title: Isolation and characterization of a putative collagen receptor from Staphylococcus aureus strain Cowan 1.
abstract: In a previous study we demonstrated that cells of Staphylococcus aureus strain Cowan bind 125I-collagen in a receptor-ligand type of interaction (Speziale, P., Raucci, G., Visai, L., Switalski, L.M., Timpl, R., and Höök, M. (1986) J. Bacteriol. 167, 77-81). In the present communication we report on the isolation and preliminary characterization of a putative collagen receptor from a lysate of S. aureus strain Cowan. Antibodies raised against a collagen receptor positive strain inhibit the binding of 125I-collagen to bacterial cells, whereas antibodies raised against a collagen receptor negative strain were without effect. Solubilized cell surface components did not exhibit any measurable affinity for collagen-Sepharose. However, the inhibitory effect of the antibodies against bacterial cells was neutralized by the lysate from a receptor-positive but not receptor-negative strain. A collagen receptor assay was designed based on this observation and used to develop a receptor purification protocol involving anion exchange chromatography, ammonium sulfate precipitation, and gel chromatography. Using this procedure a protein with an apparent Mr of 135,000 was purified. This protein which was present on a collagen receptor-positive strain but not on a receptor-negative strain could completely neutralize the inhibitory activity of the antibodies raised against S. aureus strain Cowan. Furthermore, antibodies raised against the 135-kDa protein inhibited the binding of collagen to bacteria, and this protein is tentatively identified as a collagen receptor.
authors.affiliation: Department of Microbiology, University of Alabama, Birmingham 35294.
authors.forename: L M
authors.initials: LM
authors.lastname: Switalski
authors.forename: P
authors.initials: P
authors.lastname: Speziale
authors.forename: M
authors.initials: M
authors.lastname: Höök
mesh_terms: D000906:Antibodies; D015153:Blotting, Western; D002352:Carrier Proteins / Q000302:isolation & purification; D002462:Cell Membrane / Q000378:metabolism; D002850:Chromatography, Gel; D003094:Collagen / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D007140:Immunoglobulin Fab Fragments; D007700:Kinetics; D008970:Molecular Weight; D011956:Receptors, Cell Surface / Q000302:isolation & purification* / Q000378:metabolism; D038981:Receptors, Collagen; D013211:Staphylococcus aureus / Q000378:metabolism*
chemical_list: D000906:Antibodies; D002352:Carrier Proteins; D007140:Immunoglobulin Fab Fragments; D011956:Receptors, Cell Surface; D038981:Receptors, Collagen; D003094:Collagen