作者:Niels Bomholt、Vyacheslav V. Filichev、Erik B. Pedersen
DOI:10.1039/c1ob05085k
日期:——
Non-nucleosidic DNA monomers comprising partially protonated amines at low pH have been designed and synthesized. The modifications were incorporated into DNA oligonucleotidesvia standard DNA phosphoramidite synthesis. The ability of cationic modifications to stabilize palindromic DNA hairpins and parallel triplexes were evaluated using gel electrophoresis, circular dichroism and thermal denaturation measurements. The non-nucleosidic modifications were found to increase the thermal stability of palindromic hairpins at pH 8.0 as compared with a nucleosidic tetraloop (TCTC). Incorporation of modifications at the 5′-end of a triplex forming oligonucleotide resulted in a significant increase in thermal stability at low pH when the modifications were placed as the 5′-dangling end.
已经设计并合成了在低pH条件下部分质子化的胺基的非核苷DNA单体。这些修饰通过标准的DNA磷酰氨基酸合成法被整合到DNA寡核苷酸中。通过凝胶电泳、圆二色谱和热变性测量,评估了阳离子修饰稳定发夹结构和并行三重螺旋的能力。与核苷酸四环(TCTC)相比,非核苷修饰被发现能够在pH 8.0条件下提高发夹结构的热稳定性。在形成三重螺旋的寡核苷酸的5′端引入修饰时,当修饰位于5′悬垂末端时,能够显著提高低pH条件下的热稳定性。