Ontology highlight
ABSTRACT:
PROVIDER: PRJNA362623 | ENA |
REPOSITORIES: ENA
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Project description:The whooping cough agent, Bordetella pertussis, subverts dendritic cell (DCs) functions through powerful immunomodulatory activities of its toxins. Here we focused on the signaling action of the adenylate cyclase toxin (CyaA) that targets myeloid cells expressing the αMβ2 integrin CD11b/CD18 (known as complement receptor 3 (CR3) or Mac-1). CyaA delivers an extremely catalytically potent adenylyl cyclase enzyme domain into the cytosol of phagocytes and disrupts their innate and adaptive immune functions through unregulated production of the key signaling molecule cAMP. Here we describe the global phosphoproteomic analysis of cAMP signaling in murine bone marrow-derived DCs exposed to CyaA. Gathered data reveal toxin-triggered alternations of phosphorylation status of proteins regulating actin cytoskeleton, chromatin remodeling, mTOR activity and IL-10 gene expression. The reported findings highlight the complexity of subversive physiological manipulation that is exerted on myeloid phagocytes by the cAMP-generating adenylate cyclase toxin of Bordetellae.
2017-11-29 | PXD004733 | Pride
Project description:Bordetella bronchiseptica is a gram-negative respiratory pathogen that causes a diverse spectrum of respiratory disease in a wide-range of hosts. We sought to determine if strains of B. bronchiseptica differed in virulence using the mouse model of infection. Mean lethal doses (LD50) of different B. bronchiseptica strains varied widely in the murine model. B. bronchiseptica strain 253 had a LD50 that was 10-fold lower than the prototypical and fully sequenced B. bronchiseptica strain RB50. Using whole genomic transcriptome analysis covering 100% of B. bronchisetpctica strain RB50ÃÂÃÂs predicted open reading frames (ORFs), 253 was identified as lacking expression of adenylate cyclase toxin (ACT).
2007-10-01 | E-MEXP-1203 | biostudies-arrayexpress
Project description:Transcriptional responses of murine macrophages to the adenylate cyclase toxin of Bordetella pertussis
| PRJNA221120 | ENA
Project description:Bordetella bronchiseptica is a gram-negative respiratory pathogen that causes a diverse spectrum of respiratory disease in a wide-range of hosts. We sought to determine if strains of B. bronchiseptica differed in virulence using the mouse model of infection. Mean lethal doses (LD50) of different B. bronchiseptica strains varied widely in the murine model. B. bronchiseptica strain 253 had a LD50 that was 10-fold lower than the prototypical and fully sequenced B. bronchiseptica strain RB50. Using whole genomic transcriptome analysis covering 100% of B. bronchisetpctica strain RB50ÃÂs predicted open reading frames (ORFs), 253 was identified as lacking expression of adenylate cyclase toxin (ACT). Using whole genomic comparative genomic hybridization analysis and whole genome sequencing, we determined that the cya operon, which is required for ACT production, was absent from the 253 genome.
2007-10-01 | E-MEXP-1205 | biostudies-arrayexpress
Project description:Numerous proteins synthesized in cells ranging from bacteria to humans have to be posttranslationally acylated to become biologically active. Bacterial Repeats in ToXin (RTX) cytolysins form a prominent group of proteins that are synthesized as inactive protoxins and undergo a posttranslational acylation on ε-amino groups of two internal conserved lysine residues by co-expressed toxin-activating acyltransferases. We investigated how the chemical nature, position and number of bound acyl chains govern the activities of Bordetella pertussis adenylate cyclase toxin (CyaA), Escherichia coli α-hemolysin (HlyA) and Kingella kingae cytotoxin (RtxA). The three protoxins were acylated in the same E. coli cell background by either of the CyaC, HlyC and RtxC acyltransferases. The results revealed that the acyltransferase itself selects from the acyl-ACP pool of the producing bacterium the type of the acyl chain of adapted length to be covalently linked to the protoxin. The acyltransferase also selects whether both or only one of two conserved lysine residues of the protoxin will be posttranslationally acylated. Functional assays then revealed that RtxA has to be modified by 14-carbon fatty acyl chains to be biologically active, while HlyA remains active also when modified by 16-carbon acyl chains and CyaA is activated exclusively by 16-carbon acyl chains. These results suggest a structural adaptation of the toxin molecules to the length of the acyl chains used for modification of their crucial acylated lysine residue in the second, more conserved acylation site
2020-05-20 | PXD018859 | Pride
Project description:Bacillus anthracis, the causative agent of anthrax, secretes three toxin proteins: protective antigen (PA), lethal factor (LF), and edema factor (EF). PA is a transporter of LF and EF into host cells by receptor-mediated endocytosis. LF is a metalloprotease that cleaves mitogen-activated protein kinase (MAPK) kinases (MKK), while EF is an adenylate cyclase, which converts ATP to cAMP. We used microarrays to decipher the specific gene regulation in edema toxin (ET), the complex of EF and PA, treated mouse bone marrow derived macrophages. Experiment Overall Design: BMDM were treated with 1 mg/ml of ET and the RNAs were purified at 0, 2, and 4h after toxin treatment.
2008-06-16 | E-GEOD-9184 | biostudies-arrayexpress
Project description:Bacillus anthracis, the causative agent of anthrax, secretes three toxin proteins: protective antigen (PA), lethal factor (LF), and edema factor (EF). PA is a transporter of LF and EF into host cells by receptor-mediated endocytosis. LF is a metalloprotease that cleaves mitogen-activated protein kinase (MAPK) kinases (MKK), while EF is an adenylate cyclase, which converts ATP to cAMP. We used microarrays to decipher the specific gene regulation in edema toxin (ET), the complex of EF and PA, treated mouse bone marrow derived macrophages. Keywords: Time course
2007-09-28 | GSE9184 | GEO
Project description:These assays represent antibody-binding assays to analyze seroprevalence of antigens and epitopes at the individual level and also to perform fine epitope mapping characterizations. In this screening 392,299 peptides derived from reactive (antigenic) regions of Trypanosoma cruzi proteins were displayed in the form of short peptides (tiling array, overlapped) and assayed with individual serum samples (antibodies) from Chagas Disease patients across the Americas. Sectorized peptide arrays (QX12-plex slides, Roche Nimblegen) were incubated with serum samples (primary antibodies), washed, and then incubated with a fluorescently-labeled anti-human IgG commercial antibody (secondary antibodies). Raw readouts of fluoresence (signal), as well as normalized signal values are provided in this submission for all samples analyzed. All samples were analyzed in duplicate (r1 = replicate 1; r2 = replicate 2).
2022-08-20 | E-MTAB-11655 | biostudies-arrayexpress