title: Conserved response regulator CtrA and IHF binding sites in the alpha-proteobacteria Caulobacter crescentus and Rickettsia prowazekii chromosomal replication origins.
abstract: CzcR is the Rickettsia prowazekii homolog of the Caulobacter crescentus global response regulator CtrA. CzcR expression partially compensates for developmental defects in ctrA mutant C. crescentus cells, and CzcR binds to all five CtrA binding sites in the C. crescentus replication origin. Conversely, CtrA binds to five similar sites in the putative R. prowazekii replication origin (oriRp). Also, Escherichia coli IHF protein binds over a central CtrA binding site in oriRp. Therefore, CtrA and IHF regulatory proteins have similar binding patterns in both replication origins, and we propose that CzcR is a global cell cycle regulator in R. prowazekii.
authors.affiliation: Department of Microbiology & Immunology, Dalhousie University, Halifax, Nova Scotia B3H 4H7, Canada.
authors.forename: Ann Karen C
authors.initials: AK
authors.lastname: Brassinga
authors.forename: Rania
authors.initials: R
authors.lastname: Siam
authors.forename: William
authors.initials: W
authors.lastname: McSween
authors.forename: Herbert
authors.initials: H
authors.lastname: Winkler
authors.forename: David
authors.initials: D
authors.lastname: Wood
authors.forename: Gregory T
authors.initials: GT
authors.lastname: Marczynski
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D001665:Binding Sites; D016935:Caulobacter crescentus / Q000235:genetics* / Q000378:metabolism; D002453:Cell Cycle; D002876:Chromosomes, Bacterial / Q000235:genetics; D017124:Conserved Sequence; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial; D034982:Integration Host Factors; D008969:Molecular Sequence Data; D018741:Replication Origin / Q000235:genetics / Q000502:physiology*; D012283:Rickettsia prowazekii / Q000235:genetics* / Q000378:metabolism; D014157:Transcription Factors / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; C097706:CtrA protein, Caulobacter; D004268:DNA-Binding Proteins; D034982:Integration Host Factors; D014157:Transcription Factors