title: Recognition of boxA antiterminator RNA by the E. coli antitermination factors NusB and ribosomal protein S10.
abstract: The boxA sequences of the E. coli ribosomal RNA (rrn) operons are sufficient to cause RNA polymerase to read through Rho-dependent transcriptional terminators. We show that a complex of the transcription antitermination factors NusB and ribosomal protein S10 interacts specifically with boxA RNA. Neither NusB nor S10 binds boxA RNA on its own, and neither NusA nor NusG affects the interaction of the NusB-S10 complex with boxA RNA. Mutations in boxA that impair its antitermination activity compromise its interaction with NusB and S10, suggesting that ribosomal protein S10 regulates the synthesis of ribosomal RNA in bacteria. RNA containing the closely related boxA sequence from the bacteriophage lambda nutR site is not stably bound by NusB and S10. This probably explains why antitermination in phage lambda depends on the phage lambda N protein and the boxB component of the nut site, in addition to boxA.
authors.affiliation: Banting and Best Department of Medical Research, Department of Molecular and Medical Genetics, University of Toronto, Canada.
authors.forename: J R
authors.initials: JR
authors.lastname: Nodwell
authors.forename: J
authors.initials: J
authors.lastname: Greenblatt
mesh_terms: D001426:Bacterial Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D010582:Bacteriophage lambda / Q000235:genetics; D001483:Base Sequence; D001665:Binding Sites; D003001:Cloning, Molecular / Q000379:methods; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics* / Q000378:metabolism; D029968:Escherichia coli Proteins; D005798:Genes, Bacterial; D005814:Genes, Viral; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009690:Nucleic Acid Conformation; D009876:Operon; D012313:RNA / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D012329:RNA, Bacterial / Q000235:genetics* / Q000302:isolation & purification / Q000378:metabolism; D012335:RNA, Ribosomal / Q000096:biosynthesis / Q000235:genetics* / Q000302:isolation & purification; D016601:RNA-Binding Proteins / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism*; D012269:Ribosomal Proteins / Q000378:metabolism*; D013698:Templates, Genetic; D013728:Terminator Regions, Genetic; D014157:Transcription Factors / Q000378:metabolism*; D014158:Transcription, Genetic
chemical_list: D001426:Bacterial Proteins; D029968:Escherichia coli Proteins; C074952:NusB protein, E coli; D012329:RNA, Bacterial; D012335:RNA, Ribosomal; D016601:RNA-Binding Proteins; D012269:Ribosomal Proteins; D014157:Transcription Factors; C029537:ribosomal protein S10; D012313:RNA; D012321:DNA-Directed RNA Polymerases