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基因素-3 KIF1C经历液-液相分离,以在细胞外围积累特定的转录

Qi Geng¹, Jakia Jannat Keya², Takashi Hotta²

¹Department of Molecular, Cellular, and Developmental Biology, University of Michigan, Ann Arbor, MI, USA.

The EMBO journal

|June 19, 2024

概括

基因素电机KIF1C使用其内在无序区域 (IDR) 来驱动液体-液体相分离 (LLPS),形成凝结物,将mRNA结合并运送到特定的细胞位置.

科学领域:

细胞生物学细胞生物学
分子电机分子电机
运输运输 RNA 运输 RNA

背景情况:

细胞利用mRNA运输和亚细胞定位进行局部蛋白质生产.
基因素-3家族的运动蛋白KIF1C已被确定为RNA转运体.
KIF1C与RNA分子相互作用的机制尚不清楚.

研究的目的:

为了阐明KIF1C如何与RNA分子相互作用.
研究KIF1C的内在无序区域 (IDR) 在RNA结合和运输中的作用.
了解液-液相分离 (LLPS) 对KIF1C在mRNA定位中的作用的贡献.

主要方法:

对KIF1C的C端尾域对内在无序区域 (IDR) 的分析.
细胞成像观察KIF1C点的形成和RNA的结合.
采用纯化的KIF1C尾部结构和RNA分子进行体外相位分离试验.

主要成果:

KIF1C的C端尾部包含一个IDR,驱动液态液相分离 (LLPS).
在选择性地结合RNA的细胞中,KIF1C形成动态的液态凝聚物.
内源KIF1C凝聚物在细胞突起中发现,以依赖IDR的方式丰富mRNA.
纯化的KIF1C尾部结构在体外接受LLPS,并直接招募RNA.

结论:

KIF1C的LLPS活性与其在mRNA定位中的作用密切相关.
KIF1C尾部的LLPS活动代表了汽车货物相互作用的新机制.
这项研究扩大了对细胞骨运动蛋白如何与它们的载荷相互作用的理解.

关键词:

这是一个IDR IDR.这种类型的激素是kinesin.这就是LLPS.微管是微管中的一个.mRNA 运输 mRNA 运输

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