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通过1.8 MDa的CUL9 E3结合酶复合体的非正规组合,化和仿真的库林-RING/RBR无处不在
Daniel Horn-Ghetko1, Linus V M Hopf1,2, Ishita Tripathi-Giesgen1,2
1Department of Molecular Machines and Signaling, Max Planck Institute of Biochemistry, Martinsried, Germany.
Nature structural & molecular biology
|April 11, 2024
概括
CUL9-RBX1复合体独特地结合了cullin-RING和RBR域,使其无处不在. 这种特定于脊椎动物的E3结合酶使用化来激活,揭示了全方位转移的新机制.
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:
- 乌比基结合对于细胞过程至关重要,主要由具有明显催化域的E3结合酶介导,如cullin-RING和RBR.
- 脊椎动物特异组合的CUL9复合体,独特地整合了cullin-RING和RBR域,并通过TP53相互作用参与瘤抑制.
研究的目的:
- 阐明人类CUL9-RBX1复合物的结构和机制.
- 了解双重cullin-RING和RBR域如何在无处不在中合作.
- 调查化在CUL9复合体激活中的作用.
主要方法:
- 电子显微镜 (cryo-EM) 用于确定1.8MDa的六边形组件结构.
- 生物化学测试用于研究酶活性和相互作用.
- 细胞测试以验证功能角色.
主要成果:
- 六美体CUL9-RBX1复合体的详细结构阐明.
- 通过对CUL9林域的转作用基化来证明E2结合的RBR域激活.
- 确定UBE2F作为CUL9的甲状动物特异性无化酶,其中RBR域阻止了无化.
- CUL9的特征是作为一个自我组装的,仿真的cullin-RING/RBR E3结合酶.
结论:
- CUL9-RBX1复合体代表了一个独特的E3结合酶架构,结合了cullin-RING和RBR域.
- 由UBE2F介导的化对于CUL9-RBX1的激活和功能至关重要.
- 通过自我组装和域合作,CUL9-RBX1表现出一种新的E3结合酶活性机制.
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