DNA表面の近くで異常な速度の水分分流動
John M Franck1,2, Yuan Ding3, Katherine Stone1,4
1Department of Chemistry and Biochemistry, University of California , Santa Barbara, California 93106, United States.
Journal of the American Chemical Society
|August 11, 2015
まとめ
オーバーハウザー効果のダイナミックな核極化 (ODNP) は,タンパク質や膜の近くの水とは異なり, DNAの表面水が異常な速さで動いていることを明らかにします. この素早く動く水は DNAの相互作用の活性化バリアを下げます
科学分野:
- バイオ物理学
- 化学物理学
- 分子生物学
背景:
- オーバーハウザー効果のダイナミックな核極化 (ODNP) 技術は,表面の近くの水の移動性を探査します.
- DNA表面の水力学を理解することは 分子相互作用に不可欠です
研究 の 目的:
- DNA表面での水の動態を測定するためのODNPの能力を拡張する.
- DNA複合体周辺の水の変換的移動性を調査する.
主な方法:
- 酸化窒素のラベルをDNAのリン酸骨に結合する.
- 新しいODNP分析を用いて 水の個体群を区別する.
- 束縛されたDNAと変異した窒素酸化物の移動性を用いた対照試験を実施する.
主要な成果:
- DNA表面の近くにある重要な水群は,高速で大量に変換される拡散を示しています.
- この移動水は タンパク質や膜の表面の近くにある水よりも速く移動します
- DNAの表面は水分ネットワークの大部分と弱く相互作用する.
結論:
- DNAの表面は他の生物分子表面と比較して異常な速度の水分拡散を促進します.
- 表面水との弱い相互作用は,DNA媒介の相互作用の活性化バリアを下げることができます.
- この発見は 生物学的過程における DNAの役割について 新たな洞察をもたらします
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