トリメチラミンN酸化物はRNAの三次構造を安定させ,尿素の変性作用を弱める
Thomas C Gluick1, Sushma Yadav
1Department of Chemistry and Biochemistry, P.O. Box 19065, The University of Texas at Arlington, Arlington, TX 76019, USA. tcgluick@uta.edu
Journal of the American Chemical Society
|April 10, 2003
まとめ
トリメチラミンN酸化物 (TMAO) はRNAの三次構造を安定させ,尿素に対抗する.
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.
- 構造生物学 構造生物学とは
背景:
- トリメチラミンN酸化物 (TMAO) や尿素のようなオスモライトは,細胞が極端な環境で生き残るのに役立ちます.
- TMAOと尿素はサメと魚に1:2のモール比で存在し,TMAOは尿素のタンパク質不安定化作用を逆行する.
- RNAは,尿素によって無性化されていることが知られている.
研究 の 目的:
- TMAOがRNAの三次構造をタンパク質と同様に安定させるかどうかを調査する.
- TMAOがRNAに対する尿素の無性化作用を逆行するかどうかを判断する.
主な方法:
- Escherichia coli tRNAfmet.の三次構造にTMAOと尿素の影響を研究した.
- TMAOと尿素の異なるモール比で試験された構造的安定性.
主要な成果:
- TMAOは,Escherichia coli tRNAfmet.の三次構造を安定させることが判明しました.
- TMAOは,タンパク質で観察された同じ比率で,RNAに対する尿素の無性化効果を効果的に相殺しました.
- RNAの三次構造の安定性は,単にカチオン結合ではなく,溶媒の組成によって影響を受けます.
結論:
- TMAOはRNAの三次構造を安定させ,尿素の無性化効果を軽減する.
- 溶媒の性質は,RNAの三次構造の安定性において重要な役割を果たします.
- 不良なTMAO-phosphodiesterのバックボーン相互作用は,RNAの折り畳みを誘導する可能性があります.
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