title: The Stringent Response Regulator DksA Is Required for Salmonella enterica Serovar Typhimurium Growth in Minimal Medium, Motility, Biofilm Formation, and Intestinal Colonization.
abstract: Salmonella enterica serovar Typhimurium is a facultative intracellular human and animal bacterial pathogen posing a major threat to public health worldwide. Salmonella pathogenicity requires complex coordination of multiple physiological and virulence pathways. DksA is a conserved Gram-negative regulator that belongs to a distinct group of transcription factors that bind directly to the RNA polymerase secondary channel, potentiating the effect of the signaling molecule ppGpp during a stringent response. Here, we established that in S. Typhimurium, dksA is induced during the logarithmic phase and DksA is essential for growth in minimal defined medium and plays an important role in motility and biofilm formation. Furthermore, we determined that DksA positively regulates the Salmonella pathogenicity island 1 and motility-chemotaxis genes and is necessary for S. Typhimurium invasion of human epithelial cells and uptake by macrophages. In contrast, DksA was found to be dispensable for S. Typhimurium host cell adhesion. Finally, using the colitis mouse model, we found that dksA is spatially induced at the midcecum during the early stage of the infection and required for gastrointestinal colonization and systemic infection in vivo. Taken together, these data indicate that the ancestral stringent response regulator DksA coordinates various physiological and virulence S. Typhimurium programs and therefore is a key virulence regulator of Salmonella.
authors.affiliation: Infectious Diseases Research Laboratory, Sheba Medical Center, Tel-Hashomer, Israel.
authors.forename: Shalhevet
authors.initials: S
authors.lastname: Azriel
authors.affiliation: Infectious Diseases Research Laboratory, Sheba Medical Center, Tel-Hashomer, Israel Department of Clinical Microbiology and Immunology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
authors.forename: Alina
authors.initials: A
authors.lastname: Goren
authors.affiliation: Infectious Diseases Research Laboratory, Sheba Medical Center, Tel-Hashomer, Israel Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
authors.forename: Galia
authors.initials: G
authors.lastname: Rahav
authors.affiliation: Infectious Diseases Research Laboratory, Sheba Medical Center, Tel-Hashomer, Israel Department of Clinical Microbiology and Immunology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel Ohad.Gal-Mor@sheba.health.gov.il.
authors.forename: Ohad
authors.initials: O
authors.lastname: Gal-Mor
mesh_terms: D000818:Animals; D001422:Bacterial Adhesion; D001426:Bacterial Proteins / Q000235:genetics* / Q000378:metabolism; D018441:Biofilms / Q000254:growth & development; D018938:Caco-2 Cells; D002460:Cell Line; D002633:Chemotaxis / Q000235:genetics; D003092:Colitis / Q000276:immunology / Q000382:microbiology / Q000473:pathology*; D003470:Culture Media / Q000737:chemistry; D004847:Epithelial Cells / Q000382:microbiology; D005260:Female; D015964:Gene Expression Regulation, Bacterial; D006801:Humans; D007422:Intestines / Q000382:microbiology*; D008264:Macrophages / Q000276:immunology / Q000382:microbiology; D051379:Mice; D008810:Mice, Inbred C57BL; D012481:Salmonella Infections, Animal / Q000276:immunology / Q000382:microbiology / Q000473:pathology*; D012486:Salmonella typhimurium / Q000235:genetics / Q000254:growth & development* / Q000472:pathogenicity; D014157:Transcription Factors / Q000235:genetics; D037521:Virulence Factors / Q000235:genetics*
chemical_list: D001426:Bacterial Proteins; D003470:Culture Media; C000607818:DksA protein, Salmonella typhimurium; C419942:Spi1 protein, Salmonella; D014157:Transcription Factors; D037521:Virulence Factors