カリフラワーモザイクウイルス35S RNAの非線形リボソーム移動
J Fütterer1, Z Kiss-László, T Hohn
1Friedrich Miescher-Institute, Basel, Switzerland.
Cell
|May 21, 1993
まとめ
カリフラワーモザイクウイルス35S RNAリーダー配列は,翻訳を阻害することができますが,特定の要素は,植物細胞のダウンストリーム遺伝子発現を可能にします. このプロセスは,分離したRNA分子の間でも,スキャン複合体経由で内部領域をバイパスすることを含む.
科学分野:
- 分子生物学は分子生物学である.
- 植物ウイルス学 ウイルス学
- 遺伝子発現の規制について
背景:
- カリフラワーモザイクウイルス (CaMV) 35S RNAは600核酸のリーダー配列を特徴としています.
- このリーダーには,下流のコーディング領域の翻訳を抑制できる小さなオープン・リーディング・フレーム (sORF) が含まれています.
研究 の 目的:
- CaMV 35S RNAリーダー内の下流のコーディング領域の翻訳を規制する規制メカニズムを調査する.
- 特定の植物細胞における翻訳開始に不可欠な,または欠かせない特定のRNA要素を特定する.
主な方法:
- CaMV 35S RNAのリーダー配列の分析と,その下流翻訳への影響.
- 幹回路構造とコーディング領域の挿入を含むリーダー配列の突然変異.
- 特定の植物細胞のタイプの翻訳を調査する.
- 独立したRNA分子間のトランス作用シャントの試験.
主要な成果:
- 下流のコーディング領域の翻訳は,RNA 5'端末および他のリーダー要素に依存する特定の植物細胞で許可されています.
- リーダーの中央部分は不要か,翻訳を廃止することなく挿入を収容することができます.
- "シャントリング"と呼ばれる現象により,スキャン複合体は抑制領域をバイパスすることができます.
- また,シャントリングは,異なるRNA分子間のトランスで発生することが示されました.
結論:
- CaMV 35S RNAのリーダーは,sORFsによる翻訳抑制を克服するためにシャントメカニズムを使用しています.
- このシャントは,特定のRNA特性によって調節される下流遺伝子の効率的な発現を可能にします.
- シャント機能は,シスとトランスの両方を操作できる柔軟なメカニズムです.
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