title: EnvZ functions through OmpR to control porin gene expression in Escherichia coli K-12.
abstract: The regulatory proteins OmpR and EnvZ are both required to activate expression of the genes for the major outer membrane porin proteins, OmpF and OmpC, of Escherichia coli K-12. Here we show that OmpR, under certain conditions, could activate porin expression in the complete absence of EnvZ. In addition, the pleiotropic phenotypes conferred by a particular envZ mutation (envZ473) required the presence of functional OmpR protein. These results lead us to conclude that EnvZ and OmpR act in sequential fashion to activate porin gene expression; i.e., EnvZ modifies or in some way directs OmpR, which in turn acts at the appropriate porin gene promoter.
authors.affiliation: Department of Molecular Biology, Princeton University, New Jersey 08544.
authors.forename: J M
authors.initials: JM
authors.lastname: Slauch
authors.forename: S
authors.initials: S
authors.lastname: Garrett
authors.forename: D E
authors.initials: DE
authors.lastname: Jackson
authors.forename: T J
authors.initials: TJ
authors.lastname: Silhavy
mesh_terms: D001425:Bacterial Outer Membrane Proteins / Q000235:genetics*; D001426:Bacterial Proteins / Q000235:genetics*; D004926:Escherichia coli / Q000235:genetics*; D005786:Gene Expression Regulation; D005798:Genes, Bacterial; D009154:Mutation; D018272:Porins; D014157:Transcription Factors / Q000235:genetics*
chemical_list: D001425:Bacterial Outer Membrane Proteins; D001426:Bacterial Proteins; D018272:Porins; D014157:Transcription Factors