Isolation and characterization of fibronectin-binding sites of Borrelia garinii N34.

AUTOR(ES)

Kopp, P A

RESUMO

Adherence of bacteria to host cell membranes is one of the initial steps of microbial pathogenicity. Numerous studies have suggested that fibronectin promotes this interaction in some bacterial species. In this study, we have examined the ability of Borrelia garinii to bind fibronectin. The binding of fibronectin to the spirochete was specific and saturable. Scatchard plot analysis of the binding data revealed two types of ligands on the spirochetal surface, one with high affinity and one with low affinity for fibronectin. The fibronectin-binding sites were solubilized from the surface of B. garinii N34 by lysozyme treatment. Fast protein liquid chromatography (FPLC) purification of the solubilized binding sites resulted in one band with a high fibronectin-binding activity and a molecular weight of ca. 147,000. FPLC-purified binding sites, fibronectin, and antibodies to fibronectin inhibited the adherence of the spirochete to epithelial cells competitively. These data provide strong support for the hypothesis that fibronectin-binding sites on the surface of B. garinii are involved in the adherence of the spirochete to their respective host cells.

Documentos Relacionados

• Isolation of a fibronectin-binding protein from Staphylococcus aureus.
• Mapping the Ligand-Binding Region of Borrelia burgdorferi Fibronectin-Binding Protein BBK32
• Treponema pallidum Fibronectin-Binding Proteins
• Characterization of fibronectin-binding antigens released by Mycobacterium tuberculosis and Mycobacterium bovis BCG.
• Fibronectin-binding protein of Streptococcus equi subsp. zooepidemicus.