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Published on: May 21, 2019
通过ADP-ribosylation调节蛋白质酶的调节
Park F Cho-Park1, Hermann Steller
1Strang Laboratory of Apoptosis and Cancer Biology, Howard Hughes Medical Institute, The Rockefeller University, New York, NY 10021, USA.
Cell
|April 30, 2013
概括
ADP-ribosylation通过修改PI31,一个调节器来增强26S蛋白酶体活性. 这个过程涉及坦基酶 (TNKS),并促进26S蛋白质组的组装,这对细胞存活至关重要,并且与疾病有关.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 无素-蛋白酶体系统 (UPS) 对于细胞平衡至关重要,降解无素蛋白质.
- UPS中的功能障碍与癌症和神经退行性疾病等疾病有关.
- 26S蛋白酶体是UPS内部的主要蛋白质分解机器.
研究的目的:
- 研究ADP-ribosylation在调节26S蛋白酶体活性中的作用.
- 确定参与这种调节机制的分子参与者.
- 探索与蛋白质酶功能障碍相关的疾病的潜在治疗点.
主要方法:
- 使用了Drosophila和人类细胞系.
- 使用共免疫沉和结合试验识别了蛋白质与蛋白质的相互作用.
- 评估了蛋白酶体活动和组合.
- 使用RNA干扰 (RNAi) 和小分子抑制剂 (XAV939) 调节坦基拉酶 (TNKS) 活性.
主要成果:
- 发现ADP-ribosylation可以促进Drosophila和人类细胞中的26S蛋白酶活性.
- 坦基拉酶 (TNKS) 和19S组合伴侣 (dp27,dS5b) 被确定为PI31的直接结合伙伴.
- 通过TNKS介导的PI31的ADP-ribosylation降低了它对20S蛋白质酶的亲和力,缓解了抑制.
- PI31的修改还通过隔离dp27和dS5b来促进26S组合.
结论:
- 通过TNKS进行ADP-ribosylation是一种调节26S蛋白酶组合和活性的新机制.
- 用像XAV939这样的抑制剂准TNKS可以调节蛋白质酶体功能.
- 这种调节途径为与蛋白质酶功能障碍相关的疾病提供了潜在的治疗策略.
相关概念视频
The Proteasome
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 (ubiquitin...
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 (ubiquitin...
The Proteasome
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...
The Proteasome
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...
Regulated Protein Degradation
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...
Regulated Protein Degradation
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...
Covalently Linked Protein Regulators
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.
