title: Site-specific introduction of functional groups into phosphodiester oligodeoxynucleotides and their thermal stability and nuclease-resistance properties.
abstract: We report here the site-specific introduction of functional groups into phosphodiester oligodeoxynucleotides (ODNs). ODNs containing both 5-( N-aminohexyl)-carbamoyl-2'-deoxyuridine (H), which serves as a tether for the further conjugation of functional groups, and 5-(N,N-dimethylaminohexyl)carbamoyl-2'-deoxyuridine (D), which contributes to the thermal stability of the duplex and to the resistance to nucleolytic hydrolysis by nucleases, were synthesized. Functional groups such as folic acid and palmitic acid were site-specifically introduced into the terminus of the aminohexyl-linker of H. The thermal stability and resistance toward nuclease digestion of the modified ODNs were studied. We found that ODNs containing D and H formed stable duplexes with both the complementary DNA and RNA strands even when a bulky functional group such as folic acid, palmitic acid or cholesterol was attached to the terminus of the amino-linker. We also found that ODN analogues which contained D were more resistant to nucleolytic degradation by exo- and endonuclease than the unmodified ODN. Furthermore, duplexes formed by ODNs containing D and the complementary RNA could elicit RNase H activity.
authors.affiliation: Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nomura
authors.forename: Y
authors.initials: Y
authors.lastname: Ueno
authors.forename: A
authors.initials: A
authors.lastname: Matsuda
mesh_terms: D000818:Animals; D003857:Deoxyuridine / Q000737:chemistry; D004952:Esters; D005492:Folic Acid / Q000737:chemistry*; D006361:Heating; D015394:Molecular Structure; D016297:Mutagenesis, Site-Directed; D009838:Oligodeoxyribonucleotides / Q000737:chemistry* / Q000378:metabolism; D019308:Palmitic Acid / Q000737:chemistry*; D043264:Phosphodiesterase I; D010727:Phosphoric Diester Hydrolases / Q000378:metabolism; D012313:RNA / Q000378:metabolism; D016914:Ribonuclease H / Q000378:metabolism; D015719:Single-Strand Specific DNA and RNA Endonucleases / Q000378:metabolism
chemical_list: D004952:Esters; D009838:Oligodeoxyribonucleotides; D019308:Palmitic Acid; D012313:RNA; D005492:Folic Acid; D016914:Ribonuclease H; D015719:Single-Strand Specific DNA and RNA Endonucleases; D010727:Phosphoric Diester Hydrolases; D043264:Phosphodiesterase I; D003857:Deoxyuridine