在50S核糖体子单元组装过程中,YsxC是核糖体蛋白LU2的替代体
Amal Seffouh1,2, Dominic Arpin1,2, Kaustuv Basu1,2
1Department of Anatomy and Cell Biology, McGill University, 3640 Rue University, Montreal, Quebec H3A 0C7, Canada.
Nucleic acids research
|October 28, 2025
概括
细菌50S核糖体组装涉及了新的GTPase YsxC. YsxC作为核糖体蛋白L2的替代体,促进其结合和随后的rRNA折叠以形成成熟的50S亚单元.
科学领域:
- 分子生物学分子生物学
- 核糖体生物发生.
- 细菌蛋白质合成 细菌蛋白质合成
背景情况:
- 核糖体组装对于蛋白质合成至关重要.
- 像RbgA和YphC这样的组装因子有助于Bacillus subtilis中的50S亚单元成熟.
- 在50S子单元组合中GTPase YsxC的功能以前是未知的.
研究的目的:
- 为了阐明GTPase YsxC在Bacillus subtilis 50S核糖体子单元组合中的未知的功能.
- 调查YsxC为50S子单位的成熟作出贡献的机制.
主要方法:
- 对核糖体组装中间体的生物化学分析.
- 对YsxC结合部位和44.5S组装中间体内的相互作用的表征.
- 研究 YsxC 在rRNA螺旋折叠和蛋白质结合的时间调节中的作用.
主要成果:
- YsxC与44.5S大型核糖体组装中间体结合,占据核糖体蛋白L2的结合部位.
- YsxC建立了LU2的"原始"结合点,其中包括11个rRNA螺旋中的6个.
- YsxC的释放允许LU2结合,并随后折叠剩余的rRNA螺旋,导致成熟的50S形状.
结论:
- 在细菌中的50S子单元组装过程中,YsxC作为核糖体蛋白LU2的新型取位因子起作用.
- 这代表了第一个发现的替代因子,促进细菌中的核糖体组装的例子.
- YsxC的机制突出了一个独特的策略来控制rRNA折叠和蛋白质结合的时间.
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