title: Nonenymatic ligation of double-helical DNA by alternate-strand triple helix formation.
abstract: Nonenzymatic ligation of double-stranded DNA has been performed using an alternate-strand binding oligodeoxyribonucleotide template to juxtapose the duplex termini in a triple helical complex. The template associates with the duplex termini by Hoogsteen hydrogen bonding to alternate strands on opposite sides of the ligation site. Intermolecular and intramolecular ligation of linearized plasmid DNA are observed in the reaction, which depends on the template oligodeoxyribonucleotide and a condensing agent, N-cyanoimidazole. Intramolecular ligation products include those in which both strands are covalently closed in a circle. Ligation of the two strands is sequential and occurs at comparable rates for the first and second strands ligating. The covalent linkages formed in the reaction can be cleaved by the restriction endonuclease Stu I, supporting their identification as phosphodiesters.
authors.affiliation: Arnold and Mabel Beckman Laboratory of Chemical Synthesis, California Institute of Technology, Pasadena 91125.
authors.forename: K J
authors.initials: KJ
authors.lastname: Luebke
authors.forename: P B
authors.initials: PB
authors.lastname: Dervan
mesh_terms: D001483:Base Sequence; D004247:DNA / Q000737:chemistry / Q000378:metabolism*; D015252:Deoxyribonucleases, Type II Site-Specific / Q000378:metabolism; D006860:Hydrogen Bonding; D007093:Imidazoles / Q000378:metabolism; D008969:Molecular Sequence Data; D009690:Nucleic Acid Conformation; D009838:Oligodeoxyribonucleotides / Q000378:metabolism*; D010957:Plasmids / Q000235:genetics
chemical_list: D007093:Imidazoles; D009838:Oligodeoxyribonucleotides; D004247:DNA; C028868:AGGCCT-specific type II deoxyribonucleases; D015252:Deoxyribonucleases, Type II Site-Specific; C051673:N-cyanoimidazole