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Salmonella Typhimurium ATCC14028 fimZ mutant

ABSTRACT: Fimbriae are hair-like structures present on the outer membrane of many Enterobacteriaceae and such appendages are proposed to play a significant role in the attachment of the bacteria to host cells and tissues. Salmonella enterica serovar Typhimurium has the potential to produce 13 different fimbrial types, among which type 1 fimbriae is the most common found. Expression of type 1 fimbriae is cooperatively controlled by fimZ, fimY, stm0551, fimW, and fimU within the fim gene cluster. FimZ belongs to the response regulator of the two-component regulatory system in bacteria and functions as a DNA binding protein. FimZ is a positive regulator for type 1 fimbrial expression in S. Typhimurium. A fimZ mutant in ATCC 14028 strain constructed by allelic exchange did not produce type 1 fimbriae. Total RNA was extracted from the parental ATCC 14028 and its fimZ mutant cultured in static broth and analyzed by hybridization to a S. Typhimurium LT2 DNA microarray. Transcriptomic analysis indicated that the type 1 fimbriae related genes, multidrug efflux protein gene acrF were down-regulated, whereas flagella associated genes, chemotaxis and virulence genes such as invF and invH genes were up-regulated in the fimZ mutant strain. It is possible that FimZ protein may play a role to interact with other genes besides regulating type 1 fimbriae.

ORGANISM(S): Salmonella enterica subsp. enterica serovar Typhimurium str. LT2

PROVIDER: GSE102575 | GEO | 2017/08/12

SECONDARY ACCESSION(S): PRJNA398056

REPOSITORIES: GEO

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Salmonella Typhimurium fimZ mutant

Project description:Salmonella enterica serovar Typhimurium produces type 1 fimbriae on the outer membrane and such hair-like appendages is proposed to play a significant role in the attachment of the bacteria to host cells and tissues. S. Typhimurium cultured in static broth favors expression of type 1 fimbriae. Conversely, solid agar medium represses type 1 fimbrial expression. Production of type 1 fimbriae is cooperatively regulated by fimZ, fimY, stm0551, fimW, and fimU within the fim gene cluster. FimZ belongs to the response regulator of the two-component regulatory system in bacteria and functions as a DNA binding protein. FimZ can bind to the promoter of the fimbrial major subunit gene fimA to activate its expression and produce type 1 fimbriae. A fimZ mutant in LB5010 strain constructed by allelic exchange was found to be non-fimbriate. Total RNA was extracted from the parental LB5010 and the fimZ mutant strain cultured in static broth and analyzed by hybridization to a S. Typhimurium LT2 DNA microarray. Transcriptomic analysis indicated that the stress response related gene cpxP, soxS and type 1 fimbriae related genes were down-regulated, whereas plasmid-encoded fimbriae, flagella associated genes and virulence genes like virK and mgtC were up-regulated in the fimZ mutant strain. It is possible that FimZ protein may play a role to interact with other genes besides fim genes. Mechanisms of this crosstalk warrant further elucidation.

2017-01-20 | GSE93882 | GEO

Salmonella Typhimurium stbC mutant

Project description:Salmonella enterica serotype Typhimurium produces a variety of fimbrial appendages, among which the type 1 fimbriae is the most common type. In vitro static broth culture favors S. Typhimurium to produce type 1 fimbriae, while solid agar inhibits its expression. A transposon inserted in the stbC gene, which would encode an usher protein for Stb fimbriae of a non-flagellar S. Typhimurium LB5010 strain, conferred it to agglutinate yeast cells on both cultures, and was mannose-sensitive. Reverse transcription polymerase chain reaction (RT-PCR) revealed that the expression of the fimbrial major subunit gene fimA, and fimZ, a positive regulator gene of fimA, were both increased in the stbC mutant strain when grown on LB agar; fimW, a repressor gene of fimA, exhibited lower expression. Flagella were observed in the stbC mutant and this phenotype was correlated with the motile phenotype detected by MSRV agar medium and reaction with flagella antiserum. Microarray data and RT-PCR also indicated that the expression of three genes, motA, motB, and cheM, was enhanced in the stbC mutant. The S. Typhimurium stbC mutant was resistant to a variety of antibiotics, consistent with the finding that expression of yhcQ and ramA, two genes involved in multidrug resistance, was enhanced. A complementation test revealed that transforming a recombinant plasmid possessing the coding sequence of the stbC gene restored the mannose-sensitive agglutination phenotype to the stbC mutant much as that in the parental S. Typhimurium LB5010 strain, indicating the possibility of an interplay of different fimbrial systems in coordinating their expression. Key Words: Salmonella enterica serotype Typhimurium, fimbriae, type 1 fimbriae, stbC, transposon, multidrug resistant, flagella RNA transcript of Salmonella Typhimurium LB5010 strain comparing wild-type with stbC mutant. Two-cindition experiment, wild-type vs. stbC mutant strain.

2011-12-25 | E-GEOD-34685 | biostudies-arrayexpress

Salmonella Typhimurium stbC mutant

2011-12-25 | GSE34685 | GEO

14028 cheY mutant time course expression on plate

Project description:time course of transcriptional profile of Typhimurium 14028 wt versus 14028 cheY mutant on agar plate Keywords: time-course

2005-08-23 | GSE2340 | GEO

Expression analysis of Salmonella enterica serovar Typhimurium 14028 delta GidA mutant

Project description:Investigation of whole genome gene expression level changes in a Salmonella enterica serovar Typhimurium 14028 delta GidA mutant The mutant described in this study is further analyzed in Shippy, D. C., N. M. Eakley, P. N. Bochsler, and A. A. Fadl. 2011. Biological and virulence characteristics of Salmonella enterica serovar Typhimurium following deletion of glucose-inhibited division (gidA) gene. Microb Pathog. A single chip study using three separate cultures of wild-type Salmonella enterica serovar Typhimurium 14028 and three separate cultures of a single mutant, delta GidA Salmonella enterica serovar Typhimurium 14028.

2011-07-19 | E-GEOD-30787 | biostudies-arrayexpress

Salmonella enterica subsp. enterica serovar Typhimurium

Project description:Salmonella Typhimurium fimZ mutant

| PRJNA362647 | ENA

Gene expression profile in patients inoculated with Escherichia coli 83972

Project description:Mucosal surfaces provide ideal living conditions for the normal flora but paradoxically, they also serve as attack sites for numerous bacterial pathogens that cause extensive morbidity and mortality. Understanding this dichotomy is critical for efforts to selectively target and remove pathogens without disturbing the commensal flora or its protective effects. The complex nature of disease predicts that virulence is multifaceted and that pathogens need multiple virulence factors to initiate tissue attack, disrupt immune homeostasis and create symptoms and pathology. The urinary tract supports ABU; a commensal-like state, which has been shown to prevent super-infection with more virulent strains. To reproduce this protective effect, we have established a protocol to create ABU, by inoculation with the ABU strain E. coli 83972. The therapeutic efficacy and safety of this procedure has been documented in placebo-controlled studies in patients with incomplete bladder voiding. Genome sequencing of E. coli 83972 has revealed a general “loss of virulence” phenotype, which includes fimbrial genes. E. coli 83972 lacks functional P or type 1 fimbriae, due to attenuating point mutations in the papG adhesin gene and a large, inactivating deletion in the fim gene cluster. Both fimbrial types have been proposed to enhance bacterial persistence in the urinary tract. In an attempt to increase the efficiency of E. coli 83972 inoculation and extend its use to include UTI-prone patients with complete bladder voiding, we restored P- and type 1-fimbrial expression and addressed how fimbriae affect the gene expression in inoculated human hosts.

2019-03-20 | GSE128557 | GEO

Expression data of enterohemorrhagic E. coli (EHEC) fimbrial mutants

Project description:Fimbriae are important virulence traits that promote bacterial adhernece to surfaces. Here, we assessed whether fimbriae modulate gene expression using microarrays. We used microarrays to compare gene expression in wild-type of fimbrial deletion strains of EHEC

2024-06-07 | GSE100200 | GEO

Salmonella enterica subsp. enterica serovar Typhimurium str. LT2

Project description:Salmonella Typhimurium ATCC14028 fimZ mutant

| PRJNA398056 | ENA

Role of σ54 in the regulation of genes involved in biogenesis of type I and type IV pili in Xylella fastidiosa

Project description:The phytopathogen Xylella fastidiosa produces two classes of pili, long type IV pili and short type I pili, which are involved in motility and adhesion. In this work, we have investigated the role of σ54 factor and its involvement in the regulation of fimbrial biogenesis in X. fastidiosa. An rpoN null mutant was constructed from citrus strain J1a12, and analyses of global gene expression profile by microarrays comparing the wild type and rpoN mutant strains showed that few genes exhibited differential expression. At least one gene, pilA1 (XF2542), which encodes the structural pilin protein of type IV fimbriae, showed decreased expression in the rpoN mutant whereas an operon encoding proteins of type I fimbriae were twofold more expressed in the mutant. Quantitative real time RT-PCR (qRT-PCR) analysis confirmed that pilA1 transcript was significantly reduced in the rpoN mutant. The transcriptional start site of pilA1 was determined by primer extension, and a canonical σ54-dependent promoter was found upstream of the start site. Genome sequence analysis of X. fastidiosa revealed five paralogues of pilA, but microarray and qRT-PCR data demonstrated that only the pilA1 transcript was significantly affected in the rpoN mutant. The rpoN mutant made more biofilm than the wild type strain and presented a cell-cell aggregative phenotype. These results indicate that σ54 regulates biofilm formation, probably via differential regulation of genes involved in type IV and type I fimbrial biogenesis. Keywords: rpoN mutant strain, pili

2007-10-22 | GSE8097 | GEO

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