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Q221
R222N223基序的动态区域是构象转换,控制Mcl-1泛素化。Noxa 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 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 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。