title: Structure of propeller-type parallel-stranded RNA G-quadruplexes, formed by human telomeric RNA sequences in K+ solution.
abstract: Very recent studies showed that mammalian telomeres were transcribed into telomeric-repeat-containing RNAs and suggested that these RNA molecules were biologically important. Here we report on a structural study of RNA G-quadruplexes formed by human telomeric RNA sequences in K(+) solution. Our data indicated that these sequences formed propeller-type parallel-stranded RNA G-quadruplexes. We have determined the NMR-based solution structure of a dimeric propeller-type RNA G-quadruplex formed by the 12-nt human telomeric RNA sequence r(UAGGGUUAGGGU). We also observed the stacking of two such propeller-type G-quadruplex blocks for the 10-nt human telomeric RNA sequence r(GGGUUAGGGU) and a higher-order G-quadruplex structure for the 9-nt human telomeric RNA sequence r(GGGUUAGGG). Based on these findings we proposed how higher-order structures might be formed by long telomeric RNA.
authors.affiliation: Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371.
authors.forename: Herry
authors.initials: H
authors.lastname: Martadinata
authors.forename: Anh Tuân
authors.initials: AT
authors.lastname: Phan
mesh_terms: D001483:Base Sequence; D002414:Cations, Monovalent / Q000737:chemistry; D002942:Circular Dichroism; D054856:G-Quadruplexes; D006801:Humans; D008958:Models, Molecular; D019906:Nuclear Magnetic Resonance, Biomolecular; D011188:Potassium / Q000737:chemistry*; D012313:RNA / Q000737:chemistry* / Q000235:genetics; D012091:Repetitive Sequences, Nucleic Acid; D012964:Sodium / Q000737:chemistry; D012996:Solutions; D016615:Telomere / Q000737:chemistry* / Q000235:genetics
chemical_list: D002414:Cations, Monovalent; D012996:Solutions; D012313:RNA; D012964:Sodium; D011188:Potassium