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• W2745307514 abstract "In Campylobacter jejuni, the PglB oligosaccharyltransferase catalyzes the transfer of a heptasaccharide from a lipid donor to asparagine within the D/E-X1-N–X2-S/T sequon (X1,2 ≠ P) or releases this heptasaccharide as free oligosaccharides (fOS). Using available crystal structures and sequence alignments, we identified a DGGK motif near the active site of PglB that is conserved among all Campylobacter species. We demonstrate that amino acid substitutions in the aspartate and lysine residues result in loss of protein glycosylation in the heterologous Escherichia coli system. Similarly, complementation of a C. jejuni pglB knock-out strain with mutated pglB alleles results in reduced levels of N-linked glycoproteins and fOS in the native host. Analysis of the PglB crystal structures from Campylobacter lari and the soluble C-terminal domain from C. jejuni suggests a particularly important structural role for the aspartate residue and the two following glycine residues, as well as a more subtle, less defined role for the lysine residue. Limited proteolysis experiments indicate that conformational changes of wildtype PglB that are induced by the binding of the lipid-linked oligosaccharide are altered by changes in the DGGK motif. Related to these findings, certain Campylobacter species possess two PglB orthologues and we demonstrate that only the orthologue containing the DGGK motif is active. Combining the knowledge gained from the PglB structures and mutagenesis studies, we propose a function for the DGGK motif in affecting the binding of the undecaprenyl-pyrophosphate glycan donor substrate that subsequently influences N-glycan and fOS production." @default.
• W2745307514 created "2017-08-17" @default.
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• W2745307514 date "2017-08-18" @default.
• W2745307514 modified "2023-10-13" @default.
• W2745307514 title "A conserved DGGK motif is essential for the function of the PglB oligosaccharyltransferase from Campylobacter jejuni" @default.
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• W2745307514 doi "https://doi.org/10.1093/glycob/cwx067" @default.
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• W2745307514 hasPublicationYear "2017" @default.
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