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Messenger RNA-Programmed incorporation of multiple N-methyl-amino acids into linear and cyclic peptides

机译:Messenger RNA程序,将多个N-甲基氨基酸整合到线性和环状肽中

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摘要

Natural peptide products often contain N-methylated backbones, and such a modification plays a crucial role in making natural peptides peptidase resistant and membrane permeable. Here, we demonstrate the ribosomal synthesis of N-methyl-peptides by means of genetic code reprogramming. Two key technologies, a ribozyme-based de novo tRNA acylation (flexizyme) system and an E coli reconstituted cell-free translation (PURE) system, were used in order to reassign arbitrarily chosen codons to N-alpha-methylated amino acids ((Me)aa). Using this combination, we determined the general structural requirement of "accessible" Meaa and demonstrated their multiple incorporations into the nascent peptide chain according to the assignments made on mRNA, giving linear and cyclic N-methyl-peptides in high purities. This platform technology offers a convenient tool for the construction of N-methyl-peptide libraries, potentially leading to the discovery of therapeutic peptides.
机译:天然肽产品通常含有N-甲基化的主链,这种修饰在使天然肽具有抗肽酶作用和膜渗透性方面起着至关重要的作用。在这里,我们通过遗传密码重新编程证明了N-甲基肽的核糖体合成。为了将任意选择的密码子重新分配给N-α-甲基化氨基酸,使用了两种关键技术,即基于核酶的从头tRNA酰化(flexizyme)系统和大肠杆菌重构的无细胞翻译(PURE)系统。 )aa)。使用这种组合,我们确定了“可接近的” Meaa的一般结构要求,并根据对mRNA的指定证明了它们多次掺入新生的肽链中,从而获得了高纯度的线性和环状N-甲基肽。该平台技术为构建N-甲基肽文库提供了方便的工具,有可能导致发现治疗性肽。

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