Structural characterization of the acid-degraded secondary cell wall polymer of Geobacillus stearothermophilus PV72/p2

  • Bent O. Petersen
  • , Margit Sára
  • , Christoph Mader
  • , Harald F. Mayer
  • , Uwe B. Sleytr
  • , Martin Pabst
  • , Michael Puchberger
  • , Eberhard Krause
  • , Andreas Hofinger
  • , Jens Øllgaard Duus
  • , Paul Kosma

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The secondary cell wall polymer (SCWP) from Geobacillus stearothermophilus PV72/p2, which is involved in the anchoring of the surface-layer protein to the bacterial cell wall layer, is composed of 2-amino-2-deoxy- and 2-acetamido-2-deoxy-d-glucose, 2-acetamido-2-deoxy-d-mannose, and 2-acetamido-2-deoxy-d-mannuronic acid. The primary structure of the acid-degraded polysaccharide—liberated by HF-treatment from the cell wall—was determined by high-field NMR spectroscopy and mass spectrometry using N-acetylated and hydrolyzed polysaccharide derivatives as well as Smith-degradation. The polysaccharide was shown to consist of a tetrasaccharide repeating unit containing a pyruvic acid acetal at a side-chain 2-acetamido-2-deoxy-α-d-mannopyranosyl residue. Substoichiometric substitutions of the repeating unit were observed concerning the degree of N-acetylation of glucosamine residues and the presence of side-chain linked 2-acetamido-2-deoxy-β-d-glucopyranosyl units:
Original languageEnglish
JournalCarbohydrate Research
Volume343
Issue number8
Pages (from-to)1346-1358
ISSN0008-6215
DOIs
Publication statusPublished - 2008
Externally publishedYes

Keywords

  • Geobacillus
  • Secondary cell wall polymer
  • NMR spectroscopy
  • Mass spectrometry
  • Polysaccharide structure

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