Comparative proteomics and glycoproteomics reveal increased n-linked glycosylation and relaxed sequon specificity in Campylobacter jejuni NCTC11168 O

Nichollas E. Scott, N. Bishara Marzook, Joel A. Cain, Nestor Solis, Morten Thaysen-Andersen, Steven P. Djordjevic, Nicolle H. Packer, Martin R. Larsen, Stuart J. Cordwell*

*Corresponding author for this work

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Campylobacter jejuni is a major cause of bacterial gastroenteritis. C. jejuni encodes a protein glycosylation (Pgl) locus responsible for the N-glycosylation of membrane-associated proteins. We examined two variants of the genome sequenced strain NCTC11168: O, a representative of the original clinical isolate, and GS, a laboratory-adapted relative of O. Comparative proteomics by iTRAQ and two-dimensional liquid chromatography coupled to tandem mass spectrometry (2D-LC-MS/MS) allowed the confident identification of 1214 proteins (73.9% of the predicted C. jejuni proteome), of which 187 were present at statistically significant altered levels of abundance between variants. Proteins associated with the O variant included adhesins (CadF and FlpA), proteases, capsule biosynthesis, and cell shape determinants as well as six proteins encoded by the Pgl system, including the PglK flippase and PglB oligosaccharyltransferase. Lectin blotting highlighted specific glycoproteins more abundant in NCTC11168 O, whereas others remained unaltered. Hydrophilic interaction liquid chromatography (HILIC) and LC-MS/MS identified 30 completely novel glycosites from 15 proteins. A novel glycopeptide from a 14 kDa membrane protein (Cj0455c) was identified that did not contain the C. jejuni N-linked sequon D/E-X-N-X-S/T (X Pro) but that instead contained a sequon with leucine at the-2 position. Occupied atypical sequons were also observed in Cj0958c (OxaA; Gln at the-2 position) and Cj0152c (Ala at the +2 position). The relative O and GS abundances of 30 glycopeptides were determined by label-free quantitation, which revealed a >100-fold increase in the atypical glycopeptide from Cj0455c in isolate O. Our data provide further evidence for the importance of the Pgl system in C. jejuni.

Original languageEnglish
Pages (from-to)5136-5150
Number of pages15
JournalJournal of Proteome Research
Volume13
Issue number11
DOIs
Publication statusPublished - 7 Nov 2014

Keywords

  • Campylobacter jejuni
  • Cj0455c
  • N-linked glycosylation
  • bacterial virulence factors
  • membrane-associated proteins

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