Abstract
During investigation of the interaction of human lactoferrin (HLf) with variou bacteria, it was found that inStreptococcus pyogenes, HLf binding occurred to agar-rather than broth-grown cells irrespective of the nutrients used. Furthermore, binding of HLf to broth-grown, heat-killed bacteria was induced by overnight incubation on agar media or short-time exposure of the cells to water-soluble agar extract. The binding pattern was revealed in most of 92S. pyogenes strains representing various M-or T-types with no apparent type variation. The component thus bridging the attachment of HLf to the streptococcal cell surface was recovered in extracts of agar-grown cells and isolated by affinity chromatography on HLf-sepharose. By gel filtration in the presence of radiolabeled HLf, this component exhibited similar elution position as crude water-soluble agar extract. Chemical analysis identified the active HLf-binding agar component to be a galactose-rich polysaccharide (GRP). Further binding tests showed that the interaction between streptococci and GRP was stable in the presence of high molar NaCl, KSCN, or urea and was unaffected by various serum or matrix proteins or by streptococcal lipoteichoic acid; however, a moderate inhibition by heparin or bovine mucin was observed. Studies on isogenic mutants ofS. pyogenes did not support the involvement of M-protein or the hyaluronate capsule in the binding of GRP. SDS-PAGE and Western blot analyses revealed a GRP-binding protein of approximately 70 kDa in the cell-wall extracts of two strains ofS. pyogenes, types M19 and M55. Finally, the adherence of (broth-grown)3H-thymidine-labeledS. pyogenes, type M19, to the pharyngeal epithelial cell line DT-562 or to normal tonsillar epithelial cells was inhibited by GRP in a dose-related manner. We thus propose that the streptococcal GRP-binding component may represent a novel surface lectin acting as a mucosal adhesin forS. pyogenes, in accordance with previous data indicating that galactosecontaining sugar moieties may serve as ligands for the adherence of streptococci to pharyngeal cells. Our results also indicate that GRP-like components such as mucin or heparin might act to block epithelial adherence ofS. pyogenes at the mucosal level.
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Gerlach, D., Schalén, C., Tigyi, Z. et al. Identification of a novel lectin inStreptococcus pyogenes and its possible role in bacterial adherence to pharyngeal cells. Current Microbiology 28, 331–338 (1994). https://doi.org/10.1007/BF01570197
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DOI: https://doi.org/10.1007/BF01570197