探索内在无序的蛋白质-蛋白质相互作用的结合性自由能量场景:洞察涉及白血病的AF9-BCOR复合体
1Department of Chemistry and Biochemistry, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53211, USA. sharma69@uwm.edu.
Physical chemistry chemical physics : PCCP
|May 1, 2025
概括
针对MLL重组白血病中的AF9-BCOR相互作用显示出有希望. 一种新的分子动力学方法揭示了突变如何影响蛋白质结合,为白血病药物发现提供了新的途径.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 计算化学的计算化学
背景情况:
- 涉及混合血统白血病 (MLL) 基因的染色体重组是侵袭性急性白血病的关键驱动因素.
- MLL-AF9融合蛋白异常地招募转录和表观遗传综合体,促进瘤发生.
- AF9蛋白与BCL-6核心压缩剂 (BCOR) 的相互作用至关重要,特定突变取消了白血病潜力.
研究的目的:
- 通过分子动力学模拟,研究野生类型 (WT) 和突变型 (MT) AF9-BCOR复合物的结合性自由能景观 (BFEL).
- 了解AF9-BCOR复合体形成过程中内在无序区域 (IDR) 的结构动态.
- 为了确定AF9-BCOR相互作用中的潜在治疗点,用于治疗白血病.
主要方法:
- 采用了混合方法,结合了传统和复制交换分子动力学 (REMD) 模拟.
- 分析了WT和突变AF9-BCOR复合体的构造变化和结合的自由能量场景.
- 单独模拟WT AF9以评估内在结构稳定性和突变效应.
主要成果:
- 对WT AF9的REMD模拟显示了β-sheet的显著损失,由于非本地接触而导致的突变加速.
- WT AF9-BCOR复合体的BFEL显示了局部最小值,表明C端BCOR相互作用是潜在的治疗标.
- 突变破坏了原生AF9-BCOR相互作用,导致结合亲和力较差.
结论:
- 这项研究阐明了AF9和BCOR之间的相互作用动态,这对于MLL重组型白血病至关重要.
- 介绍了一种用于绘制蛋白质-蛋白质相互作用能量景观的新计算方法.
- 研究结果为开发针对性抗白血病药物设计策略提供了宝贵的见解.
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