title: Quantitative proteomic identification of host factors involved in the Salmonella typhimurium infection cycle.
abstract: To identify host factors involved in Salmonella replication, SILAC-based quantitative proteomics was used to investigate the interactions of Salmonella typhimurium with the secretory pathway in human epithelial cells. Protein profiles of Golgi-enriched fractions isolated from S. typhimurium-infected cells were compared with those of mock-infected cells, revealing significant depletion or enrichment of 105 proteins. Proteins annotated to play a role in membrane traffic were overrepresented among the depleted proteins whereas proteins annotated to the cytoskeleton showed a diverse behavior with some proteins being enriched, others being depleted from the Golgi fraction upon Salmonella infection. To study the functional relevance of identified proteins in the Salmonella infection cycle, small interfering RNA (siRNA) experiments were performed. siRNA-mediated depletion of a selection of affected proteins identified five host factors involved in Salmonella infection. Depletion of peroxiredoxin-6 (PRDX6), isoform β-4c of integrin β-4 (ITGB4), isoform 1 of protein lap2 (erbin interacting protein; ERBB2IP), stomatin (STOM) or TBC domain containing protein 10b (TBC1D10B) resulted in increased Salmonella replication. Surprisingly, in addition to the effect on Salmonella replication, depletion of STOM or ITGB4 resulted in a dispersal of intracellular Salmonella microcolonies. It can be concluded that by using SILAC-based quantitative proteomics we were able to identify novel host cell proteins involved in the complex interplay between Salmonella and epithelial cells.
authors.affiliation: Department of Biochemistry and Cell Biology, Biochemistry Division, Utrecht University, Utrecht, The Netherlands. mijke.vogels@gmail.com
authors.forename: Mijke W
authors.initials: MW
authors.lastname: Vogels
authors.forename: Bas W M
authors.initials: BW
authors.lastname: van Balkom
authors.forename: Albert J R
authors.initials: AJ
authors.lastname: Heck
authors.forename: Cornelis A M
authors.initials: CA
authors.lastname: de Haan
authors.forename: Peter J M
authors.initials: PJ
authors.lastname: Rottier
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Batenburg
authors.forename: Dora V
authors.initials: DV
authors.lastname: Kaloyanova
authors.forename: J Bernd
authors.initials: JB
authors.lastname: Helms
mesh_terms: D004847:Epithelial Cells / Q000378:metabolism / Q000382:microbiology*; D006056:Golgi Apparatus / Q000378:metabolism / Q000382:microbiology; D006367:HeLa Cells; D054884:Host-Pathogen Interactions; D006801:Humans; D039663:Integrin beta4 / Q000235:genetics / Q000378:metabolism; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism; D020543:Proteome / Q000235:genetics / Q000378:metabolism*; D034741:RNA, Small Interfering / Q000235:genetics; D012480:Salmonella Infections / Q000235:genetics / Q000378:metabolism*; D012486:Salmonella typhimurium / Q000166:cytology / Q000502:physiology*
chemical_list: C059834:ITGB4 protein, human; D039663:Integrin beta4; D008565:Membrane Proteins; D020543:Proteome; D034741:RNA, Small Interfering; C036860:STOM protein, human