HIV-1 Rev応答要素の異常なトポロジック構造
Xianyang Fang1, Jinbu Wang, Ina P O'Carroll
1Protein-Nucleic Acid Interaction Section, Structural Biophysics Laboratory, HIV Drug Resistance Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Frederick, MD 21702, USA.
Cell
|November 19, 2013
まとめ
HIVウイルスは,Rev応答要素 (RRE) と呼ばれるユニークな"A"形RNA構造を使用して,ウイルスの複製に不可欠なプロセスである独自の遺伝物質を特異的に輸出します.
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
- 構造生物学 構造生物学とは
背景:
- 未配合および単発配合のウイルスmRNAの核輸出は,HIVの複製に不可欠です.
- HIV mRNAが宿主RNAに対して選択的にエクスポートされるメカニズムは,25年以上にわたって不明のままである.
研究 の 目的:
- HIV Rev.タンパク質によるウイルスmRNAの特定認識の構造的基礎を解明する.
- ウイルスが,そのRNAを,輸出のための豊富な細胞RNAから区別する方法を理解する.
主な方法:
- ウイルスのRev応答要素 (RRE) の構造分析.
- RREとRevタンパク質の結合相互作用を調査する.
主要な成果:
- RREは,珍しい"A"のようなトポロジック構造を採用しています.
- この構造は,Revタンパク質の結合部位の2つの線路を示し,Rev二次体にとって最適な距離 (~55 Å) に位置づけています.
- "A"の構造的な"脚"と結合部位間の距離は,RRE機能にとって非常に重要です.
結論:
- RREの記述された"A"のような構造は,Rev.結合の特異性を説明する.
- この構造的メカニズムは,HIVのライフサイクルにおける重要なステップであるウイルスRNAの選択的輸出の基礎となっています.
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