耐药性脑膜变体保留了与MLL1的高结合亲和力和相互作用
Joshua Ray1, Bradley Clegg2, Jolanta Grembecka2
1Department of Pathology, University of Michigan, Ann Arbor, Michigan, USA.
The Journal of biological chemistry
|September 14, 2024
概括
人体中抗药性突变不会影响MLL1结合,但会与抑制剂产生硬质冲突. 一种特定的突变 (G331D) 减缓了MLL1分裂,这对新的针对性白血病治疗提出了挑战.
科学领域:
- 在瘤学瘤学.
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 梅宁是急性白血病中MLL1融合蛋白的关键辅因子.
- 门-MLL1相互作用抑制剂正在临床试验中,用于治疗白血病.
- 人体内体质突变正在成为对这些抑制剂耐药性的原因.
研究的目的:
- 为了研究患者衍生的脑细胞突变如何影响MLL1结合.
- 通过MLL1.1,从结构上表征menian突变及其与MLL1.1的复合体.
- 了解对针对性治疗的耐药性机制.
主要方法:
- 对具有MLL1.1的meni突变 (T349M,M327I,G331R,G331D) 的结合亲和力的系统性表征.
- 确定与MLL1衍生复合的menin患者突变体的晶体结构.
主要成果:
- 赋予药物耐药性的阴茎突变与MLL1结合部位相邻,并且不会损害MLL1结合.
- 这些突变会诱导与精子抑制剂的固体冲突.
- G331D突变显著减缓了MLL1与menin的解离,使小分子抑制复杂化.
结论:
- 阴茎突变通过干扰药物结合而导致耐药性,而不是MLL1相互作用.
- 结构洞察力指导下一代脑膜抑制剂的开发,以克服抗性.
- G331D突变突出了未来白血病治疗中药物设计的具体挑战.
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