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Serine-rich repeat protein adhesins from Lactobacillus reuteri display strain specific glycosylation profiles

  • Dimitrios Latousakis
  • , Ridvan Nepravishta
  • , Martin Rejzek
  • , Udo Wegmann
  • , Gwenaelle Le Gall
  • , Devon Kavanaugh
  • , Ian Colquhoun
  • , Steven Frese
  • , Donald MacKenzie
  • , Jens Walter
  • , Jesus Angulo
  • , Rob Field
  • , Nathalie Juge (Lead Author)

Research output: Contribution to journal › Article › peer-review

21 Citations (Scopus)
42 Downloads (Pure)

Abstract

Lactobacillus reuteri is a gut symbiont inhabiting the gastrointestinal tract of numerous vertebrates. The surface-exposed Serine-Rich Repeat Protein (SRRP) is a major adhesin in Gram-positive bacteria. Using lectin and sugar nucleotide profiling of wild-type or L. reuteri isogenic mutants, MALDI-ToF-MS, LC-MS and GC-MS analyses of SRRPs, we showed that L. reuteri strains 100-23C (from rodent) and ATCC 53608 (from pig) can perform protein O-glycosylation and modify SRRP100-23 and SRRP53608 with Hex-Glc-GlcNAc and di-GlcNAc moieties, respectively. Furthermore, in vivo glycoengineering in E. coli led to glycosylation of SRRP53608 variants with α-GlcNAc and GlcNAcβ(1→6)GlcNAcα moieties. The glycosyltransferases involved in the modification of these adhesins were identified within the SecA2/Y2 accessory secretion system and their sugar nucleotide preference determined by saturation transfer difference NMR spectroscopy and differential scanning fluorimetry. Together, these findings provide novel insights into the cellular O-protein glycosylation pathways of gut commensal bacteria and potential routes for glycoengineering applications.
Original languageEnglish
Pages (from-to)45-58
Number of pages14
JournalGlycobiology
Volume29
Issue number1
Early online date27 Oct 2018
DOIs
Publication statusPublished - 1 Jan 2019

Keywords

  • Adhesins, Bacterial/chemistry
  • Glycosylation
  • Lactobacillus reuteri/chemistry
  • Mutation
  • Nuclear Magnetic Resonance, Biomolecular
  • Repetitive Sequences, Amino Acid

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