title: RNA editing complex interactions with a site for full-round U deletion in Trypanosoma brucei.
abstract: Trypanosome U insertion and U deletion RNA editing of mitochondrial pre-mRNAs is catalyzed by multisubunit editing complexes as directed by partially complementary guide RNAs. The basic enzymatic activities and protein composition of these high-molecular mass complexes have been under intense study, but their specific protein interactions with functional pre-mRNA/gRNA substrates remains unknown. We show that editing complexes purified through extensive ion-exchange chromatography and immunoprecipitation make specific cross-linking interactions with A6 pre-mRNA containing a single 32P and photoreactive 4-thioU at the scissile bond of a functional site for full-round U deletion. At least four direct protein-RNA contacts are detected at this site by cross-linking. All four interactions are stimulated by unpaired residues just 5' of the pre-mRNA/gRNA anchor duplex, but strongly inhibited by pairing of the editing site region. Furthermore, competition analysis with homologous and heterologous transcripts suggests preferential contacts of the editing complex with the mRNA/gRNA duplex substrate. This apparent structural selectivity suggests that the RNA-protein interactions we observe may be involved in recognition of editing sites and/or catalysis in assembled complexes.
authors.affiliation: Department of Biochemistry and Biophysics, Texas A&M University, College Station, TX 77843, USA.
authors.forename: Anastasia
authors.initials: A
authors.lastname: Sacharidou
authors.forename: Catherine
authors.initials: C
authors.lastname: Cifuentes-Rojas
authors.forename: Kari
authors.initials: K
authors.lastname: Halbig
authors.forename: Alfredo
authors.initials: A
authors.lastname: Hernandez
authors.forename: Lawrence J
authors.initials: LJ
authors.lastname: Dangott
authors.forename: Monica
authors.initials: M
authors.lastname: De Nova-Ocampo
authors.forename: Jorge
authors.initials: J
authors.lastname: Cruz-Reyes
mesh_terms: D000818:Animals; D001483:Base Sequence; D008928:Mitochondria / Q000235:genetics; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D012313:RNA / Q000235:genetics; D017393:RNA Editing; D000077278:RNA, Mitochondrial; D016053:RNA, Protozoan / Q000737:chemistry* / Q000235:genetics; D017384:Sequence Deletion; D014346:Trypanosoma brucei brucei / Q000235:genetics*
chemical_list: D000077278:RNA, Mitochondrial; D016053:RNA, Protozoan; D012313:RNA