The present article reports on the design and the synthesis of a series of mono- and bis-pyrimidinoacridines and their evaluation as a novel family of quadruplex-binders. It is shown that bispyrimidinoacridines represent an interesting compromise between easy synthetic access and efficiency in terms of quadruplex interaction (both affinic and selective), as judged by G4-FID assay and molecular modelling. The present study also highlights that control of the π-stacking interactions taking place between the ligand and the accessible G-tetrad of a quadruplex-DNA is indeed essential for good recognition but not exclusively (key role of direct and water-mediated H-bonds). The introduction of additional amino side chains, valuable in the acridine series, results here in steric perturbations of the ligand/quadruplex recognition and lowers the quadruplex/duplex selectivity.
本文报道了一系列单
嘧啶和双
嘧啶吖啶的设计和合成,并评估了它们作为新型四联体结合剂的作用。结果表明,根据G4-FID检测和分子建模,双
嘧啶吖啶在易于合成和四联体相互作用(亲和力和选择性)效率之间取得了有趣的平衡。本研究还强调,对
配体与四联体DNA可及G四联体之间π堆积相互作用的控制对于良好识别确实至关重要,但并非唯一(直接和
水介导的氢键的关键作用)。在
吖啶系列中引入额外的
氨基侧链,会导致
配体/四联体识别的空间位阻,并降低四联体/双链的选择性。