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Seite 1 von 318 Ergebnisse
A tyrosine phosphoregulatory system controls exopolysaccharide biosynthesis and biofilm formation in Vibrio cholerae
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Production of an extracellular matrix is essential for biofilm formation, as this matrix both secures and protects the cells it encases. Mechanisms underlying production and assembly of matrices are poorly understood. Vibrio cholerae, relies heavily on biofilm formation for survival, infectivity,
Comparative tyrosine degradation in Vibrio cholerae strains. The strain ATCC 14035 as a prokaryotic melanogenic model of homogentisate-releasing cell.
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The relationship between L-tyrosine catabolism and melanin formation was studied in the Vibrio cholerae strains ATCC 14035 and CECT 557. It is shown that both strains degrade L-tyrosine by the same pathway as eukaryotic cells, giving homogentisate as intermediate. ATCC 14035, an O1 strain, which is
Atomic resolution crystal structure of VcLMWPTP-1 from Vibrio cholerae O395: insights into a novel mode of dimerization in the low molecular weight protein tyrosine phosphatase family.
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Low molecular weight protein tyrosine phosphatase (LMWPTP) is a group of phosphotyrosine phosphatase ubiquitously found in a wide range of organisms ranging from bacteria to mammals. Dimerization in the LMWPTP family has been reported earlier which follows a common mechanism involving active site
Cloning, purification, crystallization and preliminary X-ray analysis of two low-molecular-weight protein tyrosine phosphatases from Vibrio cholerae.
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Low-molecular-weight protein tyrosine phosphatases (LMWPTPs) are small cytoplasmic enzymes of molecular weight ∼18 kDa that belong to the large family of protein tyrosine phosphatases (PTPs). Despite their wide distribution in both prokaryotes and eukaryotes, their exact biological role in bacterial
Cholera toxin diminishes tyrosine kinase activity of the insulin receptor.
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We have examined the effect of cholera toxin (CT) on the insulin receptor tyrosine kinase. Incubation of intact rat hepatoma cells FaO with CT (1 microgram/ml/2h) inhibited insulin-induced receptor autophosphorylation by 30% in vivo. This effect persisted after receptor purification in vitro. CT did
XerD-mediated FtsK-independent integration of TLCϕ into the Vibrio cholerae genome.
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As in most bacteria, topological problems arising from the circularity of the two Vibrio cholerae chromosomes, chrI and chrII, are resolved by the addition of a crossover at a specific site of each chromosome, dif, by two tyrosine recombinases, XerC and XerD. The reaction is under the control of a
Decrease in coupling of Gs in v-src-transformed NIH-3T3 fibroblasts: possible involvement of tyrosine phosphorylation of Gs by pp60v-src.
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In Rous sarcoma virus (RSV)-transformed NIH-3T3 fibroblasts expressing pp60v-src as tyrosine protein kinase, isoproterenol-stimulated cAMP accumulation was much lower than in normal cells. The reduction in v-src-transformed cells seemed to be mainly due to a decrease in the number of beta
A role for tyrosine phosphorylation in the regulation and sensitization of adenylate cyclase by melatonin.
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Mimicking short photoperiod melatonin signals (16 h exposure) on primary cell cultures of melatonin target cells of the ovine pars tuberalis (PT) results in an enhanced cAMP response to forskolin stimulation relative to untreated cells, a phenomenon termed sensitization. The sensitized response of
Regulation of guanosine triphosphate cyclohydrolase and tetrahydrobiopterin levels and the role of the cofactor in tyrosine hydroxylation in primary cultures of adrenomedullary chromaffin cells.
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Selective modification of the tetrahydrobiopterin levels in cultured chromaffin cells were followed by changes in the rate of tyrosine hydroxylation. Addition of sepiapterin, an intermediate on the salvage pathway for tetrahydrobiopterin synthesis, rapidly increased intracellular levels of
Nerve growth factor and other agents mediate phosphorylation and activation of tyrosine hydroxylase. A convergence of multiple kinase activities.
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A rapid phosphorylation of tyrosine hydroxylase occurs in the PC12 nerve-like clonal cell line in response to nerve growth factor (NGF), epidermal growth factor (EGF), dibutyryl-cAMP, cholera toxin, phorbol- 12-myristate-13-acetate (PMA), or potassium depolarization in the presence of calcium ions.
A biochemical method for tracking cholera toxin transport from plasma membrane to Golgi and endoplasmic reticulum.
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Asiatic cholera is a rapidly progressing disease resulting in extreme diarrhea and even death. The causative agent, cholera toxin, is an AB5-subunit enterotoxin produced by the bacterium Vibrio cholera. The toxin must enter the intestinal cell to cause disease. Entry is achieved by the B-subunit
The Vibrio cholerae VctPDGC system transports catechol siderophores and a siderophore-free iron ligand.
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Vibrio cholerae, the causative agent of cholera, has an absolute requirement for iron. It transports the catechol siderophores vibriobactin, which it synthesizes and secretes, and enterobactin. These siderophores are transported across the inner membrane by one of two periplasmic binding
Recombinant fusion protein of cholera toxin B subunit with YVAD secreted by Lactobacillus casei inhibits lipopolysaccharide-induced caspase-1 activation and subsequent IL-1 beta secretion in Caco-2 cells.
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BACKGROUND
Lactobacillus species are used as bacterial vectors to deliver functional peptides to the intestine because they are delivered live to the intestine, colonize the mucosal surface, and continue to produce the desired protein. Previously, we generated a recombinant Lactobacillus casei
Mechanistic insights into filamentous phage integration in Vibrio cholerae.
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Vibrio cholerae, the etiological agent of acute diarrhoeal disease cholera, harbors large numbers of lysogenic filamentous phages, contribute significantly to the host pathogenesis and provide fitness factors to the pathogen that help the bacterium to survive in natural environment. Most of the
The arrangement of subunits in cholera toxin.
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Cholera toxin consists of five similar B subunits of apparent molecular weight about 10 600 and one A subunit (29 000) consisting of two peptides (A1 23 000-24 000 and A2 about 5500) linked by a single disulfide bond. Each B subunit also contains one internal disulfide bond which is readily reduced
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