Incorporation of Pseudo‐complementary Bases 2,6‐Diaminopurine and 2‐Thiouracil into Serinol Nucleic Acid (SNA) to Promote SNA/RNA Hybridization
作者:Yukiko Kamiya、Fuminori Sato、Keiji Murayama、Atsuji Kodama、Susumu Uchiyama、Hiroyuki Asanuma
DOI:10.1002/asia.201901728
日期:2020.4.17
incorporation of 2,6-diaminpurine (D), which can form three hydrogen bonds with uracil, into SNA increases the melting temperature of SNA-RNA duplexes. However, D incorporation into short self-complementary regions of SNA promoted self-dimerization and hindered hybridization with RNA. Here we synthesized a SNA monomer of 2-thiouracil (sU), which was expected to inhibit base pairing with D by steric hindrance between
丝氨醇核酸(SNA)由于其对RNA的高度亲和力,因此是基于核酸的分子探针和药物的有希望的候选者。我们以前的工作表明,可以与尿嘧啶形成三个氢键的2,6-二氨基嘌呤(D)掺入SNA会提高SNA-RNA双链体的解链温度。然而,D掺入SNA的短自我互补区域促进了自我二聚化并阻碍了与RNA的杂交。在这里,我们合成了2-硫尿嘧啶(sU)的SNA单体,该单体有望通过硫和氨基之间的空间位阻抑制与D的碱基配对。为了高产率地制备含有D和sU的SNA,我们在D和sU单体上定制了在酸性条件下易于脱保护的保护基。通过抑制SNA的自杂交并增加SNA异源双链体及其互补RNA的稳定性,将D和sU掺入SNA有助于与靶RNA稳定形成双链体。我们的结果对基于SNA的探针和核酸药物的开发具有重要意义。