title: Role of M3 protein in the adherence and internalization of an invasive Streptococcus pyogenes strain by epithelial cells.
abstract: Streptococcus pyogenes utilizes multiple mechanisms for adherence to and internalization by epithelial cells. One of the molecules suggested of being involved in adherence and internalization is the M protein. Although strains of the M3 serotype form the second largest group isolated from patients with severe invasive diseases and fatal infections, not much information is known regarding the interactions of M3 protein with mammalian cells. In this study we have constructed an emm3 mutant of an invasive M3 serotype (SP268), and demonstrated that the M3 protein is involved in both adherence to and internalization by HEp-2 cells. Fibronectin promoted both adherence and internalization of SP268 in an M3-independent pathway. Utilizing speB and speB/emm3 double mutants, it was found that M3 protein is not essential for the maturation of SpeB, as was reported for the M1 protein. Increased internalization efficiency observed in both the speB and emm3/speB mutants suggested that inhibition of S. pyogenes internalization by SpeB is not related to the presence of an intact M3 protein. Thus, other proteins in SP268, which serve as targets for SpeB activity, have a prominent role in the internalization process.
authors.affiliation: Department of Human Microbiology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 69978, Israel.
authors.forename: Osnat
authors.initials: O
authors.lastname: Eyal
authors.forename: Jeries
authors.initials: J
authors.lastname: Jadoun
authors.forename: Arcady
authors.initials: A
authors.lastname: Bitler
authors.forename: Ehud
authors.initials: E
authors.lastname: Skutelski
authors.forename: Shlomo
authors.initials: S
authors.lastname: Sela
mesh_terms: D018829:Adhesins, Bacterial / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D000942:Antigens, Bacterial; D001422:Bacterial Adhesion / Q000502:physiology*; D016667:Bacterial Capsules; D001425:Bacterial Outer Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D001426:Bacterial Proteins / Q000235:genetics / Q000378:metabolism; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D003546:Cysteine Endopeptidases / Q000235:genetics / Q000378:metabolism; D004847:Epithelial Cells / Q000382:microbiology*; D005353:Fibronectins / Q000378:metabolism / Q000494:pharmacology; D005798:Genes, Bacterial / Q000235:genetics; D006801:Humans; D006820:Hyaluronic Acid / Q000032:analysis; D017384:Sequence Deletion; D013290:Streptococcal Infections / Q000382:microbiology; D013297:Streptococcus pyogenes / Q000737:chemistry* / Q000472:pathogenicity*
chemical_list: D018829:Adhesins, Bacterial; D000942:Antigens, Bacterial; D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D002352:Carrier Proteins; D005353:Fibronectins; C014689:streptococcal M protein; D006820:Hyaluronic Acid; D003546:Cysteine Endopeptidases; C042477:streptopain