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• W1666354502 abstract "The influx of Mg2+ in Salmonella typhimurium LT-2 was studied by both kinetic and genetic techniques. Wild-type cells grown in a high MgSO4 concentration (10 mM) exhibited a Km of 15 microM for Mg2+ influx, with a Vmax of 0.25 nmol of Mg2+ per min per 10(8) cells. The apparent Km decreased to 3 microM, and the Vmax increased 60% after growth in a low MgSO4 concentration (10 microM). Co2+ was a simple competitive inhibitor (Ki = 30 microM) of Mg2+ influx in cells grown in high Mg2+ concentrations but blocked only a portion of the Mg2+ influx in cells grown in low Mg2+ concentrations. Co2+ influx exhibited kinetics similar to those of Mg2+ influx (Km = 30 microM; Vmax = 0.5 nmol of Co2+ per min per 10(8) cells) but was not affected by growth conditions. Co2+ influx was competitively inhibited by both Mg2+ and Mn2+. Mutations affecting Mg2+ uptake were isolated by selection for spontaneous resistance to toxic levels of Co2+. One class of mutants designated corA mapped at 84 min near metE with the following gene order: corA, metE, zie-3161::Tn10, pepQ. A second class designated corB mapped at 98 min near pyrB. Mg2+ influx was decreased in a corA mutant strain (relative to that of the wild type) when grown in high Mg2+ concentrations but was restored when grown in low Mg2+ concentrations. Co2+ transport was completely abolished by the corA mutation under all growth conditions. Recombinant plasmids carrying the corA region from either Escherichia coli K-12 or S. typhimurium complemented the corA mutation in S. typhimurium, restoring uptake of both Co2+ and Mg2+ and conferring sensitivity to Co2+. The S. typhimurium corA gene was localized to a restriction fragment of approximately 1.5 kilobases." @default.
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• W1666354502 date "1986-12-01" @default.
• W1666354502 modified "2023-09-25" @default.
• W1666354502 title "Magnesium transport in Salmonella typhimurium: characterization of magnesium influx and cloning of a transport gene" @default.
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• W1666354502 doi "https://doi.org/10.1128/jb.168.3.1444-1450.1986" @default.
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