An adenosyl-cobalamin (coenzyme-B12)-repressed translational enhancer in the cob mRNA of Salmonella typhimurium.


Expression of the cobalamin (Cbl) biosynthetic cob operon in Salmonella typhimurium is repressed by the end-product. This regulation is conferred mainly at the translational level and involves a cobalamin-induced folding of an RNA hairpin that sequesters the ribosomal binding site (RBS) of the cob mRNA and prevents translation initiation. A combined… (More)


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