Crucial optimization of translational components towards efficient incorporation of unnatural amino acids into proteins in mammalian cells.

Crucial optimization of translational components towards efficient incorporation of unnatural amino acids into proteins in mammalian cells.
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翻译组件的关键优化,以将非天然氨基酸有效掺入哺乳动物细胞中的蛋白质中

DOI:
10.1371/journal.pone.0067333
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Zhang ZJ
Zhang ZJ
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Xiang L;Moncivais K;Jiang F;Willams B;Alfonta L;Zhang ZJ

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将非天然氨基酸 (UAA) 定点整合到蛋白质中的能力是蛋白质工程中的强大工具。虽然数十种 UAA 已成功引入大肠杆菌细胞表达的蛋白质中,但创建能够掺入 UAA 并用于哺乳动物系统的 tRNA 和 tRNA 合成酶对却更具挑战性。通过改变现有非自然对的正交性,先前在大肠杆菌中使用的进化对可以用于哺乳动物细胞。这将绕过必须进化突变合成酶的繁琐步骤,并允许快速开发新的哺乳动物对。细胞中可表达的含 UAA 蛋白数量的一个主要限制是带 UAA 的正交抑制 tRNA 的可用性。通过使用天然哺乳动物tRNA启动子,可以大大增加功能性抑制tRNA的量。此外,突变合成酶对抑制性 tRNA 的识别能力的增强最终将导致更多带有 UAA 的 tRNA 的出现。
The ability to site-specifically incorporate unnatural amino acids (UAAs) into proteins is a powerful tool in protein engineering. While dozens of UAAs have been successfully introduced into proteins expressed by Escherichia coli cells, it has been much more challenging to create tRNA and tRNA-Synthetase pairs that enable UAAs incorporation, for use in mammalian systems. By altering the orthogonality properties of existing unnatural pairs, previously evolved pairs for use in E. coli could be used in mammalian cells. This would bypass the cumbersome step of having to evolve mutant synthetases and would allow for the rapid development of new mammalian pairs. A major limitation to the amount of UAA-containing proteins that can be expressed in the cell is the availability of UAA-charged orthogonal suppressor tRNA. By using a natural mammalian tRNA promoter, the amount of functional suppressor tRNA can be greatly increased. Furthermore, increasing recognition of the suppressor tRNA by the mutant synthetase will ultimately lead to the appearance of more UAA-charged tRNA.
DOI: 10.1371/journal.pone.0011263
发表时间: 2010-06-22
期刊: PloS one
影响因子: 3.7
作者:
Thibodeaux GN;Liang X;Moncivais K;Umeda A;Singer O;Alfonta L;Zhang ZJ
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