IUBMB Enzyme Nomenclature


Accepted name: N,N'-diacetyllegionaminate synthase

Reaction: 2,4-diacetamido-2,4,6-trideoxy-α-D-mannopyranose + phosphoenolpyruvate + H2O = N,N'-diacetyllegionaminate + phosphate

For diagram of reaction click here and mechanism click here.

Glossary: legionaminate = 5,7-diamino-3,5,7,9-tetradeoxy-D-glycero-D-galacto-non-2-ulosonate

Other name(s): neuB (gene name); legI (gene name)

Systematic name: phosphenolpyruvate:2,4-diacetamido-2,4,6-trideoxy-α-D-mannopyranose 1-(2-carboxy-2-oxoethyl)transferase

Comments: Requires a divalent metal such as Mn2+. Isolated from the bacteria Legionella pneumophila and Campylobacter jejuni, where it is involved in the biosynthesis of legionaminic acid, a virulence-associated, cell surface sialic acid-like derivative.

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


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. [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. [PMID: 19282391]

[EC created 2012]

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