Functionalized 2′-Amino-α-L-LNA: Directed Positioning of Intercalators for DNA Targeting
作者:T. Santhosh Kumar、Andreas S. Madsen、Michael E. Østergaard、Sujay P. Sau、Jesper Wengel、Patrick J. Hrdlicka
DOI:10.1021/jo802037v
日期:2009.2.6
and enzymatic stability. Herein, the synthesis, biophysical characterization, and molecular modeling of N2′-functionalized 2′-amino-α-L-LNA is described. Chemoselective N2′-functionalization of protected amino alcohol 1 followed by phosphitylation afforded a structurally varied set of target phosphoramidites, which were incorporated into oligodeoxyribonucleotides. Incorporation of pyrene-functionalized
化学修饰的寡核苷酸越来越多地应用于基于核酸的治疗和诊断。LNA(锁核酸)及其非对映异构体 α-L-LNA 是其中两个有希望的例子,它们表现出更高的热稳定性和酶稳定性。在此,描述了 N2'-功能化 2'-氨基-α-L-LNA 的合成、生物物理表征和分子建模。受保护的氨基醇1 的化学选择性 N2'-功能化,然后进行磷酸化,提供了一组结构不同的目标亚磷酰胺,这些亚磷酰胺被整合到寡脱氧核糖核苷酸中。掺入芘功能化的结构单元,例如 2' - N -(pyren-1-yl)carbonyl-2'-amino-α-L-LNA(单体X) 导致热亲和力显着增加,尤其是针对 DNA 靶标的每次修饰高达 +19.5 °C。相比之下,掺入具有小的非芳香族 N2'-功能性的结构单元,例如2'- N-乙酰基-2'-氨基-α-L-LNA(单体V)对 DNA/RNA 互补物的热亲和力有不利影响,并会降低每次修改高达 -16