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salmonella infections/tyrosine
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Side 1 fra 238 resultater
Involvement of c-Src tyrosine kinase upstream of class I phosphatidylinositol (PI) 3-kinases in Salmonella Enteritidis Rck protein-mediated invasion.
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The Salmonella outer membrane protein Rck mediates a Zipper entry mechanism controlled by tyrosine phosphorylation and class I phosphatidylinositol 3-kinase (PI 3-kinase). However, the underlying mechanism leading to this signaling cascade remains unclear. The present study showed that using
Salmonella/mammalian microsome assay with tetranitromethane and 3-nitro-L-tyrosine.
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The nitrosating agent tetranitromethane (TNM) and the nitrosation product 3-nitro-L-tyrosine (NT) were tested for mutagenic activity in the Salmonella/mammalian microsome assay. TNM showed strong genotoxic activity: it was mutagenic in all tester strains used (TA97, TA98, TA100, and TA102). The
Protein phosphorylation on serine, threonine, and tyrosine residues modulates membrane-protein interactions and transcriptional regulation in Salmonella typhimurium.
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There exists a plethora of tyrosine kinases that play essential roles in regulation of eukaryotic proteins. Several dual specificity kinases that phosphorylate proteins on threonine, serine, and tyrosine residues also play critical roles in eukaryotic phosphorylation cascades. In contrast, very few
Role of tyrosine kinases and the tyrosine phosphatase SptP in the interaction of Salmonella with host cells.
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Salmonella has evolved an intimate functional interface with its host. Central to this interface is a battery of bacterial proteins delivered into host cells via a specialized organelle termed the type III secretion system. A subset of these bacterial proteins stimulates cellular responses by
Regulation of tyrosine and phenylalanine biosynthesis in Salmonella.
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Several types of 4-fluorophenylalanine resistant mutants were isolated. In one type of mutant DAHP synthetase (tyr) and prephenate dehydrogenase were coordinately derepressed. The mutation was linked to aroF and tyrA and was cis- dominant by merodiploid analysis, thus confirming that it is an
Regulation of the tyrosine biosynthetic enzymes in Salmonella typhimurium: analysis of the involvement of tyrosyl-transfer ribonucleic acid and tyrosyl-transfer ribonucleic acid synthetase.
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Mutants of Salmonella typhimurium were isolated that require tyrosine for growth because of an altered tyrosyl-transfer ribonucleic acid (tRNA) synthetase. Extracts of one strain (JK10) contain a labile enzyme with decreased ability to transfer tyrosine to tRNA(Tyr) and a higher K(m) for tyrosine
Salmonella typhimurium invasion of epithelial cells: role of induced host cell tyrosine protein phosphorylation.
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Salmonella typhimurium invades nonphagocytic epithelial and fibroblast cells via a process resembling phagocytosis. We have compared some phenotypes that are involved in S. typhimurium invasion by using different host cell lines, including HeLa, Henle-407, and A431. Infection with either wild-type
Immunosuppression induced by Salmonella involves inhibition of tyrosine phosphorylation in murine T lymphocytes.
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It is well known that facultative intracellular pathogens such as Salmonella suppress the host immune system. In the present study we attempted to clarify the mechanism responsible for the suppression of T-cell proliferation in mice infected with Salmonella typhimurium. The proliferation of murine
Molecular characterization of the Salmonella typhi StpA protein that is related to both Yersinia YopE cytotoxin and YopH tyrosine phosphatase.
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Analysis of the nucleotide sequence of a 4-kb DNA fragment located between the sip and iag loci on Salmonella typhi chromosome revealed three open reading frames, termed sipF, ctpA and stpA. The 82-amino-acid (aa) sipF product showed extensive similarity to the lacP protein from S. typhimurium. The
Abelson tyrosine kinase facilitates Salmonella enterica serovar Typhimurium entry into epithelial cells.
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The intracellular gram-negative bacterial pathogen Salmonella enterica serovar Typhimurium gains entry into nonphagocytic cells by manipulating the assembly of the host actin cytoskeleton. S. enterica serovar Typhimurium entry requires a functional type III secretion system, a conduit through which
Induction of tyrosine phosphorylated proteins in THP-1 cells by Salmonella typhimurium, Pasteurella haemolytica and Haemophilus influenzae porins.
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The effect of porins purified from Salmonella typhimurium, Pasteurella haemolytica and Haemophilus influenzae on induction of tyrosine phosphorylation in THP-1 cells and C3H/HeJ macrophage was investigated. Incubation of porins at concentration of 1.0-5.0 microg ml(-1) with either THP-1 or
A secreted protein tyrosine phosphatase with modular effector domains in the bacterial pathogen Salmonella typhimurium.
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A number of bacterial pathogens have evolved sophisticated strategies to subvert host-cell signal-transduction pathways for their own benefit. These bacteria produce and export proteins capable of specific interactions with key mammalian cell regulatory molecules in order to derail the normal
A cell-free Salmonella typhimurium extract induces inhibition of tyrosine phosphorylation in murine splenic T-lymphocytes.
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In a previous study, we observed that suppression of T-cell proliferation induced by Salmonella infection is associated with inhibition of tyrosine phosphorylation in T-cells, and that a cell-free Salmonella typhimurium LT2 extract (LT2 extract) also suppressed mitogen-induced T-cell proliferation.
tyrR, a regulatory gene of tyrosine biosynthesis in Salmonella typhimurium.
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4-Fluorophenylalanine-resistant mutants of Salmonella typhimurium were isolated in which tyrosine pathway enzymes were not repressed by l-tyrosine. The mutants produced elevated levels of 3-deoxy-d-arabinoheptulosonic acid 7-phosphate (DAHP) synthetase (tyr) and chorismate mutase T-prephenate
Double sugar-tyrosine medium improves O-1 phage Salmonella screening.
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A modification of the procedure for O-1 phage Salmonella screening is presented. The novel method is based on the use of two media, i.e., a new medium (double sugar-tyrosine [DST]), which permits the combination of adonitol and sucrose fermentation and tyrosine clearing tests, and the previously
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