丁氨酸微管结合域的结构和功能作用
Andrew P Carter1, Joan E Garbarino, Elizabeth M Wilson-Kubalek
1Howard Hughes Medical Institute and Department of Cellular and Molecular Pharmacology, University of California, San Francisco, CA 94158, USA.
概括
在Dynein发动机中.
科学领域:
- 分子运动功能的分子运动功能.
- 细胞骨动力学 细胞骨动力学
- 细胞运输机制的细胞运输机制.
背景情况:
- 迪尼因电机对于细胞内运输和细胞运动性至关重要.
- 迪内因的一个关键特征是,其微管结合域 (MTBD) 与其AAA+ ATPase域的分离由一个卷轴的卷轴茎.
- 了解这些领域之间的结构和功能关系对于阐明dynein的作用机制至关重要.
研究的目的:
- 为了确定小鼠细胞质二烯微管结合域 (MTBD) 和相关的卷轴-卷轴区域的晶体结构.
- 调查MTBD与AAA+ ATPase域之间的通信的结构基础.
- 为了确定dynein定向运动性的主要决定因素.
主要方法:
- 使用X射线晶体学来确定dynein MTBD的结构和卷曲线的一部分.
- 结构分析的重点是卷轴杆及其在域间通信中的潜在作用.
- 进行了功能性测试,以评估MTBD和ATPase域在确定运动方向方面的作用.
主要成果:
- 晶体结构揭示了dynein MTBD和卷轴-卷轴茎的原子细节.
- 作为ATPase和MTBD之间的通信机制,建议在卷轴卷轴的heptad注册表中进行转移.
- 功能数据表明,MTBD,而不是ATPase域,是dynein方向运动的主要决定因素.
结论:
- 该结构提供了关于dynein的ATPase域和MTBD如何通信的见解.
- 奇怪的是,MTBD在决定dynein驱动运动的方向方面发挥了占主导地位的作用.
- 这一发现挑战了关于dynein方向运动的主要驱动因素的先前假设.
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