作者:B. Ravindra Babu、Raunak、Nicolai E. Poopeiko、Martin Juhl、Andrew D. Bond、Virinder S. Parmar、Jesper Wengel
DOI:10.1002/ejoc.200500023
日期:2005.6
furanose conformation. Besides, an efficient synthesis of known xylo-LNA phosphoramidite 19, required for the incorporation of 1-(2'-O,4'-C-methylene-β-D-xylofuranosyl)thymine (monomer L) is described. For comparison, hydridization data of various XNAs reported in the literature are included in the discussion section. The thermal denaturation studies show that XNAs containing conformationally locked
完全修饰的同型嘧啶 2'-脱氧-木核酸 (dXNA) 与互补的 DNA/RNA 形成三螺旋,其热稳定性与相应的 DNA:DNA 和 DNA:RNA 双链体的热稳定性相当。然而,在 DNA 链中插入单个或几个 dXNA 单体会显着降低双链体的稳定性。已知 dXNA 单体在溶液中主要采用 N 型呋喃糖构象。为了提高结合亲和力,已经合成了七种糖修饰的 XNA 单体(H、F、N、M、K、P 和 Q),并研究了它们对 DNA 和 RNA 互补物杂交的影响。预计引入 2'-氟和 2'-羟基取代基会导致对衍生自 1-(2'-deoxy-2' 的单体 F 的 C3'-内型呋喃糖构象的构象限制 -氟-β-D-呋喃木糖基)胸腺嘧啶和衍生自 1-(β-D-呋喃木糖基)胸腺嘧啶的单体 H。存在面向小沟的官能团,如 1-(2'-amino-2'-deoxy-2'-N,4'-C-methylene-β-D-xylofuranosyl)thymine