基因编码扩展工具包的合理设计,用于D-氨基酸的体内编码
Han-Kai Jiang1,2,3, Jui-Hung Weng1, Yi-Hui Wang1,4
1Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan.
Frontiers in genetics
|October 31, 2023
概括
研究人员设计了一种新型酶突变体 (DFRS2),在核糖体合成过程中将D-phenylalanine类似物纳入蛋白质中. 这一突破使得用D-氨基酸制造出大型的功能性蛋白质,扩大了合成生物学应用.
科学领域:
- 生物化学 生物化学
- 合成生物学 合成生物学
- 蛋白质工程是指蛋白质工程.
背景情况:
- D-氨基酸 (DAA) 具有不同的生理作用,合成生物学家将其用于新型蛋白质功能.
- 使用DAA生产大型蛋白质是具有挑战性的,因为自然机械有限,并且有性歧视.
- 以前的研究表明,pyrrolysyl-tRNA合成酶 (PylRS) 具有广泛的基质特异性.
研究的目的:
- 设计一个具有增强充电tRNA与D-phenylalanine类型 (DFAs) 的能力的PylRS突变.
- 为了使含有DFAs的蛋白质能够in vivo进行核糖体合成.
- 为了证明这个系统在创造新型蛋白质方面的实用性.
主要方法:
- 设计了一种新的PylRS突变物 (DFRS2) 用于DAA的整合.
- 在超级文件绿色光蛋白和人类重链费里丁中进行了体内翻译DAA替代.
- 进行了体外氨基化动力测试以描述DFRS2活性.
主要成果:
- 在DFRS2突变有效地充电tRNA与DFAs.
- 通过核糖体合成,DFAs成功地被纳入活体蛋白质中.
- 目标蛋白的生理化学特性被DAA替代改变.
结论:
- 突变的DFRS2促进体内与DFAs的蛋白质合成,克服了以前的限制.
- 这种方法可以创建具有修改性质的大型异体基质蛋白质.
- 这种工程系统在促进蛋白质工程和合成生物学方面具有显著的潜力.
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