Characterization of the structurally diverse N-linked glycans of Campylobacter species

Adrian J. Jervis, Jonathan A. Butler, Andrew J. Lawson, Rebecca Langdon, Brendan W. Wren, Dennis Linton

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    The Gram-negative bacterium Campylobacter jejuni encodes an extensively characterized N-linked protein glycosylation system that modifies many surface proteins with a heptasaccharide glycan. In C. jejuni, the genes that encode the enzymes required for glycan biosynthesis and transfer to protein are located at a single pgl gene locus. Similar loci are also present in the genome sequences of all other Campylobacter species, although variations in gene content and organization are evident. In this study, we have demonstrated that only Campylobacter species closely related to C. jejuni produce glycoproteins that interact with both a C. jejuni N-linked-glycan-specific antiserum and a lectin known to bind to the C. jejuni N-linked glycan. In order to further investigate the structure of Campylobacter N-linked glycans, we employed an in vitro peptide glycosylation assay combined with mass spectrometry to demonstrate that Campylobacter species produce a range of structurally distinct N-linked glycans with variations in the number of sugar residues (penta-, hexa-, and heptasaccharides), the presence of branching sugars, and monosaccharide content. These data considerably expand our knowledge of bacterial N-linked glycan structure and provide a framework for investigating the role of glycosyltransferases and sugar biosynthesis enzymes in glycoprotein biosynthesis with practical implications for synthetic biology and glycoengineering. © 2012, American Society for Microbiology.
    Original languageEnglish
    Pages (from-to)2355-2362
    Number of pages7
    JournalJournal of Bacteriology
    Issue number9
    Publication statusPublished - May 2012

    Research Beacons, Institutes and Platforms

    • Manchester Institute of Biotechnology


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