调查p21乌比奎丁独立的Degron揭示了一个调节p21降解和功能的双Degron模块
Marianna Riutin1, Pnina Erez1, Julia Adler1
1Department of Molecular Genetics, Weizmann Institute of Science, Rehovot P.O. Box 26, Israel.
Cells
|October 15, 2024
概括
像p21这样的内在无序的蛋白质被20S蛋白质组降解,而不依赖于ubiquitin. 一个特定的p21区域 (RRLIF框) 针对它进行降解,影响细胞周期和衰老.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 内在失序蛋白 (IDP) 通过20S蛋白质组经历无素独立的降解.
- 在20S蛋白质组上的PSMA3捕获者域调解与IDP的相互作用.
- 特定的IDP相互作用部位在蛋白质体降解和细胞功能中的作用尚未完全理解.
研究的目的:
- 为了调查IPD和PSMA3捕捉器之间的相互作用的生物学意义.
- 确定IPPp21的特定区域,负责PSMA3捕获器相互作用及其在降解中的作用.
- 阐明改变p21降解对细胞周期和衰老的功能后果.
主要方法:
- 分解露西法酶记者试验以检测蛋白相互作用.
- 位点定向的突变发生,以识别p21 RRLIF框.
- 在HEK293和HeLa细胞中进行CRISPR-Cas9基因组编辑,以修改p21 RRLIF框.
- 对p21半衰期,细胞周期进展和衰老标记基因表达的分析.
主要成果:
- 鉴定出p21 RRLIF盒是PSMA3 Trapper相互作用的关键媒介.
- 删除或突变p21 RRLIF框显著增加p21半衰期.
- 编辑的细胞表现出异常的细胞循环模式和增强的衰老特征基因表达后DNA损伤.
- 发现增加的p21半衰期,而不是蛋白质水平,可以调节衰老.
结论:
- p21 RRLIF盒子作为无素独立的降解剂,与PSMA3捕获器相互作用.
- p21具有双降解模块,结合了依赖于全方位的和独立的降解途径.
- 这种双降解系统在调节p21降解及其对衰老等细胞过程的影响方面发挥着至关重要的作用.
相关概念视频
Regulated Protein Degradation
7.2K
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...
7.2K
Negative Regulator Molecules
35.2K
Positive regulators allow a cell to advance through cell cycle checkpoints. Negative regulators have an equally important role as they terminate a cell’s progression through the cell cycle—or pause it—until the cell meets specific criteria.
35.2K
Inhibition of Cdk Activity
4.7K
The orderly progression of the cell cycle depends on the activation of Cdk protein by binding to its cyclin partner. However, the cell cycle must be restricted when undergoing abnormal changes. Most cancers correlate to the deregulated cell cycle, and since Cdks are a central component of the cell cycle, Cdk inhibitors are extensively studied to develop anticancer agents. For instance, cyclin D associates with several Cdks, such as Cdk 4/6, to form an active complex. The cyclin D-Cdk4/6 complex...
4.7K
Abnormal Proliferation
4.5K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.5K
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
Covalently Linked Protein Regulators
6.8K
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....
6.8K


