Biosynthesis of ganglioside mimics in Campylobacter jejuni OH4384. Identification of the glycosyltransferase genes, enzymatic synthesis of model compounds, and characterization of nanomole amounts by 600-mhz (1)h and (13)c NMR analysis: J.Biol.Chem.

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TypeArticle
Journal titleJournal Of Biological Chemistry
Volume275
Issue6
Pages38963906; # of pages: 11
SubjectACID; Amino Acid Sequence; analysis; bacterial; biosynthesis; BOND; Campylobacter; Campylobacter Infections; Campylobacter jejuni; Canada; Carbohydrate Sequence; chemistry; Cloning,Molecular; ENCODES; ENZYMATIC-SYNTHESIS; enzymology; Escherichia; Escherichia coli; ESCHERICHIA-COLI; FRAME; Galactose; GANGLIOSIDE; Gangliosides; GENE; Genes; genetics; glycosidic bond; Glycosyltransferases; GRADIENT; Guillain-Barre Syndrome; IDENTIFICATION; In Vitro; inverse; lipooligosaccharide; LIPOPOLYSACCHARIDE; Lipopolysaccharides; Magnetic Resonance Spectroscopy; Microbiology; MODEL; Molecular Sequence Data; NMR; NMR analysis; Nucleotide Sequence; oligosaccharide; Oligosaccharides; Open Reading Frames; ORGANIZATION; POTENTIAL; REGION; Role; SEQUENCE; Sequence Alignment; SIALIC; SIALIC-ACID; Sialyltransferases; SPECIFICITY; Spectrum Analysis,Mass; STRAIN; STRAINS; Syndrome; Synthesis; synthetic; transfer
AbstractWe have applied two strategies for the cloning of four genes responsible for the biosynthesis of the GT1a ganglioside mimic in the lipooligosaccharide (LOS) of a bacterial pathogen, Campylobacter jejuni OH4384, which has been associated with Guillain-Barre syndrome. We first cloned a gene encoding an alpha-2, 3-sialyltransferase (cst-I) using an activity screening strategy. We then used nucleotide sequence information from the recently completed sequence from C. jejuni NCTC 11168 to amplify a region involved in LOS biosynthesis from C. jejuni OH4384. The LOS biosynthesis locus from C. jejuni OH4384 is 11.47 kilobase pairs and encodes 13 partial or complete open reading frames, while the corresponding locus in C. jejuni NCTC 11168 spans 13.49 kilobase pairs and contains 15 open reading frames, indicating a different organization between these two strains. Potential glycosyltransferase genes were cloned individually, expressed in Escherichia coli, and assayed using synthetic fluorescent oligosaccharides as acceptors. We identified genes encoding a beta-1, 4-N-acetylgalactosaminyl-transferase (cgtA), a beta-1, 3-galactosyltransferase (cgtB), and a bifunctional sialyltransferase (cst-II), which transfers sialic acid to O-3 of galactose and to O-8 of a sialic acid that is linked alpha-2,3- to a galactose. The linkage specificity of each identified glycosyltransferase was confirmed by NMR analysis at 600 MHz on nanomole amounts of model compounds synthesized in vitro. Using a gradient inverse broadband nano-NMR probe, sequence information could be obtained by detection of (3)J(C,H) correlations across the glycosidic bond. The role of cgtA and cst-II in the synthesis of the GT1a mimic in C. jejuni OH4384 were confirmed by comparing their sequence and activity with corresponding homologues in two related C. jejuni strains that express shorter ganglioside mimics in their LOS
Publication date
LanguageEnglish
AffiliationNRC Institute for Biological Sciences; National Research Council Canada
Peer reviewedNo
NRC numberGILBERT2000
NPARC number9378858
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Record identifier81d50130-75ac-4a6f-855b-d7c153e70bac
Record created2009-07-10
Record modified2016-05-09
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