title: envM genes of Salmonella typhimurium and Escherichia coli.
abstract: Conjugation and bacteriophage P1 transduction experiments in Escherichia coli showed that resistance to the antibacterial compound diazaborine is caused by an allelic form of the envM gene. The envM gene from Salmonella typhimurium was cloned and sequenced. It codes for a 27,765-dalton protein. The plasmids carrying this DNA complemented a conditionally lethal envM mutant of E. coli. Recombinant plasmids containing gene envM from a diazaborine-resistant S. typhimurium strain conferred the drug resistance phenotype to susceptible E. coli cells. A guanine-to-adenine exchange in the envM gene changing a Gly codon to a Ser codon was shown to be responsible for the resistance character. Upstream of envM a small gene coding for a 10,445-dalton protein was identified. Incubating a temperature-sensitive E. coli envM mutant at the nonpermissive temperature caused effects on the cells similar to those caused by treatment with diazaborine, i.e., inhibition of fatty acid, phospholipid, and lipopolysaccharide biosynthesis, induction of a 28,000-dalton inner membrane protein, and change in the ratio of the porins OmpC and OmpF.
authors.affiliation: Institut für Mikrobiologie, Universität Graz, Austria.
authors.forename: F
authors.initials: F
authors.lastname: Turnowsky
authors.forename: K
authors.initials: K
authors.lastname: Fuchs
authors.forename: C
authors.initials: C
authors.lastname: Jeschek
authors.forename: G
authors.initials: G
authors.lastname: Högenauer
mesh_terms: D000483:Alleles; D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000235:genetics*; D001483:Base Sequence; D001896:Boron Compounds / Q000494:pharmacology; D003227:Conjugation, Genetic; D004352:Drug Resistance, Microbial / Q000235:genetics; D050753:Enoyl-(Acyl-Carrier-Protein) Reductase (NADH); D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism; D005798:Genes, Bacterial; D005838:Genotype; D008969:Molecular Sequence Data; D010088:Oxidoreductases; D010957:Plasmids; D015183:Restriction Mapping; D012483:Salmonella Phages / Q000235:genetics; D012486:Salmonella typhimurium / Q000187:drug effects / Q000235:genetics*; D014161:Transduction, Genetic
chemical_list: D001426:Bacterial Proteins; D001896:Boron Compounds; C032255:1,2-dihydro-1-hydroxy-6-methyl-2-(propanesulfonyl)-thieno(3,2D)(1,2,3)-diazaborine; D010088:Oxidoreductases; D050753:Enoyl-(Acyl-Carrier-Protein) Reductase (NADH)