对CXCR4调制和寡合化的结构见解
Kei Saotome1, Luke L McGoldrick2, Jo-Hao Ho3
1Regeneron Pharmaceuticals, Inc., Tarrytown, NY, USA. kei.saotome@regeneron.com.
Nature structural & molecular biology
|September 23, 2024
概括
通过CXCL12激活化基因受体CXCR4的方法详细使用了冷EM. 结构显示了对手AMD3100和抗体REGN7663的结合,以及影响CXCR4寡合化的功能.
科学领域:
- 结构生物学 结构生物学
- 分子药理学分子药理学
- 细胞信号传输 细胞信号传输
背景情况:
- 化学因子受体CXCR4 (C-X-C化学因子受体类型4) 在各种细胞过程中发挥着关键作用.
- 之前的结构研究揭示了CXCR4的非活性,同位体形式,使得许多监管方面的理解不足.
研究的目的:
- 使用冷电子显微镜研究人类CXCR4调节的结构机制.
- 为了阐明配体CXCL12,对手AMD3100和抗体REGN7663.3的结合方式.
- 探索CXCR4寡合化的结构基础及其功能影响.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 来确定CXCR4.4的高分辨率结构.
- 对受体的连接体和寡合体状态的分析.
主要成果:
- 化学因子CXCL12 (C-X-C动机化学因子连接体12) 通过将其N端插入orthosteric口袋来激活CXCR4.
- 抗体AMD3100通过静电相互作用与受体的跨膜束内的酸性残留结合.
- 抗体REGN7663与细胞外面结合,并插入orthosteric口袋.
- 冷-EM揭示了CXCR4的三元和四元组合,显示出不同的亚单元构造.
结论:
- CXCR4的结构和功能是由联体结合,抗体和抗体调节的.
- 将CXCR4氧化成三聚体和四聚体形式影响受体构造和功能,这表明了全聚体调节.
- 这些发现为化学因受体结构生物学和潜在的治疗向提供了关键的见解.
更多相关视频
07:41A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
Published on: February 20, 2018
8.9K
08:55Characterization of Multi-subunit Protein Complexes of Human MxA Using Non-denaturing Polyacrylamide Gel-electrophoresis
Published on: October 28, 2016
10.2K
相关概念视频
Assembly of Signaling Complexes
5.7K
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,...
5.7K
Leaky Scanning
5.1K
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R...
5.1K
Cooperative Allosteric Transitions
7.9K
Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
7.9K
Receptor Downregulation in MVBs
2.0K
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR...
2.0K
Cell Polarization by Rho Proteins
2.7K
Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
2.7K
