Deactivation of Mcl-1 by Dual-Function Small-Molecule Inhibitors Targeting the Bcl-2 Homology 3 Domain and Facilitating Mcl-1 Ubiquitination
作者:Ting Song、Ziqian Wang、Fangling Ji、Yingang Feng、Yudan Fan、Gaobo Chai、Xiangqian Li、Zhiqiang Li、Zhichao Zhang
DOI:10.1002/anie.201606543
日期:2016.11.7
leading to the inhibition of ubiquitination. A dual function Mcl‐1 inhibitor, which locates at the BH3 domain of Mcl‐1 and forms hydrogen bond with His224 to drive a helical QRN conformation, so that it not only interferes with the pro‐apoptotic partners, but also facilitates Mcl‐1 ubiquitination in living cells, is described. As a result, this inhibitor manifests a more effective apoptosis induction
通过有限的蛋白水解测定,三维NMR,X射线晶体学和丙氨酸突变,已确定Mcl-1的Bcl-2同源3(BH3)域中Q221R222N223基序的动态区域是构象转换,控制Mcl-1泛素化。Noxa BH3结合使QRN基序偏向螺旋构象,从而导致Mcl-1的体外泛素化增强。相比之下,Bim BH3结合使QRN基序偏向非螺旋构象,从而导致泛素化的抑制。Mcl-1双重功能抑制剂,位于Mcl-1的BH3结构域并与His224形成氢键以驱动螺旋QRN构象,因此它不仅干扰促凋亡伴侣,而且促进Mcl-1描述了活细胞中的泛素化。结果,这种抑制剂在Mcl-1依赖性癌细胞中表现出比其他具有相似结合亲和力的抑制剂更有效的凋亡诱导作用。