title: DNA with stable fluorinated dA and dG substitutes: syntheses, base pairing and 19F-NMR spectra of 7-fluoro-7-deaza-2'-deoxyadenosine and 7-fluoro-7-deaza-2'-deoxyguanosine.
abstract: Fluorinated DNA containing stable fluorine substituents in the "purine" base were synthesized for the first time. For this, the phosphoramidites of 7-fluoro-7-deaza-2'-deoxyadenosine and 7-fluoro-7-deaza-2'-deoxyguanosine were prepared and oligonucleotides were synthesized. The 7-fluoro substitution leads to increased duplex stability and more selective base pairing compared to the non-functionalized 7-deazapurine oligonucleotides. (19)F NMR spectra of fluorinated nucleosides, single stranded oligonucleotides and DNA duplex show only a single signal for one fluorine modification. The NMR sensitive (19)F spin or the positron emitting (18)F isotope make these compounds applicable for DNA detection or imaging in vitro and in vivo.
authors.affiliation: Laboratory of Bioorganic Chemistry and Chemical Biology, Center for Nanotechnology, Heisenbergstrasse 11, 48149 Münster, Germany. Seela@uni-muenster.de
authors.forename: Frank
authors.initials: F
authors.lastname: Seela
authors.forename: Kuiying
authors.initials: K
authors.lastname: Xu
mesh_terms: D020029:Base Pairing; D001483:Base Sequence; D018360:Crystallography, X-Ray; D004247:DNA / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D003839:Deoxyadenosines / Q000138:chemical synthesis* / Q000737:chemistry; D003849:Deoxyguanosine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry; D054879:Halogenation; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D009691:Nucleic Acid Denaturation; D009838:Oligodeoxyribonucleotides / Q000138:chemical synthesis / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D044366:Transition Temperature
chemical_list: C534474:7-fluoro-7-deaza-2'-deoxyadenosine; C534475:7-fluoro-7-deaza-2'-deoxyguanosine; D003839:Deoxyadenosines; D009838:Oligodeoxyribonucleotides; D004247:DNA; D003849:Deoxyguanosine