靶点 EGFRL858R EGFRL858R/T790M

IC50 2 nM 8 nM

体外研究 WZ4002也抑制其他EGFR基因型，如作用于E746_A750和E746_A750/T790M时IC50分别为2和6 nM。WZ4002作用于野生型EGFR时IC50为32 nM。WZ4002作用于非小细胞肺癌（NSCLC）细胞时抑制EGFR, AKT和ERK1/2的磷酸化作用。WZ4002作用于表达不同EGFRT790M突变等位基因的NIH-3T3细胞时抑制EGFR的磷酸化作用。测定激酶的解离常数，WZ4002作用下的实验组比DMSO作用下的对照组高95%。WZ4002由于在C2苯胺取代时获得一个正甲氧基团，因而作用于EGFR比WZ3146效果更高。与喹唑啉类抑制剂相比，WZ4002作用于野生型EGFR磷酸化作用的效果要低100倍。WZ4002抑制重组L858R/T790M蛋白EGFR激酶活性的效果比抑制野生型EGFR高很多，而HKI-272和Gefitinib的抑制效果刚好与WZ4002相反。[1]此外,抗Src TKI的H1975细胞和HCC827细胞的EGFR的磷酸化完全被第三代EGFR TKI, WZ4002抑制。

体内研究 处理含有T790M突变鼠模型2周，用于研究WZ4002的功效，发现与对照组相比WZ4002处理导致明显的肿瘤退化。[1]用低剂量WZ4002,和高剂量WZ4002处理，导致平均摄取分别下降26%和36%。

The structure of EGFR contains the extracellular domains and transmembrane domains. Among them, the intracellular domain is mainly divided into different parts including juxtamembrane domain, tyrosine kinase domain, and regulatory region domain. The tyrosine kinase domain of EGFR consists of the N-lobe and C-lobe flanking the activation loop and active site cleft. Threonine 790 is the gatekeeper residue of EGFR, which locates at the entrance to a hydrophobic pocket in the back of the ATP binding cleft and thus determines inhibitor specificity in protein kinases. Substitution of threonine 790 with methionine (T790M) causes resistance by steric interference with binding of tyrosine kinase inhibitors.  

The crystal structure reveals the covalent binding of WZ4002 to the ATP-binding cleft of EGFR T790M mutant. The covalent bond is formed between Cys797 and the acrylamide group of WZ4002. Non-covalent interactions also enhance the affinity between WZ4002 and kinase domain. The anilinopyrimidine core of WZ4002 forms a bidentate hydrogen bonding interaction with Met793, and the chlorine substituent on the pyrimidine ring contacts Met790, the mutant gatekeeper residue. Besides, the aniline ring also contacts the α-carbon of Gly796 via a hydrophobic interaction, with its methoxy substituent extending toward Leu792 and Pro794 in the hinge region. Furthermore, the ‘linker’ phenyl ring lies roughly perpendicular to the pyrimidine core, and this orientation juxtaposes the acrylamide with the thiol of Cys797 for covalent bond formation. The interactions determine the potency and relative selectivity of WZ4002 for EGFR T790M. 

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