Hoogsteen-Duplex DNA: Synthesis and base pairing of oligonucleotides containing 1-deaza-2?-deoxyadenosine
作者:Frank Seela、Thomas Wenzel
DOI:10.1002/hlca.19940770604
日期:1994.9.21
Oligodeoxyribonucleotides containing 1-deaza-2′-deoxyadenosine ( = 7-amino-3-(2-deoxy-β-D-erythro-pentofuranosyl)-3H-imidazo[4, 5-b]pyridine; 1b) form Hoogsteen duplexes. Watson-Crick base pairs cannot be built up due to the absence of N(1). For these studies, oligonucleotide building blocks – the phosphonate 3a and the phosphoramidite 3b – were prepared from 1bvia4a and 5, as well as the Fractosil-linked
含有1脱氮-2'-脱氧腺苷寡脱氧核糖核苷酸(= 7-氨基-3-(2-脱氧β-D-赤式-pentofuranosyl)-3 ħ -咪唑并[4,5- b ]吡啶;图1b)形成的Hoogsteen双链体。由于不存在N(1),因此无法建立Watson - Crick碱基对。对于这些研究,寡核苷酸构件-膦酸酯3A和亚磷酰胺3B -从制备1B通过图4a和5,以及在Fractosil -连接的6B,并在固相合成中使用。各种适用性还研究了N保护基(参见4a – c)。所述的Hoogsteen双工d [(C 1名A)20 ]·d(T 20)(11·13 ; Ť米15°)比d(A稳定少20)·d(T 20)(12·13 ;吨米60°)。嵌段低聚物d([c 1 A)10 –; T 10 ](14)和d [T 10-(c 1 A)10 ](15)在同一链中含有嘌呤和嘧啶碱基的)也能够彼此形成双链体。发现链极性是平行的。