对VCP,一个重要的unfoldase和一个deubiquitinase之间的合的结构洞察
Lauren E Vostal1,2, Noa E Dahan1,3, Matthew J Reynolds4
1Laboratory of Chemistry and Cell Biology, The Rockefeller University, New York, NY, USA.
The Journal of cell biology
|March 14, 2025
概括
这项研究揭示了蛋白质降解酶含瓦洛蛋白 (VCP) 和二维基酶VCPIP1如何协调其活动. 它们的相互作用使VCPIP1能够去除无素链,帮助蛋白质稳定和器官组织.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 结构生物学 结构生物学
背景情况:
- 蛋白质静止对于细胞健康至关重要,它依赖于蛋白质降解和循环.
- 含有瓦洛辛的蛋白质 (VCP) 和二维基因酶 (DUB) 是关键的参与者,但它们的协调不清楚.
- VCPIP1,一个与VCP交互的DUB,对Golgi和ER组织至关重要.
研究的目的:
- 阐明VCP-VCPIP1互动和功能协调的结构基础.
- 了解VCPIP1活动在蛋白质稳定过程中是如何由VCP调节的.
主要方法:
- 低温电子显微镜 (cryo-EM) 用于确定VCP-VCPIP1复合物的结构.
- 生物化学测试以评估DUB活动和辅因子竞争.
主要成果:
- 确定VCP-VCPIP1复合体的冷电磁结构,分辨率为3.3 Å.
- 观察到多达三种VCPIP1原体与VCP六合体结合,将催化域定位在VCP的中央孔附近.
- 在VCPIP1和其他VCP辅助因子之间展现出竞争.
- 表明VCP刺激了VCPIP1的二基因酶活性.
结论:
- 这些发现为协调VCP和VCPIP1活动提供了一个结构性机制.
- 这种协调对于调节蛋白质静止和维持器官结构至关重要.
- 这项研究提供了关于DUBs和AAA+ ATPases如何在细胞蛋白质加工中合作的见解.
更多相关视频
10:25Screening Traditional Chinese Medicine Compounds for Inhibiting UCHL3 Activity Based on Molecular Docking and Deubiquitinating Enzyme Probe Technology
Published on: November 22, 2024
212
11:36In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
Published on: July 25, 2019
10.6K
相关概念视频
Covalently Linked Protein Regulators
6.7K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
6.7K
Regulated Protein Degradation
7.1K
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
7.1K
The Proteasome
790
Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
790
Anaphase Promoting Complex
2.8K
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
2.8K
Protein Complexes with Interchangeable Parts
2.5K
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...
2.5K
Pinching-off of Coated Vesicles
3.1K
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...
3.1K
