title: Slight sequence modifications unexpectedly alter the metal-dependency of a kissing-loop interaction.
abstract: Kissing-loop RNA-RNA interactions play essential roles in many biological processes. Here, by a modified SELEX (Systematic Evolution of Ligands by EXponential enrichment) procedure, we obtained a new kissing-loop RNA motif that binds the HIV-1 transactivation responsible (TAR) RNA. Surface plasmon resonance (SPR) analyses of this RNA motif, as well as similar RNA motifs previously reported, showed unexpected differences for divalent cation dependency. This result emphasizes the complex roles for metal ions even on simple RNA structures.
authors.affiliation: Department of Basic Medical Sciences, Insutitute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan.
authors.forename: Shoji P
authors.initials: SP
authors.lastname: Ohuchi
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Nakamura
mesh_terms: D052157:Aptamers, Nucleotide / Q000737:chemistry*; D002413:Cations, Divalent / Q000737:chemistry; D016325:HIV Long Terminal Repeat; D015497:HIV-1 / Q000235:genetics*; D007700:Kinetics; D008274:Magnesium / Q000737:chemistry; D009690:Nucleic Acid Conformation; D012367:RNA, Viral / Q000737:chemistry*; D052156:SELEX Aptamer Technique
chemical_list: D052157:Aptamers, Nucleotide; D002413:Cations, Divalent; D012367:RNA, Viral; D008274:Magnesium