title: [Secondary structure of pre-rRNA 41S spacers and its possible role in determining the processing sites].
abstract: The mechanism of pre-rRNA processing is still unknown. In this paper we discuss a possible role of the secondary structure of the internal transcribed spacer region (ITS-1 and ITS-2) in processing of 41S pre-rRNA. Potential possibilities for double strand structure formation in ITS-1 and ITS-2 and its rearrangement in the course of processing of 41S pre-rRNA with involvement of U3 RNA were analyzed for a number of species. We have concluded that this rearrangement is the necessary stage in 41S pre-rRNA processing when every functionally designated area (for mature 18S, 28S and 5,8S rRNAs, for ITS-1, ITS-2 and 21S pre-rRNA) has to be organized into an individual domain. In these strongly structured domains 5'- and 3'-ends are spatially brought together whereas processing sites are localized between these compactised areas.
authors.forename: N S
authors.initials: NS
authors.lastname: Kupriianova
authors.forename: M Ia
authors.initials: MIa
authors.lastname: Timofeeva
authors.forename: A A
authors.initials: AA
authors.lastname: Baev
mesh_terms: D000818:Animals; D001483:Base Sequence; D006801:Humans; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D012322:RNA Precursors / Q000235:genetics*; D012323:RNA Processing, Post-Transcriptional; D012335:RNA, Ribosomal / Q000235:genetics*; D051381:Rats
chemical_list: D012322:RNA Precursors; D012335:RNA, Ribosomal
vernacular_title: Vtorichnaia struktura speĭserov 41S pre-rRNK i ee vozmozhnaia rol' v opredelenii mest protsessinga.