PloS one, 2013-09, Vol.8 (9), p.e74718-e74718
2013
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Details
- Autor(en) / Beteiligte
- Titel
- Protective activity of the CnaBE3 domain conserved among Staphylococcus aureus Sdr proteins
- Ist Teil von
- PloS one, 2013-09, Vol.8 (9), p.e74718-e74718
- Ort / Verlag
- United States: Public Library of Science
- Erscheinungsjahr
- 2013
- Quelle
- MEDLINE
- Beschreibungen/Notizen
- Staphylococcus aureus is an opportunistic pathogen, commensal of the human skin and nares, but also responsible for invasive nosocomial as well as community acquired infections. Staphylococcus aureus adheres to the host tissues by means of surface adhesins, such as SdrC, SdrD, and SdrE proteins. The Sdr family of proteins together with a functional A domain, contain respectively two, three or five repeated sequences called B motifs which comprise the CnaB domains. SdrD and SdrE proteins were reported to be protective in animal models against invasive diseases or lethal challenge with human clinical S. aureus isolates. In this study we identified a 126 amino acid sequence containing a CnaB domain, conserved among the three Sdr proteins. The three fragments defined here as CnaBC2, D5 and E3 domains even though belonging to phylogenetically distinct strains, displayed high sequence similarity. Based on the sequence conservation data, we selected the CnaBE3 domain for further analysis and characterization. Polyclonal antibodies raised against the recombinant CnaBE3 domain recognized SdrE, SdrC and SdrD proteins of different S. aureus lineages. Moreover, we demonstrated that the CnaBE3 domain was expressed in vivo during S. aureus infections, and that immunization of this domain alone significantly reduces the bacterial load in mice challenged with S. aureus. Furthermore, we show that the reduction of bacteria by CnaBE3 vaccination is due to functional antibodies. Finally, we demonstrated that the region of the SdrE protein containing the CnaBE3 domain was resistant to trypsin digestion, a characteristic often associated with the presence of an isopeptide bond.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 1932-6203eISSN: 1932-6203DOI: 10.1371/journal.pone.0074718Titel-ID: cdi_plos_journals_1433332052
- Format
- –
- Schlagworte
- Adhesins, Adhesins, Bacterial - chemistry, Adhesins, Bacterial - genetics, Adhesins, Bacterial - immunology, Adhesins, Bacterial - metabolism, Amino Acid Sequence, Amino acids, Analysis, Animal models, Animal tissues, Animals, Antibodies, Antibodies, Bacterial - immunology, Antibody Specificity - immunology, Antibody-Dependent Cell Cytotoxicity, Bacteria, Bacterial Load, Bacterial Proteins - chemistry, Bacterial Proteins - genetics, Bacterial Proteins - immunology, Bacterial Proteins - metabolism, Bioinformatics, Conservation, Conserved Sequence, Female, Health aspects, Hospitals, Humans, Immunization, Immunoglobulins, Infection, Mice, Molecular Sequence Data, Next-generation sequencing, Nosocomial infection, Opportunist infection, Pathogens, Phylogenetics, Phylogeny, Polyclonal antibodies, Protein Interaction Domains and Motifs - genetics, Protein Interaction Domains and Motifs - immunology, Proteins, Sequence Alignment, Skin, Staphylococcal Infections - microbiology, Staphylococcus aureus, Staphylococcus aureus - classification, Staphylococcus aureus - genetics, Staphylococcus aureus - metabolism, Staphylococcus aureus infections, Staphylococcus infections, Streptococcus infections, Trypsin, Vaccination, Vaccines