通过CXCR3对小分子识别的结构可视化,揭示了CXCR3-CXCR7系统中的双重激动性
Shirsha Saha1, Fumiya K Sano2, Saloni Sharma1
1Department of Biological Sciences and Bioengineering, Indian Institute of Technology Kanpur, Kanpur, India.
Nature communications
|March 29, 2025
概括
结构洞察力揭示了化学因受体CXCR3和CXCR7如何实现信号偏差和双重激动. 对G蛋白结合受体 (GPCR) 机制的这种理解提供了潜在的治疗策略.
科学领域:
- 结构生物学是结构生物学.
- 分子药理学分子药理学
- 免疫学 免疫学 免疫学
背景情况:
- 化基因受体,主要是G蛋白合受体 (GPCRs),调节免疫反应.
- 一些GPCRs,如CXCR3和CXCR7,表现出对β-arrestins (βarrs) 的信号偏差.
- CXCR3和CXCR7共享一种激动剂 (CXCL11) 并结合小分子激动剂,表明灵活的结合口袋.
研究的目的:
- 为了确定CXCR3.3的冷电子显微镜 (冷EM) 结构.
- 阐明CXCR3-CXCR7系统中信号偏差和双重激动的基础分子机制.
- 确定具有CXCR3偏向激进分子和CXCR7潜在双重激进分子的小分子.
主要方法:
- 电子显微镜 (cryo-EM) 用于结构性确定CXCR3.
- 对CXCR3在Apo状态和与G蛋白或β-arrestin偏向小分子激动剂复合的分析.
- 在CXCR7.7中验证小分子激动剂活性.
主要成果:
- 低温-EM结构揭示了CXCR3中的一个全网络,该网络决定了传感器合偏差.
- 这个网络连接了连接器结合口袋到细胞内信号接口.
- 选择的CXCR3激动因子在CXCR7表现出强烈的激动因子,突出显示了双重激动因子潜力.
结论:
- 对信号偏差和CXCR3和CXCR7的双重激动的结构基础的分子洞察力.
- 这些发现为设计调节化学因受体信号的向疗法提供了基础.
- 了解这些GPCR机制对免疫反应调节和疾病治疗有重大影响.
更多相关视频
14:02Optimizing the Genetic Incorporation of Chemical Probes into GPCRs for Photo-crosslinking Mapping and Bioorthogonal Chemistry in Live Mammalian Cells
Published on: April 9, 2018
06:56A Flow Cytometry-based Assay to Identify Compounds That Disrupt Binding of Fluorescently-labeled CXC Chemokine Ligand 12 to CXC Chemokine Receptor 4
Published on: March 10, 2018
相关概念视频
Chemotaxis and Direction of Cell Migration
Cells can detect chemical cues in their environment and reorganize the cytoskeleton to migrate toward them or away from them. This directional migration, called chemotaxis, is essential during embryogenesis and development, immune response, tissue repair and regeneration, and reproduction. These chemical cues can either attract or repel the cell's movement. For example, axon development is determined by a combination of chemoattractants and chemorepellents that direct the growing axon towards...
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...
The Two-State Receptor Model
The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
The binding affinity of a drug determines its interaction with one...
The binding affinity of a drug determines its interaction with one...
