通过带有附带子单元的核糖体进行蛋白质合成
Cédric Orelle1, Erik D Carlson2, Teresa Szal1
1Center for Pharmaceutical Biotechnology - m/c 870, University of Illinois at Chicago, 900 South Ashland Avenue, Chicago, Illinois 60607, USA.
Nature
|July 30, 2015
概括
科学家们设计了连接式核糖体 (Ribo-T) 在蛋白质合成中的功能. 这项创新使得正交基因系统的创建和新型核糖体功能的设计成为可能.
科学领域:
- 分子生物学
- 遗传学
- 生物化学
背景情况:
- 核糖体对于蛋白质合成至关重要,由两个独立的子单元 (小和大) 构建在核糖体RNA (rRNA) 支架上.
- 核糖体的双重性传统上被认为对生物发生和预防过早的翻译启动至关重要.
- 有限的子单位交换限制了专门的正交基因系统的发展.
研究的目的:
- 设计具有共价连接,不可分割的子单元 (Ribo-T) 的功能性核糖体.
- 建立第一个完全直角的核糖体传递 RNA 系统.
- 证明Ribo-T可用于新功能和遗传系统的可变性.
主要方法:
- 设计了一种混合rRNA, 结合了小和大亚单元rRNA序列.
- 使用短RNA链接器生成RIBO-T的共价链接的核糖体子单元.
- 在体外和大肠杆菌细胞中测试Ribo-T的功能,包括在没有野生类型核糖体的情况下的生长.
主要成果:
- 证明Ribo-T核糖体能够进行蛋白质合成.
- 展示了 Ribo-T 支持大肠杆菌细胞生长的能力.
- 使用Ribo-T建立了一个完全直角的核糖体传递 RNA 系统.
- 在Ribo-T中选择的rRNA突变可促进具有挑战性的蛋白序列的翻译.
结论:
- 绑定的核糖体 (Ribo-T) 是功能和可行的,挑战独立子单元的必要性.
- Ribo-T可以创建用于新生物功能的直角遗传系统.
- Ribo-T提供了一个探索核糖体功能和设计新能力的平台.
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