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salmonella infections/пролин
Врската е зачувана во таблата со исечоци
Страница 1 од 238 резултати
Proline transport in Salmonella typhimurium: putP permease mutants with altered substrate specificity.
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The putP gene encodes a proline permease required for Salmonella typhimurium LT2 to grow on proline as the sole source of nitrogen. The wild-type strain is sensitive to two toxic proline analogs (azetidine-2-carboxylic acid and 3,4-dehydroproline) also transported by the putP permease. Most
The proline-rich peptide Bac7(1-35) reduces mortality from Salmonella typhimurium in a mouse model of infection.
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BACKGROUND
Bac7 is a proline-rich peptide with a potent in vitro antimicrobial activity against Gram-negative bacteria. Here we investigated its activity in biological fluids and in vivo using a mouse model of S. typhimurium infection.
RESULTS
The efficacy of the active 1-35 fragment of Bac7 was
Studies of the toxicological potential of tripeptides (L-valyl-L-prolyl-L-proline and L-isoleucyl-L-prolyl-L-proline): IX. Evaluation of the mutagenic potential of synthesized L-valyl-L-prolyl-L-proline in the Salmonella-Escherichia coli/microsome, incorporation assay.
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The objective of this study was to assess the mutagenic potential of a synthesized tripeptide, L-valyl-L-prolyl-L-proline (VPP), to induce mutational changes in Salmonella typhimurium LT2 strains TA1535, TA1537, TA98, and TA100, and Escherichia coli strain WP2uvrA in the classical Ames test
Evolutionary genetics of the proline permease gene (putP) and the control region of the proline utilization operon in populations of Salmonella and Escherichia coli.
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Virtually complete sequences (1,467 bp) of the proline permease gene (putP) and complete sequences (416 to 422 bp) of the control region of the proline utilization operon were determined for 16 strains of Salmonella, representing all eight subspecies, and 13 strains of Escherichia coli recovered
Energetics of galactose, proline, and glutamine transport in a cytochrome-deficient mutant of Salmonella typhimurium.
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The effect of inhibitors and uncouplers on the osmotic shock-sensitive transport systems for glutamine and galactose (by the beta-methyl galactoside permease) was compared to their effect on the osmotic shock-resistant proline and galactose permease systems in cytochrome-deficient cells of
Mg2+ regulates transcription of mgtA in Salmonella Typhimurium via translation of proline codons during synthesis of the MgtL peptide.
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In Salmonella enterica serovar Typhimurium, Mg2+ limitation induces transcription of the mgtA Mg2+ transport gene, but the mechanism involved is unclear. The 5' leader of the mgtA mRNA contains a 17-codon, proline-rich ORF, mgtL, whose translation regulates the transcription of mgtA [Park S-Y et al.
Mutants of Salmonella typhimurium that are insensitive to catabolite repression of proline degradation.
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In Salmonella typhimurium the two enzymes of proline catabolism, proline oxidase and Delta(1)-pyrroline-5-carboxylic acid dehydrogenase, are subject to catabolite repression when the cells are grown in the presence of glucose. Mutants partially relieved of catabolite repression (PutR) for the
A third L-proline permease in Salmonella typhimurium which functions in media of elevated osmotic strength.
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Exogenous proline specifically stimulates the growth rate of enteric bacteria in media of inhibitory osmotic strength (J. H. B. Christian, Aust. J. Biol. Sci. 8:490-497, 1955). I observed that Salmonella typhimurium mutants which lack both of the previously known proline permeases (putP proP) are
Proline uptake through the major transport system of Salmonella typhimurium is coupled to sodium ions.
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Strains of Salmonella typhimurium deficient in one or more of the proline transport systems have been constructed and used to study the mechanism of energy coupling to transport. Proline uptake through the major proline permease (PP-I, putP) is shown to be absolutely coupled to Na+ ions and not to
Biochemistry and regulation of a second L-proline transport system in Salmonella typhimurium.
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This paper reports some biochemical characteristics of a second L-proline transport system in Salmonella typhimurium. In the accompanying paper, R. Menzel and J. Roth (J. Bacteriol. 141:1064--1070, 1980) have identified this system by showing that it is inactivated by mutations at the locus proP. We
Nucleotide sequences of three proline tRNAs from Salmonella typhimurium.
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The nucleotide sequences of three proline tRNAs from Salmonella typhimurium were determined by post-labeling procedures. The three proline tRNAs had almost identical sequences in the D-arm and T psi C-arm, and all contained 1-methylguanosine next to the 3'-end of the anticodon. The anticodon
Effect of the proline analogue baikiain on proline metabolism in Salmonella typhimurium.
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A proline analogue, 4,5-dehydro-l-pipecolic acid (baikiain) induces the formation in Salmonella typhimurium of the two enzymes catalyzing the degradation of proline, proline oxidase and Delta(1)-pyrroline-5-carboxylic acid (P5C) dehydrogenase. The level of induction by 20 mm baikiain is about 10% of
Regulation of proline degradation in Salmonella typhimurium.
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The pathway for proline degradation in Salmonella typhimurium appears to be identical to that found in Escherichia coli and Bacillus subtilis. Delta(1)-Pyrroline-5-carboxylic acid (P5C) is an intermediate in the pathway; its formation consumes molecular oxygen. Assays were devised for proline
Proline excretion and indirect suppression in Escherichia coli and Salmonella typhimurium.
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The last step in proline biosynthesis in Escherichia coli K-12, Salmonella typhimurium LT7, and a number of other enterobacterial isolates is regulated so that no proline is excreted, even if excess Delta(1)-pyrroline-5-carboxylate, the immediate precursor of proline, is added to a culture. In
Cluster of genes controlling proline degradation in Salmonella typhimurium.
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A cluster of genes essential for degradation of proline to glutamate (put) is located between the pyrC and pyrD loci at min 22 of the Salmonella chromosome. A series of 25 deletion mutants of this region have been isolated and used to construct a fine-structure map of the put genes. The map includes
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