Interaction of concanavalin a with bacterial lipopolysaccharides in agarose gel

K. Baintner, B. Kocsis, Krisztina Kovács, Z. Péterfi, G. Kökény, P. Hamar

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Binding of fluorescein isothiocyanate-labeled concanavalin A to a series of molecular species of lipopolysaccharide (LPS), purified from pathogenic bacteria, was studied via agarose gel precipitation experiments and the results were compared with available structural data.The LPS species could be divided into ConA-reactive and non-reactive ones. Reactivity resided in the O-specific chain of LPS, and binding to the lipid A or core moieties of LPS could not be demonstrated by the present methods. The α-D-glucose or α-D-mannose residues of the repeating O-specific oligosaccharide units appeared to be recognized by ConA, except when blocked by steric hindrance. Specificity of the reaction was verified by inhibition with 2% D-glucose. Binding by bacterium-specific sugar-residues could not be demonstrated.For precipitation to occur, polyvalency was required both for LPS and ConA, and the resulting precipitation appeared to be promoted by hydrophobic interactions between the lipid A moieties of LPS molecules. The LPS species were differently retained by the agarose gel, which can be explained by differences in their micellar structure in aqueous solution. E. coli O83 LPS did not readily diffused in 1% agarose gel, but its precipitation with ConA could be demonstrated either at elevated temperature or mixing it previously with molten agarose (Mancini's arrangement).

Original languageEnglish
Pages (from-to)201-209
Number of pages9
JournalActa Microbiologica et Immunologica Hungarica
Volume58
Issue number3
DOIs
Publication statusPublished - Sep 1 2011

Fingerprint

Sepharose
Lipopolysaccharides
Gels
Lipid A
Bacteria
Glucose
Mannose
Concanavalin A
Fluorescein
Oligosaccharides
Hydrophobic and Hydrophilic Interactions
Escherichia coli
Temperature

Keywords

  • ConA
  • Escherichia coli
  • lipopolysaccharide
  • O-specific chain
  • Salmonella
  • Shigella

ASJC Scopus subject areas

  • Immunology and Microbiology(all)
  • Medicine(all)

Cite this

Interaction of concanavalin a with bacterial lipopolysaccharides in agarose gel. / Baintner, K.; Kocsis, B.; Kovács, Krisztina; Péterfi, Z.; Kökény, G.; Hamar, P.

In: Acta Microbiologica et Immunologica Hungarica, Vol. 58, No. 3, 01.09.2011, p. 201-209.

Research output: Contribution to journalArticle

Baintner, K. ; Kocsis, B. ; Kovács, Krisztina ; Péterfi, Z. ; Kökény, G. ; Hamar, P. / Interaction of concanavalin a with bacterial lipopolysaccharides in agarose gel. In: Acta Microbiologica et Immunologica Hungarica. 2011 ; Vol. 58, No. 3. pp. 201-209.
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