title: Metal ion-induced site-selective RNA hydrolysis by use of acridine-bearing oligonucleotide as cofactor.
abstract: New types of noncovalent ribozyme-mimics for site-selective RNA scission are prepared by combining metal ions with oligonucleotides bearing an acridine. Lanthanide(III) ions and various divalent metal ions (Zn(II), Mn(II), Cu(II), Ni(II), Co(II), Mg(II), and Ca(II)) are employed without being bound to any sequence-recognizing moiety. The modified oligonucleotide forms a heteroduplex with the substrate RNA, and selectively activates the phosphodiester linkages in front of the acridine. As a result, these linkages are preferentially hydrolyzed over the others, even though the metal ions are not fixed anywhere. The scission is efficient under physiological conditions, irrespective of the sequence at the target site. Site-selective RNA scission is also successful with the combination of an oligonucleotide bearing an acridine at its terminus, another unmodified oligonucleotide, and the metal ion. In a proposed mechanism, the acridine pushes the unpaired ribonucleotide out of the heteroduplex and changes the conformation of RNA at the target site for the sequence-selective activation.
authors.affiliation: Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro, Tokyo 153-8904, Japan.
authors.forename: Akinori
authors.initials: A
authors.lastname: Kuzuya
authors.forename: Ryo
authors.initials: R
authors.lastname: Mizoguchi
authors.forename: Fumi
authors.initials: F
authors.lastname: Morisawa
authors.forename: Kenzo
authors.initials: K
authors.lastname: Machida
authors.forename: Makoto
authors.initials: M
authors.lastname: Komiyama
mesh_terms: D000166:Acridines / Q000737:chemistry*; D001483:Base Sequence; D001665:Binding Sites; D002413:Cations, Divalent / Q000737:chemistry; D006868:Hydrolysis; D007700:Kinetics; D028581:Lanthanoid Series Elements / Q000737:chemistry; D008345:Manganese / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D018716:Molecular Mimicry; D009841:Oligonucleotides / Q000138:chemical synthesis / Q000737:chemistry*; D012313:RNA / Q000737:chemistry* / Q000378:metabolism; D016337:RNA, Catalytic / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013379:Substrate Specificity; D015032:Zinc / Q000737:chemistry
chemical_list: D000166:Acridines; D002413:Cations, Divalent; D028581:Lanthanoid Series Elements; D008670:Metals; D009841:Oligonucleotides; D016337:RNA, Catalytic; D008345:Manganese; D012313:RNA; D015032:Zinc