Tatは,新興の標的RNAを介してヒト免疫不全ウイルスをトランス活性化します
B Berkhout1, R H Silverman, K T Jeang
1Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, Bethesda, Maryland 20892.
Cell
|October 20, 1989
まとめ
ヒト免疫不全ウイルス1型 (HIV-1) のトランス活性化タンパク質Tatは,TAR要素が機能するために特定のRNA二次構造を必要とします. これは,TatがHIV-1ゲノム発現中の新生RNAとしてTARを認識していることを示唆している.
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
- RNA 構造 RNA 構造
背景:
- HIV-1の遺伝子発現は,ウイルスのトランス活性化タンパク質 Tat. に大きく依存しています.
- Tatは,DNAとRNAの両形態に存在する TAR (トランス活性化反応) 要素と相互作用します.
- Tatによって認識されたTAR (DNAまたはRNA) の正確な形は不明である.
研究 の 目的:
- Tatは,その機能のためにTAR要素の特定のRNA二次構造を必要とするかどうかを調査する.
- TatがTARをDNAまたはRNA要素として認識するかどうかを判断する.
- Tat媒介型トランス活性化のメカニズムを解明する.
主な方法:
- 主要配列を変更することなく,TARのRNA二次構造を変更するために,分子内突然変異が採用されました.
- 改変されたTAR要素の生物学的活性を評価するために,アッセイが行われました.
- トランスアクティベーション効率は,一時的に形成されたTAR RNAヘアピンを持つトランスクリプトで測定されました.
主要な成果:
- TAR要素の特定のRNA二次構造は,Tat媒介の生物学的活動に不可欠である.
- トランスクリプトは,一時的にネイティブのTAR RNAヘアピンを形成し,Tat.によって完全にトランス活性化されます.
- TAR要素は,Tat.によって生まれたRNA構造として認識されています.
結論:
- TATとTARの相互作用は,そのRNAの二次構造に依存しています.
- Tatは,その新生RNA合成中にTAR要素を認識する可能性が高い.
- この発見は,HIV-1遺伝子調節のメカニズムに関する重要な洞察を提供します.
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