在USP deubiquitinase催化机制中的多样性
Niels Keijzer1, Anu Priyanka1, Yvette Stijf-Bultsma1
1Division of Biochemistry and Oncode Institute, Netherlands Cancer Institute, Amsterdam, Netherlands.
Life science alliance
|February 14, 2024
概括
无处不在特异蛋白酶 (USP) 家族具有多样化的催化机制,其中一些依赖于关键残留物,而另一些则依赖于相邻的残留物. 这一发现为开发有针对性的USP疗法提供了新的途径.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 酶学 是一种酶学.
背景情况:
- 杜比基因酶 (DUBs) 的全域基因特异蛋白酶 (USP) 家族调节关键的细胞信号通路.
- 对USP活性位点的理解在很大程度上基于USP7,其中包括一种催化三合和一种保存的阿斯巴酸盐.
- 针对USP DUBs提供了治疗机会,临床开发中的抑制剂.
研究的目的:
- 量化研究两个关键残留物在五种不同的USP酶的活性位点中的作用.
- 确定USP7中观察到的催化机制是否在其他USP家族成员中保持.
主要方法:
- 局部定向突变发生,以改变五种USP酶中的关键残留物.
- 酶分析测量催化活性和核友性攻击效率.
- 基于细胞的测试以验证USP1在细胞环境中的催化机制.
主要成果:
- USP7需要特定的第三关键残留物进行催化,而USP1,USP15,USP40和USP48是独立的.
- 第四个关键残留物 (酸盐) 在USP1,USP15,USP40和USP48中对催化是必不可少的,但不是USP7.
- 这些残留物对核友性攻击的相对重要性在研究的USP之间有所不同.
- 证实USP1和USP7之间的不同催化机制是基质独立的,并保留在USP1.1.的细胞环境中.
结论:
- 该USP家族在催化机制中表现出意想不到的多样性,挑战了仅从USP7.7衍生出来的模型.
- 这些独特的催化策略在细胞系统中得到了保存和功能.
- 了解这种机制变异性为开发用于治疗干预的高度选择性的USP抑制剂开辟了新的可能性.
更多相关视频
10:25Screening Traditional Chinese Medicine Compounds for Inhibiting UCHL3 Activity Based on Molecular Docking and Deubiquitinating Enzyme Probe Technology
Published on: November 22, 2024
268
09:45Method for Measuring the Activity of Deubiquitinating Enzymes in Cell Lines and Tissue Samples
Published on: May 10, 2015
9.7K
相关概念视频
The Proteasome Structure
752
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...
752
The Proteasome
835
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...
835
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
Regulated Protein Degradation
7.3K
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...
7.3K
Protein Complexes with Interchangeable Parts
2.5K
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...
2.5K
Allosteric Proteins-ATCase
5.7K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
5.7K
