Isolation and characterisation of a 17-kDa staphylococcal heparin-binding protein with broad specificity.
A previous study reported the ability of staphylococci to bind heparin and heparin-dependent host growth factors. The present study isolated and identified heparin- and basic fibroblast growth factor (bFGF)-binding surface components of S. epidermidis strain RP12 and S. haemolyticus strain SM 131. The staphylococcal heparin-binding component(s) were purified by affinity chromatography on heparin-Sepharose and a major heparin-binding protein, here designated HBP, was identified by immunoblot in these two coagulase-negative staphylococcal (CNS) species. The HBP was shown to be acidic with an approximate pI of 4.6 and a molecular mass around 17 kDa. The binding of heparin to HBP was inhibited by heparin, fucoidan, pentosan polysulphate and various other sulphated polysaccharides, but not by non-sulphated compounds. However, the purified HBP from both S. epidermidis and S. haemolyticus revealed broad specificity, and also bound bFGF, thrombospondin, von Willebrand factor and, weakly, fibrinogen. The N-terminal sequences of the 17-kDa HBP from S. epidermidis and S. haemolyticus showed only limited identity. Comparison of the first 15 amino acid residues derived from either strain with known sequences in the protein databases revealed no close similarities. Taken together, these results suggest that the adhesion of at least some CNS to host sulphated glycosaminoglycans may be mediated by a previously uncharacterised group of surface proteins.
Fallgren
Corina
C
Department of Infectious Diseases and Medical Microbiology, University of Lund, Sölvegatan 23, S-223 62 Lund, Sweden.
Utt
Meeme
M
Department of Infectious Diseases and Medical Microbiology, University of Lund, Sölvegatan 23, S-223 62 Lund, Sweden.
Ljungh
Åsa
Å
Department of Infectious Diseases and Medical Microbiology, University of Lund, Sölvegatan 23, S-223 62 Lund, Sweden.
D000595:Amino Acid Sequence; D001345:Autoradiography; D001425:Bacterial Outer Membrane Proteins; D002352:Carrier Proteins / Q000737:chemistry / Q000302:isolation & purification* / Q000378:metabolism; D015180:Electrophoresis, Gel, Two-Dimensional; D004591:Electrophoresis, Polyacrylamide Gel; D016222:Fibroblast Growth Factor 2 / Q000145:classification / Q000302:isolation & purification* / Q000378:metabolism; D006493:Heparin / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D015151:Immunoblotting; D008565:Membrane Proteins; D008969:Molecular Sequence Data; D011135:Polysaccharides, Bacterial / Q000378:metabolism; D011485:Protein Binding; D013210:Staphylococcus / Q000378:metabolism*
C428663:17-kDa HBP protein, Staphylococcus; D001425:Bacterial Outer Membrane Proteins; D002352:Carrier Proteins; D008565:Membrane Proteins; D011135:Polysaccharides, Bacterial; D016222:Fibroblast Growth Factor 2; D006493:Heparin