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Infect Immun. 1992 March; 60(3): 899-906

Binding of heparan sulfate to Staphylococcus aureus.

Department of Medical Microbiology, University of Lund, Sweden.

ABSTRACT

Heparan sulfate binds to proteins present on the surface of Staphylococcus aureus cells. Binding of 125I-heparan sulfate to S. aureus was time dependent, saturable, and influenced by pH and ionic strength, and cell-bound 125I-heparan sulfate was displaced by unlabelled heparan sulfate or heparin. Other glycosaminoglycans of comparable size (chondroitin sulfate and dermatan sulfate), highly glycosylated glycoprotein (hog gastric mucin), and some anionic polysaccharides (dextran sulfate and RNA) inhibited heparan sulfate binding to various extents. Heat treatment (80 degrees C for 10 min) and treatment of the bacteria with pronase E, proteinase K, pepsin, and chymotrypsin considerably reduced their ability to bind 125I-heparan sulfate, but treatment with trypsin and neuraminidase did not affect binding. Scatchard plot analysis indicated the presence of cell surface components with low affinity (Kd = 3 x 10(-5) M) for heparan sulfate. Cell surface components were released by stirring bacteria with 1 M LiCl at 37 degrees C for 2 h. Proteins of this extract that competitively inhibited binding of 125I-heparan sulfate to S. aureus were isolated by affinity chromatography on heparin-Sepharose. Two proteins having molecular masses of approximately 66 and 60 kDa and the ability to bind 125I-heparan sulfate were obtained. The first 9 amino-terminal amino acid residues of the 66-kDa protein are Asp-Trp-Thr-Gly-Trp-Leu-Ala-Ala-Ala, and the first 4 amino-terminal amino acid residues of the 60-kDa protein are Met-Leu-Val-Thr.

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