原生展开的FG重复稳定了核孔综合体的结构
Evgeny Onischenko1, Jeffrey H Tang1, Kasper R Andersen2
1Department of Biology, Institute of Biochemistry, Eidgenössische Technische Hochschule Zürich, Otto-Stern-Weg 3, CH-8093 Zurich, Switzerland.
Cell
|October 17, 2017
概括
酵母核孔综合体 (NPC) 中的氨酸-甘氨酸 (FG) 反复不仅仅是调节运输;它们还结合了支架核波林 (Nups) 并帮助NPC组装. 这揭示了FG重复在NPC架构中的新结构作用.
科学领域:
- 细胞生物学
- 分子生物学
- 结构生物学
背景情况:
- 核孔复合体 (NPC) 是大型蛋白质通道,控制细胞核和细胞质之间的分子流动.
- 许多核素 (Nups) 具有富含氨酸 (FG) 的重复,形成核运输的选择性屏障.
- 除了运输规则之外,FG重复的精确结构和组装作用尚未完全理解.
研究的目的:
- 研究酵母NPC结构和生物发生中的FG重复的其他功能.
- 探索含有GLFG的FG重复与脚手架Nups的相互作用.
- 阐明FG重复在NPC组装中的作用.
主要方法:
- 在体外结合测试以测试GLFG重复和支架Nups之间的相互作用.
- 在体内研究以评估FG重复作为NPC向决定因素的作用.
- 分析NPC组装步骤,重点是Nup116和Nup188的功能.
主要成果:
- 在实验室中发现含有GLFG的FG重复直接结合多个支架Nups.
- 这些FG重复在体内作为NPC向的决定因素.
- Nup116的GLFG重复显示与Nup188的功能冗余,稳定NPC支架相互作用对于后期组装至关重要.
结论:
- 在连接NPC分组中,FG重复具有意想不到的结构作用,就像"Velcro"一样.
- 这一发现为NPC架构和生物生成的现有模型添加了新的层次.
- 这些发现突显了FG重复在维持核运输和NPC完整性方面的多方面的作用.
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