Synthesis and Electron Paramagnetic Resonance Studies of Oligodeoxynucleotides Containing 2-N-tert-Butylaminoxyl-2'-deoxyadenosines.
Oligodeoxynucleotides (ODNs) containing 2-N-tert-butylaminoxyl-2'-deoxyadenosine (A*) residues were synthesized to allow accurate monitoring of adenine motion by EPR spectroscopy through the agency of direct linkage of the acyclic aminoxyl group to the nucleobase, and EPR studies of the ODNs in single- and double-stranded forms were performed. Upon duplex formation, peak broadening and decreases in peak height were observed in EPR spectra, and the synthesized ODNs were shown to be excellent monitors of hybridization. Comparison of peak height and the h1/h0signal ratio provided information on the relative mobility of A* in duplexes with different stability. A second set of ODNs each containing two A* residues at different intervals and four dA residues were also synthesized. For these ODNs, correlations were observed between the EPR spectral shapes of the duplexes and the number of dA residues between A* residues, thus demonstrating the potential of A* residues in monitoring of the structures of nucleic acids.
Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, Japan.
Manami
M
Kurita
Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, Japan.
Yoshitaka
Y
Higuchi
Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, Japan.
J W
JW
Mirc
Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, Japan.
Shintaro
S
Matsumoto
Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, Japan.
Kazuteru
K
Usui
Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, Japan.
Hiroshi
H
Suemune
Graduate School of Pharmaceutical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, Fukuoka, Japan.
Mariko
M
Aso
D001483:Base Sequence; D003839:Deoxyadenosines / Q000737:chemistry*; D004578:Electron Spin Resonance Spectroscopy; D009693:Nucleic Acid Hybridization; D009838:Oligodeoxyribonucleotides / Q000138:chemical synthesis / Q000737:chemistry*; D013113:Spin Labels
C528356:2-N-tert-butylaminoxyl-2'-deoxyadenosine; D003839:Deoxyadenosines; D009838:Oligodeoxyribonucleotides; D013113:Spin Labels
DNA structures; EPR spectroscopy; aminoxyl radicals; nucleic acids; spin-labeled nucleosides