title: Selective structural change by spermidine in the bulged-out region of double-stranded RNA and its effect on RNA function.
abstract: Polyamines play important roles in cell growth mainly through their interaction with RNA. We have previously reported that polyamines stimulate the synthesis of oligopeptide-binding protein OppA in Escherichia coli and the formation of Ile-tRNA in rat liver (Igarashi, K., and Kashiwagi, K. (2000) Biochem. Biophys. Res. Commun. 271, 559-564). These effects involve an interaction of polyamines with the bulged-out region of double-stranded RNA in the initiation region of OppA mRNA and in the acceptor stem of rat liver tRNA(Ile). In this study, the effects of polyamines on E. coli OppA synthesis and rat liver Ile-tRNA formation were compared using OppA mRNA and tRNA(Ile) with or without the bulged-out region of double-stranded RNA. The results indicate that the bulged-out region is involved in polyamine stimulation of OppA synthesis and Ile-tRNA formation. A selective structural change by spermidine in the bulged-out region of double-stranded RNA was confirmed by circular dichroism.
authors.affiliation: Graduate School of Pharmaceutical Sciences, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8675, Japan.
authors.forename: Kyohei
authors.initials: K
authors.lastname: Higashi
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Terui
authors.forename: Akiko
authors.initials: A
authors.lastname: Suganami
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Tamura
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Nishimura
authors.forename: Keiko
authors.initials: K
authors.lastname: Kashiwagi
authors.forename: Kazuei
authors.initials: K
authors.lastname: Igarashi
mesh_terms: D000818:Animals; D001483:Base Sequence; D002352:Carrier Proteins / Q000378:metabolism*; D002942:Circular Dichroism; D004926:Escherichia coli / Q000378:metabolism; D029968:Escherichia coli Proteins / Q000378:metabolism*; D008074:Lipoproteins / Q000378:metabolism*; D008099:Liver / Q000378:metabolism; D008954:Models, Biological; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D011073:Polyamines / Q000737:chemistry; D017510:Protein Folding; D012313:RNA / Q000737:chemistry*; D012330:RNA, Double-Stranded / Q000235:genetics*; D051381:Rats; D012984:Software; D013095:Spermidine / Q000737:chemistry*
chemical_list: D002352:Carrier Proteins; D029968:Escherichia coli Proteins; D008074:Lipoproteins; C499290:OppA protein, E coli; D011073:Polyamines; D012330:RNA, Double-Stranded; D012313:RNA; D013095:Spermidine