Abstract Chemically modified oligonucleotides (ONs) have recently gained much attention as therapeutic materials because of their improved properties. Here, a newly designed nucleic acid analog based on α-l-threosamine (named cTNA) is reported. cTNA has a “dual” constrained structure, with a bridged sugar moiety and shorter phosphoramidate backbone, to reduce the entropy loss during the hybridization
摘要
化学修饰的寡核苷酸(ONs)由于其改进的特性,最近作为治疗材料受到了广泛关注。在这里,报道了一种新设计的基于 α-l-苏糖胺(命名为 cTNA)的
核酸类似物。cTNA 具有“双重”约束结构,具有桥接糖部分和较短的
氨基
磷酸酯骨架,以减少杂交过程中的熵损失。出乎意料的是,与天然 ON 相比,含有 cTNA 单元的 ON 与互补 RNA 和 DNA 的结合亲和力较低。量子
化学计算表明 cTNA 的相对核碱基方向可能不利于杂交。