原生蛋白质复合体对向蛋白质降解的贡献
Lorraine Glennie1, Nicole Curnutt2, Tyrell Cartwright1
1Medical Research Council Phosphorylation & Ubiquitylation Unit (MRC-PPU), School of Life Sciences, University of Dundee, Dow Street, Dundee, DD1 5EH, Scotland, UK.
bioRxiv : the preprint server for biology
|July 16, 2025
概括
向蛋白质降解 (TPD) 通过利用分子粘剂,在复合体内共同降解蛋白质. 这项研究表明,CK1α-SACK1复合体一起降解,突出了TPD策略中蛋白质背景的重要性.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 药物发现 药物发现 药物发现
背景情况:
- 向蛋白降解 (TPD) 使用细胞机械来降解感兴趣的蛋白质 (POI).
- 蛋白质通常在多蛋白质复合体中起作用,影响降解结果.
- 一个POI的宏分子背景可能会影响TPD疗效.
研究的目的:
- 使用分子降解剂研究CK1α-SACK1(A-H) 复合物的降解.
- 探索宏分子环境如何影响向蛋白质降解结果.
- 评估CK1α相互作用在SACK1蛋白共同降解中的作用.
主要方法:
- 使用了利胺衍生降解剂 (DEG-77,SJ3149) 针对CK1α.
- 对CK1α-SACK1(A-H) 复合物的同降解试验.
- 研究了患有CK1α结合缺陷SACK1G突变的患者衍生细胞的降解.
- 对CK1α,CUL4ACRBN E3结合酶和蛋白质组的评估要求.
主要成果:
- DEG-77和SJ3149与CK1α共同降解了多个SACK1 ((A-H) 蛋白.
- 降解SACK1 (A-H) 蛋白需要CK1α,CUL4ACRBN以及蛋白质组.
- 在患者细胞中,DEG-77降解了CK1α和SACK1D,但没有突变的SACK1GR265P,证实了相互作用依赖性.
结论:
- 一个POI的宏分子环境显著影响向蛋白质降解.
- CK1α-SACK1(A-H) 复合体的降解取决于CK1α的相互作用.
- 这项研究强调了TPD在选择性降解蛋白质复合体方面的潜力.
相关概念视频
Regulated Protein Degradation
7.7K
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...
7.7K
The Proteasome
9.1K
Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst 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. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
9.1K
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
Export of Misfolded Proteins out of the ER
3.9K
After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
3.9K
Protein Complex Assembly
10.9K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
10.9K
The Proteasome Structure
982
The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
The proteasome is an...
The proteasome is an...
982


