测试CRL4DCAF12与MAGEA3和CCT5二C终端降解子的相互作用
Germanna Lima Righetto1,2, Yanting Yin3, David M Duda3
1Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada.
损坏的DNA结合蛋白-1 (DDB1) 和CUL4关联因子12 (DCAF12) 识别了MAGEA3和CCT5蛋白的C终端降解子. 一个冷EM结构揭示了DCAF12结合相互作用,使新的药物开发策略成为可能.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 损坏的DNA结合蛋白-1 (DDB1) 和CUL4关联因子12 (DCAF12) 是Cullin4-RING E3结合酶 (CRL4) 综合体中的基质受体.
- 通过ubiquitin-proteasome系统,CRL4复合体调解基质降解.
- 黑色素瘤相关抗原3 (MAGEA3) 和T复合蛋白1亚单元epsilon (CCT5) 是已识别的DCAF12的基质.
研究的目的:
- 描述DCAF12及其基质MAGEA3和CCT5.5之间的相互作用.
- 阐明DCAF12介导基质识别的结构基础.
- 为开发针对DCAF12的小分子提供治疗应用的工具.
主要方法:
- 使用了生物物理测定和基于近距离的NanoBRET测定.
- 使用冷电子显微镜 (cryo-EM) 来确定DDB1-DCAF12-MAGEA3复合物的结构.
主要成果:
- DCAF12与MAGEA3和CCT5的C端降解结合,具有纳米分子亲和力.
- 生物物理和细胞分析在体外和细胞内证实了这些相互作用.
- 3.17 Å的冷-EM结构揭示了关键的DCAF12残留物,这些残留物参与了降解识别.
结论:
- DCAF12直接识别了MAGEA3和CCT5.5的C端降解子.
- 这些结构性见解为设计针对DCAF12的治疗方法提供了基础.
- 这项工作通过在DCAF12.上识别可用药的位点,促进了化向仿真体 (PROTACs) 的开发.
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