PARP7是一种蛋白质毒性应激传感器,它标记蛋白质进行降解
Nonso J Ikenga1, Jörg Vervoorts1, Bernhard Lüscher1
1Institute of Biochemistry and Molecular Biology, RWTH Aachen University, Aachen, Germany.
The EMBO journal
|August 20, 2025
概括
细胞ADP-ribosylation在蛋白质毒性压力期间增加,导致蛋白质聚合和通过自的降解. 抑制PARP7会破坏这个过程,突出显示它在应激反应中的作用.
科学领域:
- 细胞生物学 细胞生物学
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- ADP-ribosylation是一种关键的翻译后修饰,涉及到细胞应激反应.
- 蛋白质毒性压力引发细胞ADP-核糖化增加,导致蛋白质积累.
- 在压力期间,ADP-ribosylated蛋白在细胞质焦点中与ubiquitin和p62聚合.
研究的目的:
- 研究ADP-ribosylation在细胞对蛋白质毒性压力的反应中的作用.
- 为了阐明ADP-ribosylated蛋白处理和降解的机制.
- 为了确定PARP7在蛋白质毒性压力诱导的ADP-ribosylation中的参与.
主要方法:
- 在蛋白质毒性压力条件下观察蛋白质聚合和局部化.
- 分析蛋白质溶解度和无处不在状态.
- 抑制Poly ((ADP-ribose) 聚合酶7 (PARP7) 以评估其对ADP-ribosylation的影响.
主要成果:
- ADP-ribosylated蛋白质积聚在细胞质焦点中,随后被运送到侵略体以进行自降解.
- 在ADP-ribosylated蛋白质的有效清除中,ubiquitination是至关重要的.
- 在蛋白质毒性压力期间,抑制PARP7会损害单基ADP-ribosyl化蛋白质的积累.
- 在蛋白质毒性压力下,PARP7稳定,作为传感器.
结论:
- 通过促进蛋白质降解或分离,ADP-ribosylation在管理蛋白质毒性压力方面发挥着重要作用.
- 在清除ADP-ribosylated蛋白质时,ubiquitination是不可或缺的.
- 在细胞对蛋白质毒性压力的反应中,PARP7起到关键的传感器和调解器的作用,挑战了高度特异性的ADP-ribosylation的概念.
- ADP-ribosylation的乱交性质可能是防止错误折叠蛋白质导致细胞损伤的关键.
相关概念视频
Regulation of the Unfolded Protein Response
2.6K
Inositol-requiring kinase one or IRE1 is the most conserved eukaryotic unfolded protein response (UPR) receptor. It is a type I transmembrane protein kinase receptor with a distinctive site-specific RNase activity. As the binding mechanics of the misfolded proteins with the N-terminal domain of IRE-1 are unclear, three binding models — direct, indirect, and allosteric -- are proposed for receptor activation. Nevertheless, it is known that once a misfolded protein associates with IRE1, it...
2.6K
The Unfolded Protein Response
5.1K
The ER is the hub of protein synthesis in a cell. It has robust systems to quality control protein folding and also for degradation of terminally misfolded proteins. Under normal conditions, a small proportion of misfolded proteins that cannot be salvaged need to be transported to the cytoplasm by the ER-associated degradation or ERAD pathways. However, if the ERAD cannot handle the misfolded proteins, the cell activates the unfolded protein response or UPR to adjust the protein folding...
5.1K
Covalently Linked Protein Regulators
7.1K
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....
7.1K
Regulated Protein Degradation
7.6K
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...
7.6K
The Proteasome
1.1K
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...
1.1K
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


