乌比基因特异性蛋白酶11结构与工程基质模拟物复合,揭示了对杜比基因化选择性的分子特征
Sigrun K Maurer1, Matthias P Mayer1, Stephanie J Ward1
1Biodiscovery Institute, School of Pharmacy, University of Nottingham, Nottingham, United Kingdom.
The Journal of biological chemistry
|September 30, 2023
概括
研究人员阐明了由乌比基因特异蛋白酶 (USP) 进行的二维基因化选择性的分子基础,确定了USP11中的关键残留物,这些残留物歧视特定的乌比基因链,推动了抑制剂的开发.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 结构生物学 结构生物学
背景情况:
- 乌比基特异性蛋白酶 (USP) 调节细胞蛋白质稳定和信号传递,但它们的选择性,特别是对应物之间的选择性,尚不清楚.
- 了解USP选择性对于破译细胞过程和开发向疗法至关重要.
研究的目的:
- 研究USP11基质选择性的基础分子机制,USP11是DNA修复的关键调节器.
- 确定USP11在不同类型的二维基因链之间进行歧视的结构基础.
- 探索开发向USP抑制剂的潜力.
主要方法:
- 开发了一种与蛋白质数据库挖掘相结合的新型融合标签方法.
- 确定了USP11的晶体结构,该晶体结构处于一个类似迈凯利斯的复合体中,其基板模仿工程.
- 进行突变,酶和结合测定,以确定涉及基质歧视的关键残留物和相互作用.
主要成果:
- 通过USP11.11在线性duibiquitin中确定Met77作为基质歧视的关键残留物.
- 在USP11 S1"地点发现了阿斯巴酸盐"守门人"残留物,这有助于对线性duibiquitin进行歧视.
- 证明在USP11中突变这一守门者残留物以模仿USP15,改变了基质特异性,证实了对应物特异性差异.
结论:
- 这项研究揭示了USP11与其对应物USP15.5相比具有更高选择性的分子基础.
- 在USP11活性部位的关键残留物决定了基质的歧视,特别是在线性二维基因中.
- 这些发现可能会促进针对USP的向抑制剂的开发,并为其他具有挑战性的蛋白质标提供结晶策略.
关键词:
晶体结构 晶体结构囊蛋白酶酶的作用是什么没有二维基丁酶.脱维基化 (deubiquitination) 是一个过程.融合标签 融合标签 融合标签蛋白质酶蛋白质酶是一种蛋白质.选择性的选择性在任何地方都是无处不在的.基特异性蛋白质酶的使用.更多相关视频
相关概念视频
The Proteasome Structure
788
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...
788
Protein Complexes with Interchangeable Parts
2.6K
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...
2.6K
The Proteasome
873
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...
873
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
7.4K
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...
7.4K


