Opsonic antibodies to Enterococcus faecalis strain 12030 are directed against lipoteichoic acid

Infection and Immunity
Christian TheilackerJohannes Huebner

Abstract

A teichoic acid (TA)-like polysaccharide in Enterococcus faecalis has previously been shown to induce opsonic antibodies that protect against bacteremia after active and passive immunization. Here we present new data providing a corrected structure of the antigen and the epitope against which the opsonic antibodies are directed. Capsular polysaccharide isolated from E. faecalis strain 12030 by enzymatic digestion of peptidoglycan and chromatography (enzyme-TA) was compared with lipoteichoic acid (LTA) extracted using butanol and purified by hydrophobic-interaction chromatography (BuOH-LTA). Structural determinations were carried out by chemical analysis and nuclear magnetic resonance spectroscopy. Antibody specificity was assessed by enzyme-linked immunosorbent assay and the opsonophagocytosis assay. After alanine ester hydrolysis, there was structural identity between enzyme-TA and BuOH-LTA of the TA-parts of the two molecules. The basic enterococcal LTA structure was confirmed: 1,3-poly(glycerol phosphate) nonstoichiometrically substituted at position C-2 of the glycerol residues with d-Ala and kojibiose. We also detected a novel substituent at position C-2, [D-Ala-->6]-alpha-D-Glcp-(1-->2-[D-Ala-->6]-alpha-D-Glcp-1-->). Anti...Continue Reading

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Related Concepts

LTA-2
Antibodies, Bacterial
Antibody Specificity
Antigens, Bacterial
Carbohydrate Sequence
Immune Sera
Lipopolysaccharides
Opsonin
Polysaccharides, Bacterial
Enterococcus faecalis

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