title: RcsCDB His-Asp phosphorelay system negatively regulates the flhDC operon in Escherichia coli.
abstract: The genes involved in flagellum synthesis, motility and chemotaxis in Escherichia coli are expressed in a hierarchical fashion. At the top of the hierarchy lies the master regulator FlhDC, required for the expression of the whole set of genes. The operon flhDC is controlled by numerous regulators including H-NS, CRP, EnvZ/OmpR, QseBC and LrhA. In the present work, we report that the flhDC operon is also negatively regulated by the His-Asp phosphorelay system RcsCDB. The regulation is potentiated by the RcsB cofactor RcsA. Genetic analysis indicates that an RcsAB box, located downstream of the promoter, is required for the regulation. The binding of RcsB and RcsA to this site was demonstrated by gel retardation and DNase I protection assays. In addition, mutation analysis suggests that RcsA-specific determinants lie in the right part of the 'RcsAB box'.
authors.affiliation: Laboratoire de Microbiologie et de Génétique Moléculaire, Centre National de la Recherche Scientifique, Toulouse, France.
authors.forename: Anne
authors.initials: A
authors.lastname: Francez-Charlot
authors.forename: Bruno
authors.initials: B
authors.lastname: Laugel
authors.forename: Alice
authors.initials: A
authors.lastname: Van Gemert
authors.forename: Nelly
authors.initials: N
authors.lastname: Dubarry
authors.forename: Florent
authors.initials: F
authors.lastname: Wiorowski
authors.forename: Marie-Pierre
authors.initials: MP
authors.lastname: Castanié-Cornet
authors.forename: Claude
authors.initials: C
authors.lastname: Gutierrez
authors.forename: Kaymeuang
authors.initials: K
authors.lastname: Cam
mesh_terms: D001426:Bacterial Proteins / Q000502:physiology*; D001483:Base Sequence; D018983:DNA Footprinting; D004252:DNA Mutational Analysis; D004269:DNA, Bacterial / Q000235:genetics; D004268:DNA-Binding Proteins / Q000096:biosynthesis / Q000235:genetics*; D024202:Electrophoretic Mobility Shift Assay; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D005407:Flagella / Q000378:metabolism; D015964:Gene Expression Regulation, Bacterial / Q000502:physiology*; D008969:Molecular Sequence Data; D009097:Multienzyme Complexes / Q000502:physiology*; D009876:Operon / Q000235:genetics; D010749:Phosphoprotein Phosphatases / Q000502:physiology*; D010770:Phosphotransferases / Q000502:physiology*; D011401:Promoter Regions, Genetic; D011494:Protein Kinases / Q000502:physiology*; D012045:Regulatory Sequences, Nucleic Acid; D015534:Trans-Activators / Q000096:biosynthesis / Q000235:genetics*; D014157:Transcription Factors; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D029968:Escherichia coli Proteins; D009097:Multienzyme Complexes; C489568:RcsB protein, E coli; D015534:Trans-Activators; D014157:Transcription Factors; C090552:flhC protein, E coli; C090553:flhD protein, E coli; C489728:rcsC protein, E coli; C074889:RcsB protein, Bacteria; C067572:RcsA protein, E coli; D010770:Phosphotransferases; D011494:Protein Kinases; C434271:rcsD protein, E coli; D010749:Phosphoprotein Phosphatases