構造化されたD-RNA分子の結合は,L-RNAアプタマーによって行われます
Jonathan T Sczepanski1, Gerald F Joyce
1Departments of Chemistry and Molecular Biology and The Skaggs Institute for Chemical Biology, The Scripps Research Institute , 10550 North Torrey Pines Road, La Jolla, California 92037, United States.
Journal of the American Chemical Society
|August 28, 2013
まとめ
研究者らは,HIV-1トランス活性化反応性RNA (TAR) のD型に結合する新しいL-RNAアプタマーを開発した. この結合は鍵となる複合体を阻害し,L-アプタマーが構造RNAの潜在的な治療薬であることを示唆しています.
科学分野:
- * 分子生物学 * 分子生物学
- * 核酸化学について
- * ウイルス学 ウイルス学
背景:
- *HIV-1は,複製のためにトランス活性化反応性 (TAR) RNA要素に依存しています.
- * Tat-TARの相互作用は,TAR RNAの機能とウイルスの複製に不可欠です.
- * アプタマーとは,核酸の短い配列で,高い親和性と特異性で標的を結合するものです.
研究 の 目的:
- *HIV-1 TAR RNAの天然のD型を結合できるL-RNAアプタマーを開発する.
- * L-アプタメルの結合モードとD-TAR RNAとの親和性を調査する.
- * 構造RNAに対する治療薬としてのL-アプタマーの可能性を評価する.
主な方法:
- *L-TAR RNAに対するD-アプタマーを得るために,インビトロ選択を用いた.
- * 化学合成により,対応するL-アプタマーが作られました.
- *結合親和度 (Kd) と相互作用部位は,生体物理学的方法を使用して決定されました.
- *タット-TAR複合体の形成の抑制が評価されました.
主要な成果:
- * 100 nMの解離定数 (Kd) でD-TAR RNAを結合するL-アプタマーが合成されました.
- *L-アプタメルは,D-TAR RNAの6核酸ディスタルループにのみ結合する.
- *結合はワトソン・クリック配列ではなく,三次相互作用によって発生し,対極キラリティの核酸間の新しい結合モードを表します.
- *L-アプタマー結合は,必須のTat-TARリボ核タンパク質複合体の形成を阻害する.
結論:
- *この研究は,L-およびD-核酸の間の特定の三次相互作用の最初の例を示しています.
- * D-TAR RNAを標的にするL-アプタマーは,HIV-1複製の重要なステップを阻害することができます.
- * L-アプタマーはリボヌクレアースに耐性があるため,抗意味オリゴヌクレオチドに対する有望な代替手段として,構造RNAを治療的に標的とする.
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