相关实验视频
Updated: May 4, 2026

09:20
CRISPR-Mediated Reorganization of Chromatin Loop Structure
Published on: September 14, 2018
14.2K
在CRL4DDB2/CSA的分子基础上,ubiquitin合酶的架构,向和激活
Eric S Fischer1, Andrea Scrima, Kerstin Böhm
1Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland.
Cell
|November 29, 2011
概括
CRL4 (((DDB2) 酶通过DDB2识别UV损伤的DNA,但被COP9信号体 (CSN) 抑制. 对DDB2的DNA结合释放了这种抑制,揭示了CRL4酶激活的一般机制.
科学领域:
- 分子生物学分子生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 在DDB1-CUL4-RBX1 (CRL4) 泛基因酶家族通过专用基质受体 (DCAFs) 控制细胞功能.
- DDB2 DCAF蛋白特别识别紫外线诱导的胺二聚体,这对DNA修复至关重要.
- 了解CRL4 (DDB2) 调节是细胞对DNA损伤反应的关键.
研究的目的:
- 为了阐明DDB2介导的分子机制,在染色体中识别循环丁胺二元体.
- 通过COP9信号体 (CSN) 确定CRL4(DDB2) 酶调节的结构基础.
- 提出CRL4酶激活的一般模型.
主要方法:
- CRL4 ((DDB2) 和CRL4 ((DCAF ((WD40)) 复合物的X射线晶体学.
- 酶抑制剂相互作用的结构分析.
- 生物化学测定用于研究酶活性和调节.
主要成果:
- CRL4的结构 (DDB2) 显示出一个移动的结合酶臂,在DNA损伤周围创建一个特定的无处不在区域.
- COP9信号体 (CSN) 在CSN5独立的方式中非酶性抑制CRL4 ((DDB2).
- 与DDB2结合的DNA损伤缓解了CSN介导的抑制,激活了结合酶.
- CRL4 ((DCAF ((WD40)) 综合体共享保存的建筑特征.
结论:
- CRL4 (((DDB2) 激活并非由DNA损伤直接介导,而是通过CSN位移.
- 基质与DCAF结合是CSN位移和CRL4联酶激活的一般触发因素.
- 这项工作为了解CRL4酶家族成员的调节提供了一个框架.
相关概念视频
Protein Complex Assembly
12.5K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
12.5K
Covalently Linked Protein Regulators
8.2K
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....
8.2K
Protein Complexes with Interchangeable Parts
2.1K
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...
2.1K
Regulated Protein Degradation
6.6K
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...
6.6K
Anaphase Promoting Complex
2.5K
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...
2.5K
Assembly of Signaling Complexes
4.7K
Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
4.7K

