title: Artificial self-cleaving molecules consisting of a tRNA precursor and the catalytic RNA of RNase P.
abstract: We synthesized two types of chimeric RNAs between the catalytic RNA subunit of RNase P from Escherichia coli (M1 RNA) and a tRNA precursor (pre-tRNA); one had pre-tRNA at the 3' side to the M1 RNA (M1 RNA-pre-tRNA). The second had pre-tRNA at the 5' side of the M1 RNA (pre-tRNA-M1 RNA). Both molecules were self-cleaving RNAs. The self-cleavage of M1 RNA-pre-tRNA occurred at the normal site (5'-end of mature tRNA sequence) and proceeded under the condition of 10 mM Mg2+ concentration. This reaction at 10 mM Mg2+ was an intramolecular reaction (cis-cleavage), while, at 40 mM and 80 mM Mg2+, trans-cleavage partially occurred. The self-cleavage rate was strictly affected by the distance between the M1 RNA and the pre-tRNA in the molecule. The self-cleavage of pre-tRNA-M1 RNA occurred mainly at three sites within the mature tRNA sequence. This cleavage did not occur at 10 mM Mg2+. Use of M1 RNA-pre-tRNA molecule for the in vitro evolution of M1 RNA is discussed.
authors.affiliation: Mitsubishi Kasei Institute of Life Sciences, Tokyo, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Kikuchi
authors.forename: N
authors.initials: N
authors.lastname: Sasaki-Tozawa
authors.forename: K
authors.initials: K
authors.lastname: Suzuki
mesh_terms: D000818:Animals; D001483:Base Sequence; D004330:Drosophila; D004722:Endoribonucleases / Q000378:metabolism*; D004926:Escherichia coli; D029968:Escherichia coli Proteins; D008274:Magnesium / Q000378:metabolism; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D012322:RNA Precursors / Q000378:metabolism*; D016337:RNA, Catalytic / Q000378:metabolism*; D012343:RNA, Transfer / Q000378:metabolism*; D043262:Ribonuclease P
chemical_list: D029968:Escherichia coli Proteins; D012322:RNA Precursors; D016337:RNA, Catalytic; D012343:RNA, Transfer; D004722:Endoribonucleases; D043262:Ribonuclease P; C470865:ribonuclease P, E coli; D008274:Magnesium