テトラヒメナからのリボエンザイムによって触媒化されたDNA分裂

D Herschlag¹, T R Cech

¹Howard Hughes Medical Institute, Department of Chemistry and Biochemistry, University of Colorado, Boulder 80309-0215.

Nature

|March 29, 1990

まとめ

この研究は,RNA酵素がDNAを分割できることを示しています.しかし,RNAよりも効率が低いです. この発見は,遺伝子工学と特定のDNA切断ツールの設計のための新しい道を開く.

科学分野:

バイオケミストリーバイオケミストリー
分子生物学は分子生物学である.
酵素学酵素学とは

背景:

RNA酵素,またはリボ酵素は,生化学反応を触媒として知られている.
Tetrahymena thermophilaの自己スプライシング介入配列は,よく特徴づけられたリボ酵素である.

研究の目的:

DNA基板上のテトラヒメナ・サーモフィラ由来RNA酵素の触媒的能力を調査する.
基板結合と触媒におけるRNA 2'-ヒドロキシル群の役割を理解する.

主な方法:

テトラヒメナ・サーモフィラ由来RNA酵素を用いて.
オリゴデオキシリボヌクレオチドを基板として使用する.
サブストラット結合親和性と割裂運動を分析する.

主要な成果:

RNA酵素は,オリゴデオキシリボヌクレオチド基板のシーケンス固有の割れ方を実証しました.
DNA基板の結合は弱く,RNA基板と比較して割れは遅かった.
RNA 2'-ヒドロキシル群が結合と化学の両段階において重要であることが強調された.

結論:

RNAによる触媒は,DNA基板に拡張することができます.
この発見は,干渉配列転置の新たな可能性を示唆しています.
新しい配列特異のDNA分裂剤の設計の可能性が示されています.

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