6S RNAは,E. coliのRNAポリメラーゼの活動を調節する
1Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA. kwass@box-k.nih.gov
Cell
|July 13, 2000
まとめ
E. coli 6S RNAの機能が明らかになった:それはRNAポリメラーゼ,特にsigma70とβ/ββを結合する.
科学分野:
- 微生物学 微生物学とは
- 分子生物学は分子生物学である.
- 遺伝子規制 遺伝子規制
背景:
- 30年以上前に発見されたE. coli 6S RNAの機能は,依然としてほとんど不明です.
- 6S RNAの役割を理解することは,細菌の遺伝子調節を解読する上で極めて重要です.
研究 の 目的:
- E. coli 6S RNAの機能を明らかにする.
- 6S RNAとRNAポリメラーゼの相互作用を調査する.
主な方法:
- 6S RNAとRNAポリメラーゼサブユニット間の直接的な接触を特定するためのUVクロスリンク実験.
- 異なる成長段階における6SRNAの蓄積の分析.
- シグマ70-ホロ酵素の活性とプロモーター抑制に対する6SRNAの影響を測定するアッセイ.
主要な成果:
- 6SRNAは,RNAポリメラーゼと特異的かつ効率的に結合する.
- 6S RNAとRNAポリメラーゼのシグマ70およびβ/β'サブユニットとの直接的な接触が確認されました.
- 6SRNAレベルは静止期中に増加し,RNAポリメラーゼの活性が変化します.
- 6SRNAは,シグマ70とコアRNAポリメラーゼの安定した結合に不可欠です.
- 6SRNAは静止期において,シグマ70依存プロモーターからの転写を抑制する.
結論:
- 6SRNAは,特定の成長段階でRNAポリメラーゼの活性を調節する上で重要な役割を果たします.
- 6SRNAとRNAポリメラーゼの相互作用は,シグマ70-ホロ酵素の機能に影響することで遺伝子発現を調節する.
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