植物Augmin的冷-EM结构揭示了其交织的卷轴-卷轴组件,反平行二极化和NEDD1结合机制
Md Ashaduzzaman1, Aryan Taheri1,2, Yuh-Ru Julie Lee3
1Department of Molecular Cellular Biology, University of California, Davis, CA, USA.
bioRxiv : the preprint server for biology
|March 4, 2025
概括
奥格明和NEDD1蛋白对于微管 (MT) 分支核形成至关重要. 这项研究揭示了Augmin.
科学领域:
- 细胞生物学 细胞生物学
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- 微管 (MT) 分支核化对于构建真核细胞中平行MT网络至关重要.
- 在植物和甲基动物中,Augmin和NEDD1蛋白质对于MT分支核化是必需的,它们与MT结合,以招募和激活马-林环复合体 (γ-TuRC).
- 奥格明是一种由八个子单元组成的叉状复合体,NEDD1是一种WD40蛋白,可以跨越MTs,奥格明和γ-TuRC.
研究的目的:
- 为了重建和结构性地描述Arabidopsis thaliana的Augmin组件.
- 阐明植物Augmin.的子单元相互作用和整体组织.
- 调查Augmin和NEDD1之间的相互作用及其在MT核形成中的作用.
主要方法:
- 复制的异质四度和异质八度美洲的Arabidopsis thaliana奥格明组合.
- 交叉连接质谱法以解决子单元相互作用.
- 低温电子显微镜 (cryo-EM) 用于确定奥格明区域和复合物的结构.
主要成果:
- 一个完整的 de novo Augmin 植物模型被生成,揭示了稳定其 40 纳米的 hetero-octameric 结构的多线圈-线圈接口.
- 在Augmin V-junction处的双卡尔波宁同质 (CH) 域被发现采用开放和闭合的构造,作为MT结合点.
- 奥格明通过保存的表面进行反平行二元化,NEDD1与奥格明V连接处结合,增强二元化.
结论:
- 通过NEDD1增强的Augmin的V形结构和双CH域绑定,为γ-TuRC招募创造了一个平台.
- 这种机制将Augmins固定在MT格子上,从而促进了分支的MT核化.
- 这些发现提供了有关在工厂中MT组织的监管的见解.
关键词:
八月 八月 八月 八月在 Augmin Augmin 里面化电磁波是一种冷电磁波.房子房子房子房子在NEDD1中,它是NEDD1.分支核化核化的分支.玛-氨酸环复合体是玛-氨酸环复合体.微管是微管中的一个.更多相关视频
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