KBTBD4 癌症热点突变驱动HDAC1/2核心压缩机复合体的新形降解
bioRxiv : the preprint server for biology
|May 27, 2024
概括
在 KBTBD4 中的癌症突变通过导致 CoREST 的异常降解来驱动脑髓母细胞瘤. 这项研究揭示了突变如何与HDAC1/2产生新的相互作用,为儿科脑瘤提供治疗点.
科学领域:
- 在瘤学瘤学.
- 结构生物学 结构生物学
- 分子生物学分子生物学
背景情况:
- 对于CULLIN3-RBX1 E3泛素结合酶的基质受体KBTBD4的反复突变,在髓母细胞瘤 (MB) 和松母细胞瘤中发现.
- 这些突变导致功能的增加,促进转录核心压缩器CoREST的异常降解,但机制尚不清楚.
研究的目的:
- 阐明 KBTBD4 突变促进 CoREST 降解的机制.
- 为了确定KBTBD4突变体及其新型标之间的特定相互作用,HDAC1/2.2.
- 探索针对异常KBTBD4-HDAC1相互作用的治疗策略.
主要方法:
- 深度突变扫描绘制KBTBD4突变格局的地图.
- 低温电子显微镜 (cryo-EM) 用于确定结合LSD1-HDAC1-CoREST的KBTBD4突变体的结构.
- 在体外测试和脑髓母细胞瘤模型来测试治疗干预措施.
主要成果:
- KBTBD4突变通过参与HDAC1/2.2.4促进了CoREST的退化.
- 结构分析显示,KBTBD4形成一个同分体,与HDAC1结合,突变稳定了这个接口.
- 功能获取突变被映射出来,显示了对插入和替换的特定偏好.
- 发现分子UM171和HDAC1/2抑制剂破坏了突变KBTBD4-HDAC1相互作用,并抑制了瘤生长.
结论:
- 阐明了癌症突变驱动的新型蛋白-蛋白相互作用的机制基础,其中包括KBTBD4,HDAC1/2和CoREST.
- 证明HDAC1/2抑制剂可以阻止突变KBTBD4-HDAC1相互作用,CoREST降解和KBTBD4-突变MB生长.
- 确定了针对异常E3-新基质接口的潜在治疗策略,用于儿科脑瘤治疗.
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