使用稳定同位素标记和质谱法对rRNA修饰的定量分析
Anna M Popova1, James R Williamson
1Department of Integrative Structural and Computational Biology and ‡Department of Chemistry, The Scripps Research Institute , La Jolla, California 92037, United States.
Journal of the American Chemical Society
|January 16, 2014
概括
研究人员开发了一种新的LC-MS方法来量化核糖体RNA (rRNA) 在核糖体生物发生过程中的修饰. 这种技术揭示了新生rRNA中的亚基基度修饰水平,与埃舍里希亚大肠杆菌核糖体组装期间的蛋白质关联相关.
科学领域:
- 分子生物学分子生物学
- 生物化学 生物化学
- 微生物学 微生物学
背景情况:
- 核糖体生物发生包括对蛋白质合成至关重要的复杂的转录后RNA修饰.
- 目前用于量化这些修饰的方法是有限的,阻碍了对细胞生物发生过程中它们的协调的理解.
研究的目的:
- 开发和验证一种全面的定量方法来分析核糖体RNA (rRNA) 修饰.
- 在大肠杆菌中的核糖体生物发生过程中调查rRNA修饰的固体测量和时间.
主要方法:
- 开发一种液体染色学-质谱学 (LC-MS) 方法,用于定量rRNA修饰分析.
- 实施同位素标记以识别甲基化和代谢标记以检测伪尿素.
- 与成熟的 (15) N 标记的 rRNA 标准相比,在前核糖体颗粒中的修饰水平的比较.
主要成果:
- 成功量化了来自大肠杆菌的16S和23SrRNA中的36个修饰残留物中的29个.
- 在不完整的核糖体子单元中发现了几种修饰的已识别的亚核糖体量.
- 观察到RNA修饰水平和核糖体蛋白关联概况之间的相关性.
结论:
- 开发的LC-MS工作流可以有效地对核糖体修饰进行全球监测.
- 在生物发生过程中,RNA修饰的时间似乎与核糖体蛋白协会协调.
- 这项研究促进了对RNA修饰机制及其对细胞过程的影响的理解.
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