title: An efficient unnatural base pair for a base-pair-expanded transcription system.
abstract: For the site-specific incorporation of artificial components into RNA by transcription, an efficient, unnatural base pair between 2-amino-6-(2-thiazolyl)purine (denoted as v) and 2-oxo(1H)pyridine (denoted as y) was developed. The substrates of y and 5-substituted y were site-specifically incorporated into RNA by T7 RNA polymerase opposite v in templates. The efficiency and fidelity of the v-y pairing in transcription were as high as those of the natural A-T(U) and G-C pairings. Furthermore, RNAs containing two adjacent y bases were also transcribed from DNA templates containing two v bases. This specific transcription allows the large-scale preparation of artificial RNAs and can be combined with other systems to simultaneously incorporate several different components into a transcript.
authors.affiliation: Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan.
authors.forename: Tsuneo
authors.initials: T
authors.lastname: Mitsui
authors.forename: Michiko
authors.initials: M
authors.lastname: Kimoto
authors.forename: Yoko
authors.initials: Y
authors.lastname: Harada
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Yokoyama
authors.forename: Ichiro
authors.initials: I
authors.lastname: Hirao
mesh_terms: D020029:Base Pairing; D001483:Base Sequence; D004247:DNA / Q000235:genetics / Q000378:metabolism*; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism; D005821:Genetic Techniques; D011687:Purines / Q000378:metabolism; D012313:RNA / Q000096:biosynthesis* / Q000235:genetics; D013698:Templates, Genetic; D013844:Thiazoles / Q000378:metabolism; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000378:metabolism
chemical_list: D011687:Purines; D013844:Thiazoles; D014764:Viral Proteins; D012313:RNA; D004247:DNA; C062210:bacteriophage T7 RNA polymerase; D012321:DNA-Directed RNA Polymerases