aGPCR-HEK:一种稳定的高表达可诱导的哺乳动物细胞表达系统用于粘附GPCR结构生物学应用
David M Favara1,2,3, Christopher G Tate1
1Division of Structural Studies, MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge, UK.
Bio-protocol
|March 12, 2026
概括
研究人员开发了aGPCR-HEK,这是一种新的方法,用于在哺乳动物细胞中产生正确折叠的粘附G蛋白结合受体 (aGPCR). 这个系统可以在毫克尺度上净化aGPCRs,用于诸如冷电子显微镜 (cryo-EM) 等结构研究.
科学领域:
- 结构生物学 结构生物学
- 生物化学 生物化学
- 细胞生物学 细胞生物学
背景情况:
- 粘附G蛋白结合受体 (aGPCRs),包括ADGRL4,与各种癌症有关.
- 传统的昆虫细胞表达系统往往无法产生足够的正确折叠的aGPCRs用于结构分析.
- 低温电子显微镜 (cryo-EM) 需要高纯度,折叠良好的蛋白质样本.
研究的目的:
- 建立一个强大的基于哺乳动物细胞的表达系统,以产生毫克数量的正确折叠的aGPCRs.
- 允许对aGPCR进行结构和生化研究,特别是ADGRL4.
- 克服aGPCRs现有的表达系统的局限性.
主要方法:
- 开发一个稳定的,四环素诱导的HEK293S GnTI-TetR细胞系.
- 对于高效的aGPCR基因集成而进行的lentiviral转导.
- 流细胞计丰富具有泄漏GFP表达的细胞以增强诱导性.
- 适应悬浮培养,用于大规模蛋白质生产.
- 下游净化和冷EM分析.
主要成果:
- aGPCR-HEK系统可重复地产生毫克级数量的折叠的aGPCR.
- 该协议促进了结构生物学级蛋白质的生产.
- 成功产生了适合净化的N端HA和GFP标记的aGPCRs.
结论:
- aGPCR-HEK系统提供了一种可靠的方法来表达和净化aGPCRs用于结构和生化研究.
- 这种哺乳动物表达系统克服了以前在获得足够的折叠aGPCR蛋白质方面面临的挑战.
- 该协议可以适应附着细胞和悬浮细胞培养,从而提高了其多功能性.
相关概念视频
G 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...
GPCRs Regulate Adenylyl Cylase Activity
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
Two...
Transducer Mechanism: G Protein–Coupled Receptors
G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical, 7TM, or...
GPCRs are also called heptahelical, 7TM, or...


