一种快速,无标签的方法来净化功能GPCRs
Anthony D Shumate1, David L Farrens1
1Department of Chemical Biology and Physiology, Oregon Health and Science University, Portland, Oregon, USA.
The Journal of biological chemistry
|December 14, 2023
概括
研究人员开发了一种无标签的方法来净化G蛋白结合受体 (GPCRs). 该技术使用Gα-CT来选择性地分离活性GPCRs,从而使结构生物学和蛋白质组学领域的新研究成为可能.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 药理学 药理学是指药理学的学科.
背景情况:
- G蛋白结合受体 (GPCR) 是关键的信号蛋白和重要的药物标.
- 众所周知,GPCRs在细胞环境之外是不稳定的,这使净化和分析变得复杂.
- 现有的GPCR净化方法往往有限或缺乏普遍性.
研究的目的:
- 开发一种通用,快速和无标签的方法来净化功能G蛋白结合受体 (GPCRs).
- 为了使GPCRs在特定的活性或非活性构造中分离出来,以便进一步研究.
- 为结构生物学,蛋白质组学和药物发现提供多功能工具.
主要方法:
- 在染色学珠子 (Gα-CT树脂) 上固定的Gα亚单元C端 (Gα-CT) 的短类型被利用.
- 利用Gα-CT和活性GPCR之间的高亲和相互作用进行选择性捕获.
- 操纵的化条件以分离GPCRs,无论是活性或非活性构造.
主要成果:
- 使用Gα-CT树脂成功净化了罗多和β2-上腺素受体.
- 证明了在不同的活性和非活性构造状态中隔离受体的能力.
- 验证了净化过程的无标签性质和速度.
结论:
- Gα-CT树脂提供了一种通用,无标签的方法来净化活性GPCRs.
- 这种方法促进了功能性受体在特定形状的隔离.
- 该方法具有很大的潜力,可以促进结构生物学,蛋白质组学和涉及GPCRs的制药研究.
相关概念视频
01:21G-protein Coupled Receptors
G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
01:15G Protein-coupled Receptors
G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
01:12GPCR Desensitization
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
01:24Tagging and Fusion Proteins
Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...