AAA + ATPase 索拉酶的冷-EM 结构揭示了新的螺旋丝形成
Mohamad Aasif Dar1,2, Robert Louder3, Marisol Cortes1,2
1Neuroregeneration and Stem Cell Programs, Institute for Cell Engineering, The Johns Hopkins University School of Medicine, Baltimore, Maryland, United States of America.
bioRxiv : the preprint server for biology
|November 28, 2024
概括
索拉酶 (ATAD1) 形成了螺旋状纤维,对于其在细胞过程中的功能至关重要. 它的结构揭示了一个新的二维排列,这对于拆解像mtORC1.1.这样的蛋白质复合体至关重要.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
背景情况:
- 多酶 (ATAD1),一个AAA+ ATPase,对于突触可塑性,线粒体质量控制和mTOR信号传递至关重要.
- 它的功能涉及对ATP依赖的蛋白质复合物的分解,如AMPAR和mtORC1.1.
- 多拉酶的寡合化对于其蛋白质复合物的分解和重塑活动至关重要.
研究的目的:
- 为了研究多酶的寡合化和丝状形成.
- 通过使用冷电磁波来确定多拉酶丝的结构.
- 为了阐明mTORC1复合物的托拉酶介导分解的机制.
主要方法:
- 在体外聚合测定野生类型的Thorase.
- 低温电子显微镜 (cryo-EM) 用于确定导线结构.
- 结构引导的突变发生,以验证关键残留物.
主要成果:
- 野生类型的Thorase在体外形成长螺旋丝,依赖ATP结合而不是水解.
- 冷-EM结构揭示了导线中的新型二维布局,与以前已知的六维组件不同.
- 突变发生证实了特定残留物对于丝形成,寡合化和mTORC1复合体分解的重要性.
结论:
- 索拉酶形成了一种新的螺旋丝结构,对其生物功能至关重要.
- 灯丝内部的二维排列对于Thorase的作用机制至关重要.
- 这项研究提供了对Thorase线索形成及其在mTORC1复杂分解中的作用的关键见解.
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