title: Cross-ligation and exchange reactions catalyzed by hairpin ribozymes.
abstract: The negative strand of the satellite RNA of tobacco ringspot virus (sTobRV(-)) contains a hairpin catalytic domain that shows self-cleavage and self-ligation activities in the presence of magnesium ions. We describe here that the minimal catalytic domain can catalyze a cross-ligation reaction between two kinds of substrates in trans. The cross-ligated product increased when the reaction temperature was decreased during the reaction from 37 degrees C to 4 degrees C. A two-stranded hairpin ribozyme, divided into two fragments between G45 and U46 in a hairpin loop, showed higher ligation activity than the nondivided ribozyme. The two stranded ribozyme also catalyzed an exchange reaction of the 3'-portion of the cleavage site.
authors.affiliation: Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Komatsu
authors.forename: M
authors.initials: M
authors.lastname: Koizumi
authors.forename: A
authors.initials: A
authors.lastname: Sekiguchi
authors.forename: E
authors.initials: E
authors.lastname: Ohtsuka
mesh_terms: D001483:Base Sequence; D004591:Electrophoresis, Polyacrylamide Gel; D007700:Kinetics; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D010942:Plant Viruses / Q000201:enzymology* / Q000235:genetics; D016337:RNA, Catalytic / Q000737:chemistry / Q000378:metabolism*; D012367:RNA, Viral / Q000737:chemistry / Q000378:metabolism*; D013696:Temperature
chemical_list: D016337:RNA, Catalytic; D012367:RNA, Viral