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  • Title: Regulation of the Salmonella typhimurium metA gene by the metR protein and homocysteine.
    Author: Mares R, Urbanowski ML, Stauffer GV.
    Journal: J Bacteriol; 1992 Jan; 174(2):390-7. PubMed ID: 1729233.
    Abstract:
    The DNA sequence of the Salmonella typhimurium metA control region is presented. S1 nuclease mapping was used to determine the transcription initiation site. By measuring beta-galactosidase levels in Escherichia coli strains lysogenized with lambda phage carrying a metA-lacZ gene fusion, the MetR protein was shown to activate the metA gene. Homocysteine, an intermediate in methionine biosynthesis, plays a negative role in the MetR-mediated activation mechanism. Gel mobility shift assays and DNase I protection experiments showed that the MetR protein binds to a DNA fragment carrying the metA control region and protects a 26-bp region beginning 9 bp upstream of the -35 promoter sequence.
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