对CAND1介导的SCF基质受体交换的结构和机制见解
Mohammed Shaaban1, Julie A Clapperton1, Shan Ding1
1The Visual Biochemistry Laboratory, The Francis Crick Institute, 1 Midland Road, NW1 1AT London, UK.
Molecular cell
|June 20, 2023
概括
人类CAND1蛋白促进SCF E3酶中基质受体的交换,这对细胞调节至关重要. 冷-EM揭示了CAND1和DCNL1如何相互作用以控制SCF复杂的动态和基质周转.
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 生化学
背景情况:
- SCF (SKP1-CUL1-Fbox) 泛素E3酶对于通过基质降解调节细胞通路至关重要.
- 可变的SKP1-Fbox基质受体 (SR) 模块允许SCF连接酶准不同的基质.
- 对于这些SR模块的有效交换,CAND蛋白质至关重要.
研究的目的:
- 阐明CAND1介导的SR交换在SCF泛基因E3链酶中的结构机制.
- 了解在SR动态过程中CAND1,SCF和DCNL1之间的分子相互作用.
- 为CAND-SCF法规提供详细的结构模型.
主要方法:
- 人类CAND1驱动交换反应的复制,涉及基质结合的SCF,DCNL1和SRs.
- 电子显微镜 (cryo-EM) 用于可视化结构中间体.
- 功能生物化学测试,以补充结构性发现.
主要成果:
- 关键中间体的高分辨率结构,包括三元CAND1-SCF复合体.
- 详细可视化SR和CAND1分裂中间体的详细可视化.
- 在CUL1/RBX1中识别CAND1诱导的构造变化,以优化DCNL1结合.
- 在CAND1-SCF动态中发现DCNL1的双重作用.
- 在冷却和滴解过程中CAND1位移的结构基础.
结论:
- 结合CAND1诱导SCF的结构变化,促进SR交换和DCNL1相互作用.
- DCNL1在调节CAND1-SCF复杂动态方面发挥着多方面的作用.
- 库林缩是导致CAND1移位的关键事件,完成了调节周期.
- 该研究为CAND-SCF法规提供了一个全面的结构和功能模型.
相关概念视频
Assembly of Signaling Complexes
5.8K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
5.8K
Protein Complexes with Interchangeable Parts
2.6K
Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
2.6K
Pinching-off of Coated Vesicles
3.2K
Vesicle budding is orchestrated by distinct cytosolic proteins such as adaptor proteins, coat proteins, and GTPases. To initiate vesicle budding, membrane-bending proteins containing crescent-shaped BAR domains bind to the lipid heads in the bilayer and distort the membrane to form a protein-coated vesicle bud. Adaptors proteins such as AP2 for clathrin-coated vesicles can nucleate on the deformed membrane. Finally, coat proteins such as clathrin or COPI and COPII assemble into a coat forming...
3.2K
Clathrin Coated Vesicles
7.1K
Clathrin-coated vesicles use endocytosis to transport receptors and lysosomal hydrolases from the Golgi to the lysosome in the late secretory pathway. Clathrin-mediated endocytosis was the first described endocytic process, and Clathrin-coated vesicles remain one of the most well-studied transport vesicles. The molecular machinery that generates clathrin-coated vesicles comprises over 50 proteins that precisely coordinate vesicle formation. Cell surface receptors concentrated in indented sites...
7.1K
Ligand Binding and Linkage
4.8K
Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked. In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
4.8K
COP Coated Vesicles
7.9K
Membrane-enclosed structures called vesicles transport proteins and lipids across the cell. The vesicles derive their cargo from the plasma membrane, Golgi, ER, or endosome. Coated vesicles are spherical, protein-coated carriers with a 50–100 nm diameter that mediate bidirectional transport between the ER and the Golgi. The distribution of proteins between the ER and Golgi complex is dynamic and is maintained by different coated vesicles. Their formation is driven by the assembly of...
7.9K


