Magnesium transport in Salmonella typhimurium: Biphasic magnesium and time dependence of the transcription of the mgtA and mgtCB loci

Article Abstract:

Magnesium is an important divalent cation in living organisms, acting as a cofactor and regulator of many proteins. Three Mgsuper2+ transport systems have been identified in Salmonella typhimurium, CorA, MgtA and MgtB. MgtA and mgtCB loci encode P-type ATPases. It is reported that the depression of promoters for mgtA and mgtCB loci has biphasic time and Mgsuper2+ concentration dependence, so that depression leads to major increase in gene transcription and and functional transport protein translation, also involving a second regulatory pathway, as well as the phoPQ system.

Carrier proteins, Transport proteins, Magnesium metabolism

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Expression of the cold-shock gene cspB in Salmonella typhimurium occurs below a threshold temperature

Article Abstract:

Many bacterial species exhibit a multigenic response after temperature downshift, or cold shock. This has been reported in Salmonella typhimurium, based on low-induction-temperature gene fusions containing Mudlux insertions. One of the genes involved, known as cspB, was found to encode a homologue of the E. coli polypeptide CspA, and it is suggested that a specific temperature threshold operates for cspB expression.

Microbiology, Heat shock proteins

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Transcription of arcA and rpoS during growth of Salmonella typhimurium under aerobic and microaerobic conditions

Article Abstract:

Research reveals that the control by carbon starvation and aerobiosis/anaerobiosis of the Salmonella typhimurium and its isogenic in-frame deletion mutants arcA and rpoS during transition from exponential to stationary phase go in a complementary manner in response to stress conditions.

Czech Republic, Genetic aspects, Stress (Physiology), Genetic regulation, Genetic transcription, Transcription (Genetics), Cell culture, Tissue culture

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