title: Scl1, the multifunctional adhesin of group A Streptococcus, selectively binds cellular fibronectin and laminin, and mediates pathogen internalization by human cells.
abstract: The streptococcal collagen-like protein-1, Scl1, is widely expressed by the well-recognized human pathogen group A Streptococcus (GAS). Screening of human ligands for binding to recombinant Scl1 identified cellular fibronectin and laminin as binding partners. Both ligands interacted with the globular domain of Scl1, which is also able to bind the low-density lipoprotein. Native Scl1 mediated GAS adherence to ligand-coated glass cover slips and promoted GAS internalization into HEp-2 cells. This work identifies new ligands of the Scl1 protein that are known to be important in GAS pathogenesis and suggests a novel ligand-switching mechanism between blood and tissue environments, thereby facilitating host colonization and GAS dissemination.
authors.affiliation: Department of Microbiology, Immunology, and Cell Biology, West Virginia University School of Medicine, Morgantown, WV 26506, USA.
authors.forename: Clayton C
authors.initials: CC
authors.lastname: Caswell
authors.forename: Heaven
authors.initials: H
authors.lastname: Oliver-Kozup
authors.forename: Runlin
authors.initials: R
authors.lastname: Han
authors.forename: Ewa
authors.initials: E
authors.lastname: Lukomska
authors.forename: Slawomir
authors.initials: S
authors.lastname: Lukomski
mesh_terms: D018829:Adhesins, Bacterial / Q000378:metabolism*; D001422:Bacterial Adhesion; D001426:Bacterial Proteins / Q000378:metabolism*; D002460:Cell Line; D003094:Collagen / Q000378:metabolism*; D005353:Fibronectins / Q000378:metabolism*; D022781:Hepatocytes / Q000382:microbiology; D006801:Humans; D007797:Laminin / Q000378:metabolism*; D011485:Protein Binding; D054730:Protein Interaction Domains and Motifs; D013297:Streptococcus pyogenes / Q000378:metabolism* / Q000472:pathogenicity*
chemical_list: D018829:Adhesins, Bacterial; D001426:Bacterial Proteins; D005353:Fibronectins; D007797:Laminin; C423454:Scl1 protein, Streptococcus; D003094:Collagen