转移RNA
突变体
生物
翻译(生物学)
大肠杆菌
氨酰tRNA合成酶
蛋白质生物合成
合成生物学
定向进化
氨基酰基tRNA合成酶
核糖体
氨基酸
抑制突变
核糖核酸
生物化学
细胞生物学
遗传学
基因
信使核糖核酸
作者
Delilah Jewel,Rachel E. Kelemen,Rachel L. Huang,Zeyu Zhu,Bharathi Sundaresh,Xiaofu Cao,Kaitlin Malley,Zeyi Huang,Muhammad Pasha,Jon Anthony,Tim van Opijnen,Abhishek Chatterjee
出处
期刊:Nature Methods
[Springer Nature]
日期:2022-12-22
卷期号:20 (1): 95-103
被引量:16
标识
DOI:10.1038/s41592-022-01706-w
摘要
Site-specific incorporation of unnatural amino acids (Uaas) in living cells relies on engineered aminoacyl-transfer RNA synthetase–tRNA pairs borrowed from a distant domain of life. Such heterologous suppressor tRNAs often have poor intrinsic activity, presumably due to suboptimal interaction with a non-native translation system. This limitation can be addressed in Escherichia coli using directed evolution. However, no suitable selection system is currently available to do the same in mammalian cells. Here we report virus-assisted directed evolution of tRNAs (VADER) in mammalian cells, which uses a double-sieve selection scheme to facilitate single-step enrichment of active yet orthogonal tRNA mutants from naive libraries. Using VADER we developed improved mutants of Methanosarcina mazei pyrrolysyl-tRNA, as well as a bacterial tyrosyl-tRNA. We also show that the higher activity of the most efficient mutant pyrrolysyl-tRNA is specific for mammalian cells, alluding to an improved interaction with the unique mammalian translation apparatus. Virus-assisted directed evolution of tRNAs (VADER) enables selection of improved suppressor tRNAs in mammalian cells. Improved pyrrolysyl- and tyrosyl-tRNA variants enhance unnatural amino acid incorporation in mammalian systems.
科研通智能强力驱动
Strongly Powered by AbleSci AI