Abstract
Campylobacter jejuni is the one of the leading cause of bacterial food borne gastroenteritis. PglB, a glycosyltransferase, plays a crucial role of mediating glycosylation of numerous periplasmic proteins. It catalyzes N-glycosylation at the sequon D/E-X1-N-X2-S/T in its substrate proteins. Here we report that the PglB itself is a glycoprotein which self-glycosylates at N534 site in its DYNQS sequon by its own catalytic WWDYG motif. Site-directed mutagenesis, lectin Immunoblot, and mobility shift assays confirmed that the DYNQS is an N-glycosylation motif. PglB’s N-glycosylation motif is structurally and functionally similar to its widely studied glycosylation substrate, the OMPH1. Its DYNQS motif forms a solvent-exposed crest. This motif is close to a cluster of polar and hydrophilic residues, which form a loop flanked by two α helices. This arrangement extremely apposite for auto-glycosylation at N534. This self-glycosylation ability of PglB could mediate C. jejuni’s ability to colonize the intestinal epithelium. Further this capability may also bear significance for the development of novel conjugated vaccines and diagnostic tests.
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HB wishes to thank Higher Education Commission of Pakistan for support and Brendan W Wren at LSHTM for providing necessary Plasmid constructs for the study.
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Bokhari, H., Maryam, A., Shahid, R. et al. Oligosaccharyltransferase PglB of Campylobacter jejuni is a glycoprotein. World J Microbiol Biotechnol 36, 9 (2020). https://doi.org/10.1007/s11274-019-2784-9
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DOI: https://doi.org/10.1007/s11274-019-2784-9