine + H2O = UDP + 2,4-diacetamido-2,4,6-trideoxy-D-mannopyranose |
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For diagram of legionaminic acid biosynthesis, click here, and for mechanism, click here |
| Glossary: |
UDP-N,N′-diacetylbacillosamine = UDP-2,4-diacetamido-2,4,6-trideoxy-α-D-glucopyranose |
| Other name(s): |
UDP-Bac2Ac4Ac 2-epimerase; NeuC |
| Systematic name: |
UDP-N,N′-diacetylbacillosamine hydrolase (2-epimerising) |
| Comments: |
Requires Mg2+. Involved in biosynthesis of legionaminic acid, a nonulosonate derivative that is incorporated by some bacteria into assorted virulence-associated cell surface glycoconjugates. The initial product formed by the enzyme from Legionella pneumophila, which incorporates legionaminic acid into the O-antigen moiety of its lipopolysaccharide, is 2,4-diacetamido-2,4,6-trideoxy-α-D-mannopyranose, which rapidly mutarotates to a mixture of anomers [1]. The enzyme from Campylobacter jejuni, which incorporates legionaminic acid into flagellin, prefers GDP-N,N′-diacetylbacillosamine [2]. |
| Links to other databases: |
BRENDA, EXPASY, KEGG, MetaCyc, PDB |
| References: |
| 1. |
Glaze, P.A., Watson, D.C., Young, N.M. and Tanner, M.E. Biosynthesis of CMP-N,N′-diacetyllegionaminic acid from UDP-N,N′-diacetylbacillosamine in Legionella pneumophila. Biochemistry 47 (2008) 3272–3282. [DOI] [PMID: 18275154] |
| 2. |
Schoenhofen, I.C., Vinogradov, E., Whitfield, D.M., Brisson, J.R. and Logan, S.M. The CMP-legionaminic acid pathway in Campylobacter: biosynthesis involving novel GDP-linked precursors. Glycobiology 19 (2009) 715–725. [DOI] [PMID: 19282391] |
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| [EC 3.2.1.184 created 2012] |
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