title: Diversification of a Salmonella virulence protein function by ubiquitin-dependent differential localization.
abstract: Many bacterial pathogens and symbionts utilize type III secretion systems to deliver bacterial effector proteins into host cells. These effector proteins have the capacity to modulate a large variety of cellular functions in a highly regulated manner. Here, we report that the phosphoinositide phosphatase SopB, a Salmonella Typhimurium type III secreted effector protein, diversifies its function by localizing to different cellular compartments in a ubiquitin-dependent manner. We show that SopB utilizes the same enzymatic activity to modulate actin-mediated bacterial internalization and Akt activation at the plasma membrane and vesicular trafficking and intracellular bacterial replication at the phagosome. Thus, by exploiting the host cellular machinery, Salmonella Typhimurium has evolved the capacity to broaden the functional repertoire of a virulence factor to maximize its ability to modulate cellular functions.
authors.affiliation: Section of Microbial Pathogenesis, Yale University School of Medicine, 295 Congress Avenue, New Haven, CT 06536, USA.
authors.forename: Jayesh C
authors.initials: JC
authors.lastname: Patel
authors.forename: Karsten
authors.initials: K
authors.lastname: Hueffer
authors.forename: Tukiet T
authors.initials: TT
authors.lastname: Lam
authors.forename: Jorge E
authors.initials: JE
authors.lastname: Galán
mesh_terms: D000199:Actins / Q000378:metabolism; D001426:Bacterial Proteins / Q000378:metabolism*; D054884:Host-Pathogen Interactions; D006801:Humans; D010873:Pinocytosis; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D012480:Salmonella Infections / Q000382:microbiology; D012486:Salmonella typhimurium / Q000378:metabolism / Q000472:pathogenicity; D025801:Ubiquitin / Q000378:metabolism*
chemical_list: D000199:Actins; D001426:Bacterial Proteins; D025801:Ubiquitin; D051057:Proto-Oncogene Proteins c-akt; C489224:SopB protein, Salmonella