ロウス・サルコマウイルスのガグポル領域におけるリボソームフレームシフトのシグナル
T Jacks1, H D Madhani, F R Masiarz
1Department of Biochemistry and Biophysics, University of California, San Francisco 94143.
Cell
|November 4, 1988
まとめ
ルース・サーコマウイルス (RSV) のガグポルタンパク質合成は,リボソームのフレームシフトに依存しています. この研究は,フレームシフトの場所を特定し, gag ターミネーターから独立して,tRNA スリップが鍵となるメカニズムであることを明らかにしています.
科学分野:
- 分子生物学は分子生物学である.
- ウイルス学 ウイルス学 ウイルス学
- 遺伝学 遺伝学とは
背景:
- ルース・サーコマウイルス (RSV) は,リボソームのフレームシフトにより,必須のガグポルタンパク質を発現します.
- このプロセスは,逆転写と統合のための機能性酵素を生成するために,翻訳的な読み取りフレームのシフトを伴う.
研究 の 目的:
- RSVゲノム内の正確なフレームシフトの場所を特定するために.
- RSVにおけるリボソームフレームシフトを駆動する分子メカニズムを解明する.
- ガグポルタンパク質合成の調節におけるRNA構造と突然変異の役割を調査する.
主な方法:
- 遺伝子操作によるフレームシフトの場所の定位.
- tRNAスリップの解析とフレームシフトにおけるその役割.
- RSVのポルとガグ配列のサイト指向型変異.
- ガグポルタンパク質の産生を評価するためのインビトロ合成アッセイ.
- 幹のループ形成を含むRNA構造分析.
主要な成果:
- フレームシフトの部位が特定され,そのメカニズムは,隣接する2つのtRNAの単核酸5'スリップとして特定されました.
- ガグ・ターミネーターのシーケンスがフレームシフトには欠かせないことが判明した.
- ガグポル合成に影響するRSVポルの変異は,隣接するRNA幹ループ構造を形成する能力と相関しています.
- フレームシフト・サイトとステム・ループを含む最小147ヌクレオチドのRSVRNA配列は,フレームシフトを直接するために十分であった.
結論:
- RSVにおけるリボソームフレームシフトは,主に特定の部位でのtRNAスリップによって媒介されます.
- RNAの二次構造,特にフレームシフト部位付近の茎ループは,このプロセスを調節する上で重要な役割を果たします.
- 短いRNA配列は,フレームシフト能力を与えるのに十分であり,さらなる遺伝子研究のためのツールを提供します.
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