title: Genomic and surface proteomic analysis of the canine pathogen Staphylococcus pseudintermedius reveals proteins that mediate adherence to the extracellular matrix.
abstract: Cell wall-associated (CWA) proteins made by Gram-positive pathogens play a fundamental role in pathogenesis. Staphylococcus pseudintermedius is a major animal pathogen responsible for the canine skin disease bacterial pyoderma. Here, we describe the bioinformatic analysis of the family of 18 predicted CWA proteins encoded in the genome of S. pseudintermedius strain ED99 and determine their distribution among a phylogenetically diverse panel of S. pseudintermedius clinical isolates and closely related species of the Staphylococcus intermedius group. In parallel, we employed a proteomic approach to identify proteins presented on the surface of strain ED99 in vitro, revealing a total of 60 surface-localized proteins in one or more phases of growth, including 6 of the 18 genome-predicted CWA proteins. Based on these analyses, we selected two CWA proteins (SpsD and SpsL) encoded by all strains examined and investigated their capacity to mediate adherence to extracellular matrix proteins. We discovered that SpsD and SpsL mediated binding of a heterologous host, Lactococcus lactis, to fibrinogen and fibronectin and that SpsD mediated binding to cytokeratin 10, a major constituent of mammalian skin. Of note, the interaction with fibrinogen was host-species dependent, suggestive of a role for SpsD and SpsL in the host tropism of S. pseudintermedius. Finally, we identified IgG specific for SpsD and SpsL in sera from dogs with bacterial pyoderma, implying that both proteins are expressed during infection. The combined genomic and proteomic approach employed in the current study has revealed novel host-pathogen interactions which represent candidate therapeutic targets for the control of bacterial pyoderma.
authors.affiliation: The Roslin Institute and Centre for Infectious Diseases, University of Edinburgh, Edinburgh, United Kingdom.
authors.forename: Jeanette
authors.initials: J
authors.lastname: Bannoehr
authors.forename: Nouri L
authors.initials: NL
authors.lastname: Ben Zakour
authors.forename: Mark
authors.initials: M
authors.lastname: Reglinski
authors.forename: Neil F
authors.initials: NF
authors.lastname: Inglis
authors.forename: Sabitha
authors.initials: S
authors.lastname: Prabhakaran
authors.forename: Even
authors.initials: E
authors.lastname: Fossum
authors.forename: David G
authors.initials: DG
authors.lastname: Smith
authors.forename: Gillian J
authors.initials: GJ
authors.lastname: Wilson
authors.forename: Robyn A
authors.initials: RA
authors.lastname: Cartwright
authors.forename: Juergen
authors.initials: J
authors.lastname: Haas
authors.forename: Magnus
authors.initials: M
authors.lastname: Hook
authors.forename: Adri H M
authors.initials: AH
authors.lastname: van den Broek
authors.forename: Keith L
authors.initials: KL
authors.lastname: Thoday
authors.forename: J Ross
authors.initials: JR
authors.lastname: Fitzgerald
mesh_terms: D018829:Adhesins, Bacterial / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D001426:Bacterial Proteins / Q000032:analysis* / Q000235:genetics; D002473:Cell Wall / Q000737:chemistry; D019295:Computational Biology; D004285:Dogs; D016326:Extracellular Matrix Proteins / Q000378:metabolism*; D054884:Host-Pathogen Interactions; D020543:Proteome / Q000032:analysis* / Q000235:genetics; D057789:Staphylococcus intermedius / Q000737:chemistry* / Q000235:genetics*
chemical_list: D018829:Adhesins, Bacterial; D001426:Bacterial Proteins; D016326:Extracellular Matrix Proteins; D020543:Proteome