用重新编码的基因组对大肠杆菌进行总合成
Julius Fredens1, Kaihang Wang1,2, Daniel de la Torre1
1Medical Research Council Laboratory of Molecular Biology, Cambridge, UK.
Nature
|May 17, 2019
概括
科学家设计了一种合成大肠杆菌基因组, 这种合成基因组重新编码能够删除重要的转移RNA,证明了新的基因组重构.
科学领域:
- 合成生物学
- 基因组学
- 分子生物学
背景情况:
- 自然界使用64个编码子来合成蛋白质,同义编码子编码单个氨基酸.
- 同义代码子选择对生物过程产生重大影响,变化可能是有害的.
研究的目的:
- 调查在基因组中使用的编码数的可行性.
- 设计一种合成大肠杆菌, 具有减少的编码组和重构的基因组.
主要方法:
- 一个四兆基合成基因组的高保真性融合总合成.
- 用定义的同义词替换特定的感觉和停止编码.
- 实施一个重编码和重构方案,最小的基因纠正.
主要成果:
- 已经成功地制造出一个具有61码的合成大肠杆菌基因组.
- 重新编码了18214个代码,使用了20个正规氨基酸的59个代码.
- 通过基因组重构实现了以前必需的转移RNA的删除.
结论:
- 证明了减少细菌基因组中必不可少的编码组的可能性.
- 建立了全基因组编码和重构的方法.
- 创造了一种具有简化遗传密码的新生物,并有可能进一步用于合成生物学.
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