DNA is inherently limited by its four natural nucleotides. Efforts to expand the genetic alphabet, by addition of an unnatural base pair, promise to expand the biotechnological applications available for DNA as well as to be an essential first step toward expansion of the genetic code. We have conducted two independent screens of hydrophobic unnatural nucleotides to identify novel candidate base pairs
DNA 在本质上受到其四种天然核苷酸的限制。通过添加非自然碱基对来扩展遗传字母表的努力有望扩展可用于 DNA 的
生物技术应用,并成为扩展遗传密码必不可少的第一步。我们对疏
水性非天然核苷酸进行了两次独立筛选,以鉴定天然
DNA 聚合酶能很好识别的新型候选碱基对。从 3600 个候选碱基对池中,两个屏幕都识别出相同的碱基对,dSICS:dMMO2,我们在此报告。使用一系列相关的类似物,我们进行了详细的构效关系分析,这使我们能够识别每个核碱基上的基本官能团。根据这些研究的结果,我们设计了一个优化的碱基对,d5SICS:dMMO2,