ポリオウイルスによる転写因子の活性抑制
N Crawford1, A Fire, M Samuels
1Center for Cancer Research, Massachusetts Institute of Technology, Cambridge 02139.
Cell
|December 1, 1981
まとめ
ポリオウイルス感染症は,重要な転写因子を枯渇させることにより,宿主細胞RNA合成を阻害する. この研究では,感染した細胞抽出物にはRNAポリメラーゼIIに必要な成分が欠けていて,DNA転写に影響を及ぼすことがわかりました.
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
- バイオケミストリー バイオケミストリー
背景:
- ポリオウイルスの感染は,RNA合成を含む宿主細胞のプロセスを破壊する.
- ホストの転写に対するウイルスの干渉の分子メカニズムを理解することは極めて重要です.
研究 の 目的:
- 宿主細胞RNA合成のポリオウイルス誘発阻害を調査する.
- 減少したRNAポリメラーゼII活性に起因する特定の分子欠陥を特定する.
主な方法:
- 偽感染およびポリオウイルスに感染したHeLa細胞からの転写抽出物の準備.
- RNAポリメラーゼIIおよびIIIによるDNAテンプレートの特異的な転写の評価.
- 転写因子 (S100) と浄化されたポリメラーゼII.による補給測定法.
- フォスフォセルロースコラムでS100を分割する.
主要な成果:
- ポリオウイルスに感染した細胞抽出物は,RNAポリメラーゼIIによる特定のDNA転写が著しく減少したことを示した.
- RNAポリメラーゼIIIによる正確な転写はわずかにしか影響されなかった.
- S100の補充はRNAポリメラーゼIIの転写を回復させ,純粋化されたポリメラーゼIIは効果を示さなかった.
- 本質的因子は,S100分化時に0.35Mから1MKClの範囲で溶解された.
結論:
- ポリオウイルス感染は,特定のRNAポリメラーゼII転写に必要な宿主細胞因子の欠乏につながります.
- この欠乏は,直接的な阻害分子ではなく,宿主細胞RNA合成の障害の原因であるようです.
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