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Nanomanipulation of Single RNA Molecules by Optical Tweezers
Published on: August 20, 2014
分子混雑は,排除された体積効果によって折りたたまれたRNA構造を安定させる
Duncan Kilburn1, Joon Ho Roh, Liang Guo
1T. C. Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, Maryland 21218, USA.
Journal of the American Chemical Society
|June 5, 2010
まとめ
ポリエチレングリコール (PEG) の分子混雑は,溶液の均衡を変化させることで,コンパクトなRNA構造を好みます. この研究は,PEG-1000が細菌のリボエンザイムによりコンパクトな状態を誘導し,折り畳みの熱力学に影響を与えることを示しています.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- バイオフィジックス 生物物理学
背景:
- マクロ分子折り畳みは,クラウダー分子の存在を含む溶液条件の影響を受けます.
- RNAの in vivo 折り畳みを理解するには,分子混雑効果を考慮する必要があります.
- ポリエチレングリコール (PEG) は,これらの効果を研究するために使用される一般的な分子クラウダーです.
研究 の 目的:
- ポリエチレングリコール1000 (PEG-1000) が,細菌群Iのリボジームの折りたたみに対する影響を調査する.
- RNA構造に対するPEG-1000の排除された体積効果を定量化するために.
- PEG-1000がRNAの折り畳みの熱力学にどのように影響するかを決定する.
主な方法:
- スモールアングルX線散射 (SAXS) 実験は,64 kDaの細菌群Iリボジームで実施されました.
- 実験は,PEG-1000 (0-20%重量/体積) の濃度が変化している状態で行われました.
- 水とイオン活動の変化を測定し,理論モデルを適用して,除外された体積効果を評価した.
主要な成果:
- PEG-1000は,よりコンパクトなRNA構造を好むことが判明し,容積効果は除外されています.
- 折りたたまれた状態への移行は,PEG.の存在下で,より低いMgCl (((2) 濃度で発生しました.
- 展開されたRNAの回転半径は,PEG濃度が増加するにつれて76 Åから64 Åに減少した.
結論:
- RNAの折りたたみに対する分子クローダーとしてのPEG-1000の支配的な効果は,除外された体積効果です.
- PEG-1000は,展開状態をステリカルに阻害することによって,コンパクトなRNA構成を促進します.
- これらの発見は,細胞RNAの折り畳みプロセスにおける分子混雑を考慮することの重要性を強調しています.
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