1. HilD and PhoP independently regulate the expression of grhD1, a novel gene required for Salmonella Typhimurium invasion of host cells
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Francisco García-del Portillo, Carolina López, Víctor H. Bustamante, Roberto Rosales-Reyes, Fernando C. Soncini, Pablo García, María M. Banda, Gadea Rico-Pérez, Rubiceli Manzo, and Miguel Cruz
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Salmonella typhimurium ,0301 basic medicine ,HILD/PHOP ,Salmonella ,Virulence Factors ,PATHOGENESIS ,030106 microbiology ,lcsh:Medicine ,VIRULENCE FACTOR ,Biology ,medicine.disease_cause ,Article ,Virulence factor ,Microbiology ,Ciencias Biológicas ,purl.org/becyt/ford/1 [https] ,Mice ,03 medical and health sciences ,chemistry.chemical_compound ,Bacterial Proteins ,Lysogeny broth ,Transcriptional regulation ,medicine ,Animals ,Amino Acid Sequence ,SALMONELLA ENTERICA ,purl.org/becyt/ford/1.6 [https] ,lcsh:Science ,Gene ,Regulation of gene expression ,Multidisciplinary ,TRANSCRIPTIONAL REGULATION ,lcsh:R ,Gene Expression Regulation, Bacterial ,Bioquímica y Biología Molecular ,biology.organism_classification ,Publisher Correction ,Pathogenicity island ,Intestines ,chemistry ,Salmonella enterica ,Host-Pathogen Interactions ,bacteria ,lcsh:Q ,CIENCIAS NATURALES Y EXACTAS ,Transcription Factors - Abstract
When Salmonella is grown in the nutrient-rich lysogeny broth (LB), the AraC-like transcriptional regulator HilD positively controls the expression of genes required for Salmonella invasion of host cells, such as the Salmonella pathogenicity island 1 (SPI-1) genes. However, in minimal media, the two-component system PhoP/Q activates the expression of genes necessary for Salmonella replication inside host cells, such as the SPI-2 genes. Recently, we found that the SL1344-1872 hypothetical gene, located in a S. Typhimurium genomic island, is co-expressed with the SPI-1 genes. In this study we demonstrate that HilD induces indirectly the expression of SL1344-1872 when S. Typhimurium is grown in LB; therefore, we named SL1344-1872 as grhD1 for gene regulated by HilD. Furthermore, we found that PhoP positively controls the expression of grhD1, independently of HilD, when S. Typhimurium is grown in LB or N-minimal medium. Moreover, we demonstrate that the grhD1 gene is required for the invasion of S. Typhimurium into epithelial cells, macrophages and fibroblasts, as well as for the intestinal inflammatory response caused by S. Typhimurium in mice. Thus, our results reveal a novel virulence factor of Salmonella, whose expression is positively and independently controlled by the HilD and PhoP transcriptional regulators. Fil: Banda, María M.. Universidad Nacional Autónoma de México; México Fil: López, María Carolina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Biología Molecular y Celular de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas. Instituto de Biología Molecular y Celular de Rosario; Argentina Fil: Manzo, Rubiceli. Universidad Nacional Autónoma de México; México Fil: Rico Pérez, Gadea. Consejo Superior de Investigaciones Científicas; España Fil: García, Pablo. Consejo Superior de Investigaciones Científicas; España Fil: Rosales Reyes, Roberto. Universidad Nacional Autónoma de México; México Fil: De La Cruz, Miguel A.. Centro Médico Nacional Siglo XXI; México Fil: Soncini, Fernando Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Rosario. Instituto de Biología Molecular y Celular de Rosario. Universidad Nacional de Rosario. Facultad de Ciencias Bioquímicas y Farmacéuticas. Instituto de Biología Molecular y Celular de Rosario; Argentina Fil: García del Portillo, Francisco. Consejo Superior de Investigaciones Científicas; España Fil: Bustamante, Víctor H.. Universidad Nacional Autónoma de México; México
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- 2018
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