Launching Spiking Ligands into a Protein–Protein Interface: A Promising Strategy To Destabilize and Break Interface Formation in a tRNA Modifying Enzyme
作者:Florian Immekus、Luzi Jakob Barandun、Michael Betz、François Debaene、Stéphanie Petiot、Sarah Sanglier-Cianferani、Klaus Reuter、François Diederich、Gerhard Klebe
DOI:10.1021/cb400020b
日期:2013.6.21
interactions by small molecules in oligodomain enzymes opens new perspectives for innovative therapeutics. tRNA–guanine transglycosylase (TGT), a potential target to treat shigellosis, is active only as the homodimer. Consequently, disruption of the dimer interface by small molecules provides a novel inhibition mode. A special feature of this enzyme is the short distance between active site and rim of the
除了对蛋白质功能的竞争性活性位点抑制外,寡结构域酶中小分子对蛋白质间相互作用的干扰为创新治疗方法开辟了新的前景。tRNA-鸟嘌呤转糖基酶(TGT)是治疗志贺菌病的潜在靶标,仅作为同型二聚体起作用。因此,小分子破坏二聚体界面提供了一种新颖的抑制模式。该酶的一个特殊特征是二聚体界面的活性位点和边缘之间的距离很短。这表明设计了带有刚性,针状取代基的扩展活性位点抑制剂,以突入相互作用界面的潜在热点。合成了带有乙炔基取代基的配体,并用K d表征测量,晶体学,非共价质谱和计算机模拟。与先前确定的具有未扩展活性位点抑制剂的晶体结构相比,参与二聚体界面多次接触的明确定义的环-螺旋基序破裂并暗示一旦结合了加标配体,柔韧性得到了提高。质谱表明溶液中复杂的TGT同型二聚体明显不稳定,但没有完全破坏。由于环-螺旋基序的直接相互作用显然不能决定二聚体的稳定性,因此建议将由几种芳香族氨基酸组成的结构保守的疏水性斑作为