title: Study of free oligosaccharides derived from the bacterial N-glycosylation pathway.
abstract: The food-borne pathogen Campylobacter jejuni is one of the leading causes of bacterial gastroenteritis worldwide and the most frequent antecedent in neuropathies such as the Guillain-Barré and Miller Fisher syndromes. C. jejuni was demonstrated to possess an N-linked protein glycosylation pathway that adds a conserved heptasaccharide to >40 periplasmic and membrane proteins. Recently, we showed that C. jejuni also produces free heptasaccharides derived from the N-glycan pathway reminiscent of the free oligosaccharides (fOS) produced by eukaryotes. Herein, we demonstrate that C. jejuni fOS are produced in response to changes in the osmolarity of the environment and bacterial growth phase. We provide evidence showing the conserved WWDYG motif of the oligosaccharyltransferase, PglB, is necessary for fOS release into the periplasm. This report demonstrates that fOS from an N-glycosylation pathway in bacteria are potentially equivalent to osmoregulated periplasmic glucans in other Gram-negative organisms.
authors.affiliation: Institute for Biological Sciences, National Research Council, Ottawa, ON, Canada K1A 0R6.
authors.forename: Harald
authors.initials: H
authors.lastname: Nothaft
authors.forename: Xin
authors.initials: X
authors.lastname: Liu
authors.forename: David J
authors.initials: DJ
authors.lastname: McNally
authors.forename: Jianjun
authors.initials: J
authors.lastname: Li
authors.forename: Christine M
authors.initials: CM
authors.lastname: Szymanski
mesh_terms: D016123:Campylobacter jejuni / Q000737:chemistry / Q000378:metabolism*; D006031:Glycosylation; D006602:Hexosyltransferases / Q000235:genetics / Q000378:metabolism; D013058:Mass Spectrometry; D009154:Mutation / Q000235:genetics; D009844:Oligosaccharides / Q000737:chemistry / Q000378:metabolism*; D009997:Osmotic Pressure; D019897:Periplasm / Q000378:metabolism; D011134:Polysaccharides / Q000378:metabolism; D014158:Transcription, Genetic
chemical_list: D009844:Oligosaccharides; D011134:Polysaccharides; D006602:Hexosyltransferases
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