title: Cloning and mapping of the genetic determinants for microcin B17 production and immunity.
abstract: Plasmid pMccB17 (70 kilobases [kb]) codes for the production of microcin B17, a peptide that inhibits DNA synthesis, and for microcin B17 immunity. A BamHI-EcoRI fragment of 5.1 kb from pMccB17 was cloned into pBR322 in two steps. The resulting plasmid (pMM102) overproduced microcin B17 and expressed immunity against microcin. Mcc- and Mcc- Imm- mutants were isolated on plasmids pMccB17 and pMM102 by deleting various DNA fragments and by inserting different translocatable elements. Physical and phenotypic characterization of these mutants showed that a DNA region of 3.0 to 3.5 kb is required to produce microcin B17, whereas an adjacent region of about 1.0 kb is required to express microcin B17 immunity.
authors.forename: J L
authors.initials: JL
authors.lastname: San Millan
authors.forename: C
authors.initials: C
authors.lastname: Hernandez-Chico
authors.forename: P
authors.initials: P
authors.lastname: Pereda
authors.forename: F
authors.initials: F
authors.lastname: Moreno
mesh_terms: D001430:Bacteriocins / Q000235:genetics*; D002872:Chromosome Deletion; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D004251:DNA Transposable Elements; D004926:Escherichia coli / Q000235:genetics*; D005786:Gene Expression Regulation; D005796:Genes; D005798:Genes, Bacterial; D010957:Plasmids
chemical_list: D001430:Bacteriocins; D004251:DNA Transposable Elements; C020411:microcin