化学的にアキュレートされたtRNAはゼブラフィッシュ胚で機能する
Wes Brown1, Jason D Galpin2, Carolyn Rosenblum1
1Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States.
Journal of the American Chemical Society
|January 20, 2023
まとめ
化学的にアチラするtRNAは,ゼブラフィッシュに非自然なアミノ酸を特定して組み込むことを可能にします. この方法は,光学酵素制御のための光籠ヒスティジンの組み込みを可能にする,工学合成酵素の限界を克服します.
科学分野:
- 生物化学
- 分子生物学
- 発達生物学
背景:
- 遺伝子コードの拡張により,非正規のアミノ酸を含むタンパク質が作られます.
- エンジニアリングされたアミノアシルtRNA合成酵素は,新しいアミノ酸を組み込むための鍵です.
- 大規模または複雑な非自然なアミノ酸のサイドチェーンに対応するための合成酵素の能力には制限があります.
研究 の 目的:
- 斑馬魚の胚に非自然なアミノ酸を組み込むための強力な方法を確立する.
- 特定の非自然なアミノ酸に対応する 合成酵素の限界を克服する
- 光ケージのアミノ酸を用いて in vivo の酵素活性の光学制御を証明する.
主な方法:
- サイト固有の非自然なアミノ酸の組み込みのために,tRNAの化学的アサイレーションを使用した.
- 人間の健康のためのモデル生物であるゼブラフィッシュの胚に この方法を適用しました
- 合成工程に挑戦する光ケージヒスティジンアナログを組み込みました.
主要な成果:
- 不自然なアミノ酸をゼブラフィッシュのタンパク質に強固に組み込みました
- 合成酵素の技術的な課題を克服し,写真ケージヒスティジンアナログを成功裏に組み込みました.
- 生きたゼブラフィッシュ胚の酵素活性に対する光学制御を,光ケージヒスティディンを組み込むことによって実証した.
結論:
- 化学的tRNAアサイレーションは,特に難易度の高いアミノ酸の遺伝子コードの拡張に強力な代替手段を提供します.
- このアプローチは,適合した機能を備えた新しいタンパク質を in vivo で作るためのツールキットを拡張します.
- この方法は,複雑なモデル生物における生物学的過程の正確な時空制御を可能にします.
関連する概念動画
RNA Structure
Overview
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA): messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a...
Transfer RNA Synthesis
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
tRNA Activation
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...
RNA Structure
The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three...
Transfer RNA Synthesis
One of the unique features of tRNA is the presence of modified bases. In some tRNAs, modified bases account for nearly 20% of the total bases in the molecule. Altogether, these unusual bases protect the tRNA from enzymatic degradation by RNases.
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
Each of these chemical modifications is carried by a specific enzyme, post-transcription. All of these enzymes have unique base and site-specificity. Methylation, the most common chemical modification, is carried by at least nine different enzymes, with...
tRNA Activation
Aminoacyl-tRNA synthetases are present in both eukaryotes and bacteria. Though eukaryotes have 20 different aminoacyl-tRNA synthetases to couple to 20 amino acids, many bacteria do not have genes for all of these aminoacyl-tRNA synthetases. Despite this, they still use all 20 amino acids to synthesize their proteins. For instance, some bacteria do not have the gene encoding the enzyme that couples glutamine with its partner tRNA. In these organisms, one enzyme adds glutamic acid to all of the...


