通过分子密度调节的结合点成熟 基础 Ndc80 结合到动态核受体 CENP-T
Ekaterina V Tarasovetc1, Gunter B Sissoko2,3, Aleksandr Maiorov1
1Department of Physiology, Perelman School of Medicine, University of Pennsylvania; Philadelphia, PA 19104, USA.
bioRxiv : the preprint server for biology
|March 11, 2024
概括
分子拥挤加速结合点的成熟,增强宏分子组装. 这种在kinetochore蛋白CENP-T中观察到的机制促进了对细胞结构的高效Ndc80复合体的招募.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 细胞生物学 细胞生物学
背景情况:
- 大分子组装需要精确控制蛋白质-蛋白质相互作用,有利于在特定位置结合,而不是溶解相.
- 动态架蛋白CENP-T表现出密度增强的结合,在聚类时招募更多的Ndc80复合体,但机制尚不清楚.
研究的目的:
- 为了阐明密度增强的NDC80复合体与集群CENP-T结合背后的分子机制.
- 调查结合点成熟和环境敏感性在调节动态组装中的作用.
主要方法:
- 用量化体外结合试验来研究Ndc80-CENP-T相互作用的动力学.
- 分析重点是两步结合过程,包括地点成熟和分子环境的影响.
主要成果:
- Ndc80与CENP-T结合是一个两步过程,涉及最初的快速结合/解离,随后是较慢的位点成熟和更强的保留.
- 结合点成熟在聚类CENP-T中是由于环境敏感性而加速的,这是由动力屏障调节的过程.
- 对于人类CENP-T中的两个Ndc80结合点,观察到不同的成熟率和环境敏感性.
结论:
- 聚类诱导的结合点成熟的加速是驱动密度增强的Ndc80与CENP-T结合的关键机制.
- 这一过程可以在人类细胞分裂中观察到,这表明它在动态细胞组合中起着调节作用.
- 通过分子拥挤来调节结合点成熟的加速可能是促进宏分子结构形成的一般原则.
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