相关实验视频
Updated: Jun 6, 2025

06:06
In Vitro Analysis of E3 Ubiquitin Ligase Function
Published on: May 14, 2021
5.1K
蛋白质结合在一个分离的细菌无化途径的机制基础
Qiaozhen Ye1, Minheng Gong1, Lydia R Chambers2
1Department of Cellular and Molecular Medicine, University of California San Diego, La Jolla CA 92093.
bioRxiv : the preprint server for biology
|November 28, 2024
概括
研究人员发现了细菌的泛化样 (Bub) 路径,这些路径使用氧中间体而不是酸中间体. 这些途径与真核生物的无化不同,可能在细菌抗菌体免疫力中发挥作用.
科学领域:
- 分子生物学分子生物学
- 生物化学 生化学
- 微生物学 微生物学
背景情况:
- 乌比基因化是一种关键的真核蛋白质翻译后修饰,涉及通过E1,E2和E3酶将乌比基因结合到目标蛋白质.
- 细菌蛋白质结合路径,包括那些参与抗菌体免疫的路径,与真核生物的无处不在结合有相似之处.
- 生物信息学分析表明,未被发现的细菌通路利用了类似于无处不在的机械.
研究的目的:
- 阐明新发现的细菌无处不在类似 (Bub) 路径的结构和生化机制.
- 为了比较Bub路径与真核生物的无处不在,专注于机理上的差异和相似之处.
- 研究Bub通路的功能作用,特别是在细菌防御的背景下.
主要方法:
- 布布操作子组件的表征,包括E1,E2和泛素类 (Ubl) 蛋白质.
- 生物化学测试以确定蛋白质结合过程中中间体的性质 (氧与硫).
- 在Bub操作中识别和分析新型蛋白酶家族.
- 基因组上下文分析以推断功能角色,例如抗菌素免疫力.
主要成果:
- 泡泡路径编码功能性E1,E2和UBL蛋白质,同类于真核生物对应物.
- 在Bub路径中,蛋白质结合通过氧中间体进行,这与真核生物的无化中基中间体有显著的不同.
- 在Bub操作体内发现了一种具有保存的催化二的新型血清蛋白酶家族.
- 基因组组织表明,Bub途径与细菌抗菌体防御机制有关.
结论:
- 泡通路代表了一种具有独特生化机制的细菌无处不在相关系统的新类.
- 对氧中间体的依赖区分了Bub途径与真核生物的无处不在.
- 这些发现扩大了我们对细菌蛋白结合和防御策略的理解,特别是抗菌体免疫力.
相关概念视频
Regulated Protein Degradation
7.1K
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...
7.1K
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
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
The Proteasome
814
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...
814
Bacterial Translocation and Protein Secretion
2
Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
2
The Proteasome Structure
699
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...
699

