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 language | English |
|---|---|
| Journal | Carbohydrate Research |
| Volume | 343 |
| Issue number | 8 |
| Pages (from-to) | 1346-1358 |
| ISSN | 0008-6215 |
| DOIs | |
| Publication status | Published - 2008 |
| Externally published | Yes |
Keywords
- Geobacillus
- Secondary cell wall polymer
- NMR spectroscopy
- Mass spectrometry
- Polysaccharide structure