A non-natural protein having at least one ester bond in its polypeptide main chain is synthesized by using an in vivo translation system in a ribosome. The following components (a) to (c) are expressed in a cell or an cell extraction solution in the presence of an α-hydroxy acid: (a) an aminoacyl-tRNA synthetase which can activate the α-hydroxy acid; (b) suppressor tRNA which can bind to the α-hydroxy acid in the presence of the aminoacyl-tRNA synthetase; and (c) a gene encoding a desired protein having a nonsense mutation or a frame-shift mutation at a desired site.
利用
核糖体中的体内翻译系统,合成
多肽主链中至少有一个酯键的非天然蛋白质。在存在α-羟基酸的情况下,在细胞或细胞提取液中表达以下成分(a)至(c):(a) 可激活α-羟基酸的
氨基酰-tRNA 合成酶;(b) 在
氨基酰-tRNA 合成酶存在的情况下可与α-羟基酸结合的抑制 tRNA;(c) 编码所需蛋白质的
基因,该
基因在所需部位有无意义突变或框架移位突变。