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全身人体接触器的冷EM结构in-2

Zhenzhen Zhang^1,2, Wei Chen³, Zhubing Shi^4,5

¹Cancer Immunology Center, Institute of Biomedicine and Biotechnology, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, China.

The FEBS journal

|December 20, 2024

概括

全长接触素-2 (CNTN2) 形成一个度依赖的同位素. 这种涉及Ig1-6域的新型螺结构对CNTN2至关重要.

科学领域:

神经科学是一个神经科学.
结构生物学结构生物学
细胞生物学细胞生物学

背景情况:

接触素-2 (CNTN2),一种免疫球蛋白细胞粘附分子 (IgCAM),在神经发育中起着至关重要的作用,包括髓化,神经通信和细胞迁移.
正确的组装和结构机制是全长CNTN2功能的基础,特别是它在细胞粘附中的作用,仍然不完全理解.

研究的目的:

阐明人体全长CNTN2组件的结构基础及其在细胞粘附中的作用.
调查CNTN2同质化和特定域相互作用的功能意义.

主要方法:

确定了全长人体CNTN2.2的冷电子显微镜 (cryo-EM) 结构.
利用结构引导的突变发生分析来评估同位体化和特定域在细胞粘附中的作用.
在试管体内研究了度依赖的同极聚合物形成.

主要成果:

全身长的人类CNTN2形成一个度依赖的同位素.
冷-EM结构揭示了一个由两个原质体的Ig1-6重复形成的新的弓状脚手架,外延伸的FNIII重复.
Ig1-6 域,以前未被识别的 Ig1-4 域,对于 CNTN2 介导的细胞粘附和聚类至关重要,同位化对此功能至关重要.

结论:

对于 CNTN2 在神经系统内细胞粘附中的作用来说,Ig1-6 域和同质化是必不可少的.
这项研究提供了新的结构洞察力,了解CNTN2是如何形成同位素来建立和维持神经细胞-细胞接触的.

关键词:

细胞粘附细胞粘附联系在-2-2中化-EMEM可以使用.分化二元化是指二元化的完整长度的全长电影.

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