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关于LGR4,R-spondin和ZNRF3对Wnt/β-catenin信号调节的结构性见解
Yuxuan Peng1, Akiko Fujimura1, Jinta Asami1
1Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan.
Nature communications
|October 1, 2025
概括
结构洞察力揭示了蛋白丰富的重复含有G蛋白结合受体4 (LGR4) 和R-蛋白2 (RSPO2) 复合体与和环指3 (ZNRF3) 如何调节Wnt/β-catenin信号传递,这对发育和癌症至关重要.
科学领域:
- 结构生物学 结构生物学
- 分子生物学分子生物学
- 细胞信号传递 细胞信号传递
背景情况:
- 富含白的重复含有G蛋白结合受体4 (LGR4) 对于Wnt/β-catenin信号传递,器官发育和致癌至关重要.
- LGR4及其连接物R-spondin (RSPO) 通过招募和清除抑制剂和环指3 (ZNRF3) 来增强Wnt信号.
- LGR4-RSPO-ZNRF3相互作用的精确机制在很大程度上仍未得到阐明.
研究的目的:
- 为了确定LGR4-RSPO2-ZNRF3复合体形成的结构基础.
- 阐明LGR4和RSPO2增强Wnt/β-catenin信号传递的机制.
- 为针对LGR4-RSPO2-ZNRF3途径的治疗策略提供基础.
主要方法:
- 使用冷电子显微镜 (cryo-EM) 解析了人类LGR4,LGR4-RSPO2和LGR4-RSPO2-ZNRF3复合物的结构.
- 在RSPO2结合时LGR4的构造变化的分析.
- 三元复合体的固体测量和架构的表征.
主要成果:
- 在RSPO2结合时,LGR4在其细胞外和膜外域中表现出最小的构造变化.
- LGR4,RSPO2和ZNRF3蛋白质组装成精确的2:2:2静态度,形成一个中央的ZNRF3二次体.
- 这种特定的三元复合体形成解释了LGR4和RSPO2如何通过隔离和禁用ZNRF3.3来增强Wnt信号传输.
结论:
- 这项研究提供了LGR4-RSPO2-ZNRF3复合体的第一个结构证据,揭示了独特的 2:2:2架构.
- 这种结构理解阐明了通过LGR4和RSPO2.2通过Wnt/β-catenin信号增强的机制.
- 这些发现为开发针对癌症和与这种途径相关的发育障碍的新疗法提供了潜在的途径.
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