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Identification of a sialate O-acetyltransferase from Campylobacter jejuni: Demonstration of direct transfer to the C-9 position of terminal α-2,8-linked sialic acid

By R.S. (Scott) Houliston, H.P. (Hubert) Endtz, N. (Nobuhiro) Yuki, J. (Jianjun) Li, H.C. (Harold ) Jarrell, M. (Michiaki) Koga, A.F. (Alex) van Belkum, M.F. Karwaski, W. (Warren) Wakarchuk and M. (Michel) Gilbert


We have identified a sialate O-acetyltransferase in the lipo-oligosaccharide biosynthesis locus of Campylobacter jejuni. Strains possessing this locus are known to produce sialylated outer core structures that mimic host gangliosides, and have been implicated in triggering the onset of Guillain-Barré syndrome. The acetyltransferase, which was cloned and expressed as a fusion construct in Escherichia coli, is soluble and homologous with members of the NodL-LacA-CysE family of O-acetyltransferases. This enzyme catalyzes the transfer of O-acetyl groups onto oligosaccharide-bound sialic acid, with a high specificity for terminal α2,8-linked residues. The modification is directed to C-9 and not C-7 as is believed to occur more commonly in other organisms. Despite their wide prevalence and importance in both eukaryotes and prokaryotes, this is the first report to describe the characterization of a purified sialate O-acetyltransferase

Year: 2006
DOI identifier: 10.1074/jbc.M512183200
OAI identifier: oai:repub.eur.nl:69431
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