从Skp1-Skp2复合体的结构中了解SCF泛素酶
B A Schulman1, A C Carrano, P D Jeffrey
1Cellular Biochemistry and Biophysics Program, Medical Institute, Memorial Sloan-Kettering Cancer Center, New York, New York 10021, USA.
Nature
|December 1, 2000
概括
F盒蛋白是细胞循环和免疫调节的关键. 这项研究揭示了Skp2与Skp1结合的晶体结构,揭示了Skp1如何招募F盒蛋白进行无处不在.
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:
- F-box 蛋白质是 SCF 泛基因蛋白质链酶的关键组成部分,通过向蛋白质降解来调节各种细胞过程.
- 由Skp1,Cullin和F盒蛋白组成的SCF复合体,在细胞循环控制,免疫反应和信号传导中发挥着至关重要的作用.
- 尽管存在大量的F-box蛋白和Skp1同类蛋白,但它们的特定识别机制和功能作用在很大程度上是未知的.
研究的目的:
- 阐明F-盒蛋白Skp2及其适配蛋白Skp1之间的相互作用的结构基础.
- 了解SCF泛素酶对基质的识别和招募背后的分子机制.
主要方法:
- 采用X射线晶体学,确定了人类Skp2-Skp1复合体的高分辨率结构.
- 结构分析的重点是确定参与Skp1-F盒蛋白相互作用的接口.
主要成果:
- 晶体结构显示,Skp1通过双重接口招募F-box蛋白Skp2,同时参与F-box动机和基质识别域.
- 这种相互作用机制表明了潜在的特异性,不同的Skp1家族成员可能与不同的F-box蛋白的不同子集结合.
- 结构数据表明,F-box蛋白可能不仅可以招募基质,还可以将它们最佳定位为无处不在.
结论:
- 在Skp2-Skp1结构提供了关键的见解,在SCF的ubiquitin结合酶复合体的组装和特异性.
- 这些发现表明,Skp1蛋白质的变异有助于F-box蛋白质介导的无处不在的功能多样化.
- 这种结构性理解为探索健康和疾病中蛋白质降解途径的调节开辟了道路.
相关概念视频
02:41Protein Complex Assembly
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.
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02:04Covalently 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.
01:57Protein 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...
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02:58Regulated 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...
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00:50Anaphase Promoting Complex
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...
01:30Assembly of Signaling Complexes
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
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Interaction domains in cell signaling
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