Article
作者: Zhou, Guizhen ; Wu, Shuyao ; Lin, Mengjia ; Ding, Chunyong ; Xiao, Xuanzheng ; Ye, Youqiong ; Liu, Xiaogu ; Xu, Ke ; Guo, Rey-Ting ; Yuan, Kun ; Zhai, Xiaotong ; Li, Na ; Zhao, Huixin ; Wu, Jun ; Lian, Zhengke ; Jin, Jianping ; Liu, Mingyao ; Pang, Xiufeng ; Xia, Xinting ; Bao, Rujuan ; Min, Jian ; Ma, Buyong ; Li, Dali ; Hu, Longmiao ; Shen, Panpan ; Feng, Juanjuan ; Gong, Xinqi ; Li, Kangkang ; Zhang, Ao ; Hu, Kewen ; Wu, Zhengzhen ; Shi, Xinyi ; Zhang, Sulin ; Tang, Weiying
KRAS remains a challenging therapeutic target with limited effective inhibitors currently available. Here, we report the discovery of MCB-294, a potent dual-state pan-KRAS inhibitor capable of binding both the active (GTP-bound) and inactive (GDP-bound) forms of KRAS. MCB-294 engages the switch-II pocket through a water-mediated hydrogen-bond network and selectively inhibits KRAS over NRAS and HRAS. It effectively suppresses oncogenic KRAS signaling, inhibits the growth of KRAS-dependent cancer cells and patient-derived organoids, and reduces tumor progression in multiple preclinical models. MCB-294 also demonstrates superior activity compared to the inactive-state selective pan-KRAS inhibitor Bl-2865 and the KRASG12D inhibitor MRTX1133. Building upon MCB-294 as a pan-KRAS-targeting warhead, we further develop MCB-36, a von Hippel-Lindau (VHL)-recruiting pan-KRAS degrader that induces sustained KRAS degradation. Notably, both MCB-294 and MCB-36 effectively suppress KRASG12C inhibitor-resistant cancer cells and remodel the tumor immune microenvironment. These findings highlight a promising therapeutic strategy for broadly targeting KRAS-driven tumors and overcoming drug resistance.