title: Involvement of cysB and cysE genes in the sensitivity of Salmonella typhimurium to mecillinam.
abstract: cysB and cysE strains were obtained as spontaneous mecillinam-resistant mutants of Salmonella typhimurium. The resistance to mecillinam was caused by the cys mutations which also conferred tolerance to lethal cell shape mutations. Most, but not all, cysB and cysE mutations from other origins displayed the same behavior. Resistance was abolished by O- and N-acetylserine in cysE mutants; by thiosulfate, sulfite, and sulfide in cysB mutants; and by cysteine in both types of mutants. It is concluded that an event involved in mecillinam action requires the inducer and the activator protein of the cysteine regulon.
authors.affiliation: Departamento de Radiobiología, Comisión Nacional de Energía Atómica, Buenos Aires, Argentina.
authors.forename: O J
authors.initials: OJ
authors.lastname: Oppezzo
authors.forename: D N
authors.initials: DN
authors.lastname: Antón
mesh_terms: D000123:Acetyltransferases; D000560:Amdinocillin / Q000494:pharmacology*; D001426:Bacterial Proteins / Q000235:genetics*; D003545:Cysteine / Q000235:genetics / Q000378:metabolism; D004352:Drug Resistance, Microbial; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects*; D005798:Genes, Bacterial; D009154:Mutation; D018085:Regulon; D012486:Salmonella typhimurium / Q000187:drug effects / Q000235:genetics*; D012694:Serine / Q000031:analogs & derivatives / Q000378:metabolism; D051050:Serine O-Acetyltransferase; D013440:Sulfides / Q000378:metabolism; D013447:Sulfites / Q000378:metabolism; D013885:Thiosulfates / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; C062886:CysB protein, Bacteria; C489265:CysB protein, Salmonella typhimurium; D029968:Escherichia coli Proteins; D013440:Sulfides; D013447:Sulfites; D013885:Thiosulfates; D012694:Serine; D000123:Acetyltransferases; C070785:CysE protein, E coli; D051050:Serine O-Acetyltransferase; C043943:O-acetylserine; D003545:Cysteine; D000560:Amdinocillin; C012162:N-acetylserine