title: Identification of a novel glycoprotein-binding activity in Streptococcus pyogenes regulated by the mga gene.
abstract: The interaction between Streptococcus pyogenes and the host cell surface is not completely understood. Characterization of the adhesion mechanisms of the bacterium to the host cell surface is needed in order to develop new vaccines and anti-adhesion drugs. The presence of glycoprotein-binding activities among streptococcal strains was investigated. An activity binding to thyroglobulin, fetuin, asialofetuin and mucin but not non-glycosylated proteins was found to be present in the majority of the S. pyogenes strains studied. Cross-inhibition experiments suggested that the glycoproteins share a common structure recognized by the bacteria. The glycoprotein-binding activity was found to be proteinaceous, tightly attached to the bacterial surface and it also mediated the adherence of bacteria to solid surfaces coated with glycoproteins. The activity was found by transposon mutagenesis and complementation to be regulated by the multiple-gene regulator Mga, which has been implicated as a regulator of S. pyogenes virulence factors.
authors.affiliation: Department of Medical Biochemistry, University of Turku, Kiinamyllynkatu 10, FIN-20520 Turku, Finland1.
authors.forename: Jukka
authors.initials: J
authors.lastname: Hytönen
authors.affiliation: Department of Medical Biochemistry, University of Turku, Kiinamyllynkatu 10, FIN-20520 Turku, Finland1.
authors.forename: Sauli
authors.initials: S
authors.lastname: Haataja
authors.affiliation: Department of Medical Biochemistry, University of Turku, Kiinamyllynkatu 10, FIN-20520 Turku, Finland1.
authors.forename: Pia
authors.initials: P
authors.lastname: Isomäki
authors.affiliation: Department of Medical Biochemistry, University of Turku, Kiinamyllynkatu 10, FIN-20520 Turku, Finland1.
authors.forename: Jukka
authors.initials: J
authors.lastname: Finne
mesh_terms: D001422:Bacterial Adhesion; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism*; D018914:Cells, Immobilized / Q000378:metabolism; D003001:Cloning, Molecular; D004251:DNA Transposable Elements; D015964:Gene Expression Regulation, Bacterial; D005816:Genetic Complementation Test; D006023:Glycoproteins / Q000378:metabolism*; D006801:Humans; D016254:Mutagenesis, Insertional; D017422:Sequence Analysis, DNA; D013290:Streptococcal Infections / Q000382:microbiology; D013297:Streptococcus pyogenes / Q000235:genetics / Q000378:metabolism / Q000472:pathogenicity*; D013954:Thyroglobulin / Q000378:metabolism; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism; D014357:Trypsin / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D004251:DNA Transposable Elements; D006023:Glycoproteins; D014157:Transcription Factors; C068267:mry protein, Streptococcus pyogenes; D013954:Thyroglobulin; D014357:Trypsin