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イーストのスーパーサプレッサーは,無意味なコードンを in vitro で翻訳できる変化したtRNAである
Cell
|November 1, 1975
まとめ
スーパースプレッサー菌株からの酵母移植RNA (tRNA) は,無意味な変異を in vitro で翻訳することができます. この研究は,ナンセンス抑制のための保存されたメカニズムを示し,哺乳類のナンセンス抑制剤を特定するのに役立ちます.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- 無意味な突然変異は,タンパク質合成を早めに終了させることができます.
- 抑制性tRNAは,これらの変異を覆すことができます.
- 無意味な抑制の理解は,遺伝子研究にとって極めて重要です.
研究 の 目的:
- 哺乳類の細胞のないシステムで酵母tRNAを使用してナンセンス抑制を調査する.
- イーストとE. coliにおけるナンセンス抑制のメカニズムを比較する.
- 哺乳類のストップコドンとしてアンバーコドン (UAG) を検証する.
主な方法:
- マウスのL細胞からタンパク質を合成するシステムを活用した.
- バクテリオファグQbeta.の珀色変異体からRNAを翻訳することによって,ナンセンス抑制を試した.
- 特定の免疫プレシピテーションアッセイを使用して,抑制されたタンパク質を定量的に検出しました.
主要な成果:
- イーストのスーパーサプレッサーtRNAは,野生型のtRNAではないが,無意味な変異を in vitroで翻訳した.
- 哺乳類のシステムも,E. coliのサプレッサーtRNAに反応し,保存されたメカニズムを示した.
- 哺乳類の鎖末端コドンとしてUAGが確認されました.
結論:
- 無意味な抑制の生化学的メカニズムは,酵母とE. coliの間に保存されています.
- 開発された測定システムは,哺乳類のナンセンスサプレッサーを検出するのに有効です.
- この研究は,新しい哺乳類のナンセンス抑制剤を発見するためのツールを提供します.
さらに関連する動画
関連する概念動画
Types of RNA
Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...
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...
Types of RNA
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in regulating gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA Performs Diverse...
RNA Performs Diverse...
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...

