The protein-protein interaction between menin and mixed-lineage leukemia 1 (MLL1) plays an important role in development of acute leukemia with translocations of the MLL1 gene and in solid tumors. Here, we report the development of a new generation of menin-MLL1 inhibitors identified by structure-based optimization of the thienopyrimidine class of compounds. This work resulted in compound 28 (MI-1481), which showed very potent inhibition of the menin-MLL1 interaction (IC50 = 3.6 nM), representing the most potent reversible menin-MLL1 inhibitor reported to date. The crystal structure of the menin-28 complex revealed a hydrogen bond with Glu366 and hydrophobic interactions, which contributed to strong inhibitory activity of 28. Compound 28 also demonstrates pronounced activity in MLL leukemia cells and in vivo in MLL leukemia models. Thus, 28 is a valuable menin-MLL1 inhibitor that can be used for potential therapeutic applications and in further studies regarding the role of menin in cancer.

中文翻译：

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阻断二价蛋白质-蛋白质相互作用的复杂性：Menin-混合谱系白血病相互作用的高效抑制剂的开发。

menin 和混合谱系白血病 1 (MLL1) 之间的蛋白质-蛋白质相互作用在具有 MLL1 基因易位的急性白血病和实体瘤的发展中起着重要作用。在这里，我们报告了新一代 menin-MLL1 抑制剂的开发，该抑制剂是通过基于噻吩并嘧啶类化合物的结构优化确定的。这项工作产生了化合物 28 (MI-1481)，它显示出对 menin-MLL1 相互作用的非常有效的抑制作用（IC50 = 3.6 nM），代表了迄今为止报道的最有效的可逆 menin-MLL1 抑制剂。menin-28 复合物的晶体结构揭示了与 Glu366 的氢键和疏水相互作用，这有助于 28 的强抑制活性。化合物 28 在 MLL 白血病细胞和 MLL 白血病模型体内也表现出明显的活性。因此，