title: Imidazolo-dC metal-mediated base pairs: purine nucleosides capture two Ag(+) ions and form a duplex with the stability of a covalent DNA cross-link.
abstract: 8-Phenylimidazolo-dC ((ph) ImidC, 2) forms metal-mediated DNA base pairs by entrapping two silver ions. To this end, the fluorescent "purine" 2'-deoxyribonucleoside 2 has been synthesised and converted into the phosphoramidite 6. Owing to the ease of nucleobase deprotonation, the new Ag(+) -mediated base pair containing a "purine" skeleton is much stronger than that derived from the pyrrolo- [3,4-d]pyrimidine system ((ph) PyrdC, 1). The silver-mediated (ph) ImidC-(ph) ImidC base pair fits well into the DNA double helix and has the stability of a covalent cross-link. The formation of such artificial metal base pairs might not be limited to DNA but may be applicable to other nucleic acids such as RNA, PNA and GNA as well as other biopolymers.
authors.affiliation: Laboratory of Bioorganic Chemistry and Chemical Biology, Center for Nanotechnology, Heisenbergstraße 11, 48149 Münster (Germany), Fax: (+49) 251-53406857; Laboratorium für Organische und Bioorganische Chemie, Institut für Chemie neuer Materialien, Universität Osnabrück, Barbarastraße 7, 49069 Osnabrück (Germany).
authors.forename: Hui
authors.initials: H
authors.lastname: Mei
authors.forename: Sachin A
authors.initials: SA
authors.lastname: Ingale
authors.forename: Frank
authors.initials: F
authors.lastname: Seela
mesh_terms: D020029:Base Pairing; D001483:Base Sequence; D002414:Cations, Monovalent / Q000737:chemistry; D004247:DNA / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D011684:Purine Nucleosides / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*
chemical_list: D002414:Cations, Monovalent; D007093:Imidazoles; D011684:Purine Nucleosides; D012834:Silver; C029899:imidazole; D004247:DNA
keywords: DNA; nucleosides; silver