相关实验视频
Updated: May 10, 2026

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In Vitro Ubiquitination and Deubiquitination Assays of Nucleosomal Histones
Published on: July 25, 2019
一个新的DUB使得线性无处不在成为自身毁灭的一方
Reuven Wiener1, Cynthia Wolberger
1Department of Biochemistry and Molecular Biology, the Institute for Medical Research Israel-Canada, Hadassah Medical School, Hebrew University, Jerusalem 91120, Israel.
Cell
|June 11, 2013
概括
研究人员发现了一种新型酶,可以去除线性无素链,这对于核因子 κB 信号传递至关重要. 这种deubiquitinating酶利用一种独特的机制,涉及到ubiquitin本身来打破键.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 线性ubiquitin (Ub) 链是核因子 κB (NF-κB) 信号通路的关键调节者.
- 负责去除线性ubiquitin链的特定deubiquitin化酶仍然未被确定,这阻碍了对NF-κB调节的完全理解.
研究的目的:
- 为了确定专门切割线性ubiquitin链的deubiquitin化酶.
- 阐明这种酶在拆解线性Ub链中使用的催化机制.
主要方法:
- 生物化学试验测试对线性Ub链进行duebiquitinating酶活性.
- 蛋白质净化和鉴定酶的特征.
- 结构和机制研究,以了解酶的作用方式.
主要成果:
- 鉴定了一种具有对线性无素链的特异性的新型无素酶.
- 证明该酶采用了一种独特的催化机制,涉及到乌比奎本身.
- 阐明酶在调节NF-κB信号传递中的作用.
结论:
- 这种新发现的酶对于控制线性ubiquitin链周转是必不可少的.
- 酶的自我催化机制为二维基因化酶的功能提供了新的见解.
- 这一发现推动了我们对泛素信号传递和NF-κB通路调节的理解.
相关概念视频
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...
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...
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.
Protein Complexes with Interchangeable Parts
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 to...
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 to...

