Structure/affinity studies in the bicyclo-DNA series: Synthesis and properties of oligonucleotides containing bc<sup>en</sup>-T and iso-tricyclo-T nucleosides
作者:Branislav Dugovic、Michael Wagner、Christian J Leumann
DOI:10.3762/bjoc.10.194
日期:——
incorporated into oligodeoxynucleotides and their thermal melting behavior with DNA and RNA as complements was assessed. We found that the iso-tc-T modification was significantly more destabilizing in duplex formation compared to the bc(en)-T modification. In addition, duplexes with complementary RNA were less stable as compared to duplexes with DNA as complement. A structure/affinity analysis, including the
我们介绍了属于双环-/三环-DNA 分子平台的两种新型核苷 iso-tc-T 和 bc(en)-T 的合成。在这两种修改中,碳环内围绕 C6'-C7' 的扭转通过 C6'-C7' 双键或环丙烷环的存在而平面化。通过 X 射线分析对这两种核苷的结构分析揭示了扭转角伽马的明显偏好,用于具有近乎完美的 2'-内构象的呋喃糖环的 gauche 取向。两种修饰都被纳入寡脱氧核苷酸中,并评估了它们与 DNA 和 RNA 作为互补物的热熔解行为。我们发现,与 bc(en)-T 修改相比,iso-tc-T 修改在双链体形成中更加不稳定。此外,与以 DNA 作为补体的双链体相比,具有互补 RNA 的双链体稳定性较差。结构/亲和力分析,包括已知的 bc-T 和 tc-T 修饰,不会导致扭转角 gamma 的方向与 DNA 或 RNA 亲和力的明确相关性。然而,呋喃糖构象(N 型或 S 型)与亲和力之间存在某种相关性,因为偏好