作者:Mark K. Schlegel、Lars-Oliver Essen、Eric Meggers
DOI:10.1021/ja802788g
日期:2008.7.1
The crystal structure of an 8-mer (S)-GNA duplex is presented. As a tool for phasing, the anomalous diffraction of two copper(II) ions within two artificial metallo-base pairs was employed. The duplex structure confirms a canonical Watson−Crick base pairing scheme of GNA with antiparallel strands. The duplex secondary structure is distinct from canonical A- and B-form nucleic acids and can be described
呈现了 8 聚体 (S)-GNA 双链体的晶体结构。作为定相的工具,使用了两个人工金属碱基对中的两个铜 (II) 离子的异常衍射。双链体结构证实了 GNA 与反平行链的规范 Watson-Crick 碱基配对方案。双链二级结构不同于经典的 A 型和 B 型核酸,可以描述为缠绕在螺旋轴周围的右手螺旋带,形成一个大的空心核。最有趣的是,相邻的碱基对彼此强烈滑动,导致广泛的链间碱基疏水相互作用以及核碱基与其主链之间不寻常的疏水链内相互作用。
Metal-mediated base pairing within the simplified nucleic acid GNA
作者:Mark K. Schlegel、Lilu Zhang、Nicholas Pagano、Eric Meggers
DOI:10.1039/b816142a
日期:——
Hydroxypyridone and pyridopurine homo- and hetero-base pairs have been investigated in the context of duplexGNA (glycol nucleicacid). Phosphoramidites for automated GNA solid phase synthesis were synthesized economically in a few steps starting from commercially available enantiopure glycidol. Similar to their behavior in DNA, the hydroxypyridone and pyridopurine homo-base pairs display a metal-dependent