title: Cloning of the methionine regulatory gene, metJ, of Escherichia coli K12 and identification of its product.
abstract: Both wild-type and mutant forms of the methionine regulatory gene, metJ, of Escherichia coli K12 have been cloned in derivatives of pBR322. In cells carrying plasmids with a functional copy of metJ, the methionine regulon appears to be repressed even under conditions of methionine limitation. Maxicell labeling experiments show that the plasmids code for a small peptide (12 kilodaltons) only when they carry a functional copy of metJ. The lesions in five independently isolated metJ mutants are located in, or slightly upstream from, a coding sequence proposed to be metJ by Saint-Girons, I., Duchange, N., Cohen, G. N., and Zakin, M. M. [1984) J. Biol. Chem. 259, 14282-14285).
mesh_terms: D000483:Alleles; D003001:Cloning, Molecular; D004269:DNA, Bacterial / Q000032:analysis; D004926:Escherichia coli / Q000235:genetics*; D005809:Genes, Regulator; D008715:Methionine / Q000235:genetics*; D009154:Mutation; D010957:Plasmids
chemical_list: D004269:DNA, Bacterial; D008715:Methionine