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The O-specific polysaccharides from Phyllobacterium trifolii PETP02(T) LPS contain 3-C-methyl-D-rhamnose

Katarzyna Zamlynska1, Iwona Komaniecka1, Anna Turska-Szewczuk1

  • 1Department of Genetics and Microbiology, Maria Curie-Sklodowska University, Akademicka 19, 20-033 Lublin, Poland.

Carbohydrate Research
|April 29, 2015
PubMed

Insights

The O-specific polysaccharides from Phyllobacterium trifolii contain rhamnose and evalose. Structural analysis revealed distinct linear hexasaccharide and disaccharide repeating units in these bacterial cell surface components.

Area of Science:

  • Carbohydrate Chemistry
  • Bacterial Polysaccharide Structure
  • Microbial Symbiosis

Background:

  • Phyllobacterium trifolii is a microsymbiont of Trifolium pratense (red clover).
  • Lipopolysaccharides (LPS) are crucial components of Gram-negative bacterial outer membranes.
  • O-specific polysaccharides (O-PS) are key determinants of LPS structure and function.

Purpose of the Study:

  • To elucidate the primary structures of the O-specific polysaccharides from Phyllobacterium trifolii PETP02(T).
  • To characterize the repeating units and linkage patterns within the identified O-polysaccharides.

Main Methods:

  • Mild acid hydrolysis of lipopolysaccharide to isolate O-specific polysaccharides.
  • Comprehensive structural analysis using chemical methods, mass spectrometry, and advanced NMR spectroscopy (1D and 2D NMR).
  • Detailed interpretation of NMR data including COSY, TOCSY, NOESY, HSQC, HMQC, and HMBC experiments.

Main Results:

  • Two distinct O-polysaccharides were identified, composed solely of alpha-D-rhamnose and beta-3-C-methyl-D-rhamnose (evalose).
  • The major O-polysaccharide consists of linear hexasaccharide repeating units.
  • A minor O-polysaccharide was characterized by disaccharide repeating units.

Conclusions:

  • The complete primary structures of two O-polysaccharides from Phyllobacterium trifolii PETP02(T) were established.
  • The structural diversity in O-polysaccharides highlights variations in bacterial cell surface composition.
  • This detailed structural information contributes to understanding the molecular interactions in the Phyllobacterium-Trifolium symbiosis.
Keywords:
3-C-MethylrhamnoseEvaloseLipopolysaccharideO-Specific polysaccharidePhyllobacterium trifoliiRhamnose

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