阿波-APC/C和APC/CCDH1:EMI1复合体的冷-EM结构为APC/C调节提供了洞察力
Anna Höfler1, Jun Yu1, Jing Yang2
1Department of Molecular and Cellular Biology, University of Geneva, Geneva, Switzerland.
Nature communications
|November 20, 2024
概括
对酶促进复合体/循环体 (APC/C) 的结构洞察力揭示了其对细胞分裂的调节. 新的冷EM结构阐明了APC/CCDH1:EMI1复合体和apo-APC/C,详细介绍了关键的监管元素.
科学领域:
- 细胞生物学 细胞生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 亚纳酶促进复合物/循环体 (APC/C) 是一个关键的E3泛素酶复合物,它控制细胞循环的进展.
- APC/C活性受到联合激活剂 (CDC20,CDH1),抑制剂 (EMI1),翻译后修饰和检查点综合体的严格调节.
- 了解APC/C结构对于理解其在细胞分裂和相关疾病中的作用至关重要.
研究的目的:
- 使用冷电子显微镜 (cryo-EM) 确定人类APC/CCDH1:EMI1和apo-APC/C的高分辨率结构.
- 为管理APC/C活动的监管机制提供原子层面的见解.
- 确定有助于APC/C组装和功能的新型结构特征.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来解析人类APC/CCDH1:EMI1和apo-APC/C的结构.
- 高分辨率的结构地图分别在2.9 Å和3.2 Å生成.
- 使用AlphaFold预测来建模内在无序的区域.
主要成果:
- 该研究确定了人类APC/CCDH1:EMI1和apo-APC/C的高分辨率结构.
- 在三元复合体内的CDH1中发现了一种新的N端α螺旋 (CDH1α1).
- 在APC2中发现了一种结合模块,增强了复合体的稳定性,离子在实验中得到证实.
- 在APC/C子单位中模拟了内在无序的区域,暗示了组装和调节中的角色.
结论:
- 高分辨率结构为APC/C监管提供了前所未有的洞察力.
- 已识别的结构特征,包括CDH1α1和APC2结合模块,对于APC/C功能至关重要.
- 这些发现提升了我们对细胞循环控制和潜在治疗点的理解.
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