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基于带电荷氨基酸α-NH2基团生物素化的氨酰-tRNA快速筛选。

Rapid selection of aminoacyl-tRNAs based on biotinylation of alpha-NH2 group of charged amino acids.

作者信息

Pütz J, Wientges J, Sissler M, Giegé R, Florentz C, Schwienhorst A

机构信息

Institüt für Molekulare Biotechnologie, Beutenbergstrasse 11, D-07745, Jena, Germany.

出版信息

Nucleic Acids Res. 1997 May 1;25(9):1862-3. doi: 10.1093/nar/25.9.1862.

Abstract

A rapid selection procedure to separate low amounts of aminoacylated tRNAs from large pools of inactive variants is described. The procedure involves a three-step protocol. After initial aminoacylation of a tRNA pool, N-hydroxysuccinimide ester chemistry is applied to biotinylate the alpha-NH2 group of the amino acid bound to the 3'-end of a tRNA. The biotin tag is used to capture the derivatized tRNAs on streptavidin-conjugated magnetic beads. Variants bound to the solid phase can be amplified by RT-PCR and transcription, providing tRNAs for subsequent selection rounds.

摘要

本文描述了一种从大量无活性变体中分离少量氨酰化tRNA的快速筛选方法。该方法包括一个三步方案。在对tRNA库进行初始氨酰化后,应用N-羟基琥珀酰亚胺酯化学方法对与tRNA 3'-末端结合的氨基酸的α-NH2基团进行生物素化。生物素标签用于在链霉亲和素偶联的磁珠上捕获衍生化的tRNA。与固相结合的变体可以通过RT-PCR和转录进行扩增,为后续的筛选轮次提供tRNA。

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Ribozyme-catalysed amino-acid transfer reactions.核酶催化的氨基酸转移反应。
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