UAAとUAGのナンセンスコドンの酵母抑制剤は,tRNAを介してin vitroで効率的に働く
Cell
|March 1, 1976
まとめ
この研究は,細胞フリータンパク質合成システムを使用して,遺伝子変異のインビトロ抑制を実証しています. 抑制剤変異を伴う酵母tRNAは,タンパク質合成の誤りを修正し,機能性タンパク質の生産を可能にします.
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
- バイオケミストリー バイオケミストリー
背景:
- 細胞フリータンパク質合成システムは,トランスレーションメカニズムの研究に不可欠です.
- 遺伝的変異は非機能的なタンパク質につながり,生物学的プロセスに影響を与える可能性があります.
- 遺伝子発現と終了を理解することは,分子生物学において根本的なものです.
研究 の 目的:
- 再構成された非細胞タンパク質合成システムの機能的能力を調査する.
- イーストサプレッサーtRNAを用いた遺伝子変異のインビトロ抑制を調査する.
- 特定の遺伝子のストップコドンを特定し,特徴づけること.
主な方法:
- イースト,クレブスアシテス細胞,ウサギの網膜細胞の成分を用いて,細胞のないハイブリッドシステムを構築した.
- 様々な源 (酵母,アデノウイルス,ウサギのグロービン,細菌菌Qbeta) のメッセンジャーRNAを翻訳した.
- バクテリオファグのQbeta合成酵素遺伝子の変異は,アンバーとオークのサプレッサー変異を持つ酵母菌株を使用して分析されました.
- 抑制におけるtRNAの役割は,抑制株からtRNAを浄化することによって確認された.
主要な成果:
- 細胞のないシステムは,多様なメッセンジャーRNAを成功裏に翻訳した.
- イーストアンバーサプレッサー変異 (SUP6-2,RL-1) は,Qbeta合成酵素遺伝子のアンバー変異を in vitroで部分的に抑制した.
- の抑制剤SUP4-1は,Qbeta合成酵素遺伝子の読み込みを有効にし,UAAを終結子コードンとして示しました.
- サプレッサー菌株から精製されたtRNAは,非サプレッサー系での抑制を媒介するために不可欠でした.
結論:
- 細胞フリーシステムは,遺伝的抑制を研究し,終末コードンを特定するために利用できます.
- 特定のtRNA分子は,翻訳中にストップコドンを認識し抑制する責任を負う.
- この研究は,読み込みタンパク質合成に基づいたオクア抑制の分析を提供します.
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