UM171和KBTBD4新型癌症突变的融合机制

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Updated: May 28, 2025

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Xiaowen Xie^1,2, Olivia Zhang^3,4, Megan J R Yeo^3,4

¹Department of Pharmacology, University of Washington, Seattle, WA, USA.

Nature

|February 12, 2025

概括

KBTBD4中的癌症突变通过改变蛋白相互作用来驱动脑髓母细胞瘤. 这些突变通过与HDAC1/ 2的新发现相互作用导致 CoREST 的异常降解. 这一发现为儿童大脑瘤提供了新的治疗点.

科学领域:

癌症学
分子生物学
结构生物学

背景情况:

癌症突变可以产生新的蛋白质相互作用,
基质受体KBTBD4在CULLIN3-RING E3泛素酶复合体中经常发生突变,导致功能增加.
这些KBTBD4突变诱导转录核心压缩剂CoREST的降解,但底层机制尚不清楚.

研究的目的:

阐明 KBTBD4 突变促进 CoREST 降解的机制.
描述KBTBD4突变在髓母细胞瘤中的结构和功能后果.
确定针对KBTBD4- HDAC1相互作用的潜在治疗策略.

主要方法:

进行深度突变扫描以绘制KBTBD4癌症热点.
用冷电子显微镜测定结合LSD1-HDAC1-CoREST的KBTBD4突变体的结构.
在体外测试以评估突变对蛋白相互作用和细胞增殖的影响.

主要成果:

通过将HDAC1/2作为直接目标,KBTBD4突变促进了CoREST的降解.
深度突变扫描揭示了特定的突变偏好驱动功能的增长.
化EM结构显示KBTBD4同位体不对称地结合HDAC1,突变通过插入HDAC1活性部位来稳定接口.
分子UM171和HDAC1/ 2抑制剂通过破坏突变KBTBD4- HDAC1相互作用和抑制癌细胞增殖,显示出治疗潜力.

结论:

KBTBD4突变通过与HDAC1/ 2的新型相互作用驱动脑髓母细胞瘤,导致CoREST降解.
结构和突变分析提供了针对这种异常相互作用的机制基础.
用抑制剂或分子接剂向KBTBD4-HDAC1接口代表了对KBTBD4突变髓母细胞瘤的有希望的治疗途径.

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