HURP和Kif18A在线粒体调节中的分子相互作用
Juan M Perez-Bertoldi1, Yuanchang Zhao2, Akanksha Thawani3
1Biophysics Graduate Group, University of California, Berkeley, CA, USA.
Research square
|June 10, 2024
概括
肝瘤上调蛋白 (HURP) 调节了Kif18A运动蛋白在微管上的活性. 这种相互作用对于控制细胞分裂期间的微管子动态至关重要,确保适当的染色体分离.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物物理学的生物物理.
背景情况:
- 微管的动力学对于线粒分裂期间的染色体分离至关重要.
- 肝瘤上调蛋白 (HURP) 和Kif18A是动态管附着微管动态的关键调节者.
- 对于HURP和Kif18A相互作用的确切机制尚不清楚.
研究的目的:
- 阐明HURP调节Kif18A运动的机制.
- 为了确定HURP与微管结合的结构基础.
- 了解HURP和Kif18A在线程长度控制中的联合作用.
主要方法:
- 在体外单分子成像 in vitro.
- 电子显微镜 (Cryo-EM) 用于确定蛋白质结构.
- 生物化学测试用于分析运动蛋白活性.
主要成果:
- HURP对Kif18A机动性的影响依赖于度:稀疏的HURP会激活,而高度会抑制Kif18A.
- 冷-EM揭示了HURP在微管上独特的结合模式,横向跨越和原纤维之间.
- HURP结合部分与Kif18A运动域结合部位重叠,表明存在固体阻碍.
- HURP和Kif18A合作抑制微管 plus-end 动力学.
结论:
- HURP通过激活和通过硬质阻碍抑制来调节Kif18A的运动性.
- 确定的结构为HURP.18A对Kif18A调节的机制性解释.
- 在一起,HURP和Kif18A在控制线粒分裂期间的轴长度方面发挥着协调作用.
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