Indolo[3,2-<i>c</i>]quinoline G-Quadruplex Stabilizers: a Structural Analysis of Binding to the Human Telomeric G-Quadruplex
作者:João Lavrado、Stephan A. Ohnmacht、Isabel Correia、Clara Leitão、Sílvia Pisco、Mekala Gunaratnam、Rui Moreira、Stephen Neidle、Daniel J. V. A. dos Santos、Alexandra Paulo
DOI:10.1002/cmdc.201500067
日期:2015.5
G‐quadruplex (G4) binding mode and efficiency. Fluorescence resonance energy transfer melting assays showed that IQcs with a positive charge in the heteroaromatic nucleus and two weakly basic side chains are potent and selective human telomeric (HT) and gene promoter G4 stabilizers. Spectroscopic studies with HT G4 as a model showed that an IQc stabilizing complex involves the binding of two IQc molecules
评估了具有烷基二胺侧链各种取代模式的5-甲基吲哚并[3,2- c ]喹诺酮(IQc)库的G-四链体(G4)结合方式和效率。荧光共振能量转移解链分析表明,杂芳族核中带有正电荷的IQcs和两个弱碱性侧链是有效的和选择性的人类端粒(HT)和基因启动子G4稳定剂。以HT G4为模型的光谱研究表明,IQc稳定复合物涉及两个IQc分子(2,9-双[3-(二乙基氨基)丙基]氨基} -5-甲基-11 H-吲哚[3, 2 c ]喹啉5氯化铵,3 d)每个G4单位,位于两个非独立但等效的结合位点。分子动力学研究表明,3 d的末端堆积诱导了G4结构的构象重排,从而驱动了第二个3 d配体与G4凹槽的结合。建模研究还表明,具有两个三碳侧链的3 d具有合适的几何形状,可通过侧链的末端氮原子参与直接或水介导的氢键结合到磷酸盐骨架和/或G4环上。此外,抗增殖研究表明IQc化合物2 d(2-[3-(二乙基氨基)丙基]氨基}