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We investigated the regulation of the livJ and livKHMGF operons, which are involved in branched-chain amino acid high-affinity transport in Salmonella typhimurium. When livJ was fused to lacZ at the second codon of livJ to make a livJ-lacZ protein fusion, expression from the livJ promoter was not repressed even under repressing growth conditions; however, expression of an analogous construct of livK-lacZ...
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