オスモライトによる冷凍保護とオスモ保護の共通源
Roy Govrin1, Tal Obstbaum1, Uri Sivan1
1Department of Physics and the Russell Berrie Nanotechnology Institute , Technion - Israel Institute of Technology , Technion City, Haifa 3200003 , Israel.
Journal of the American Chemical Society
|August 15, 2019
まとめ
プロリンやグリシンベータインのようなオスモライトは 充電された表面に対する低温の影響を抵消することによって 細胞を寒冷ストレスから守ります これらの化合物は,冷凍保護剤と osmoprotectantsの両方として, 厳しい条件での生存に不可欠です.
科学分野:
- バイオ物理学
- 生物化学
- 細胞生物学
背景:
- 研究では,高塩分濃度のクーロン相互作用に対するオスモライトの効果が明らかになった.
- 低温保護中のこれらの相互作用に対するオスモライトの影響については,理解は限られている.
研究 の 目的:
- 塩とオスモライトを含む溶液中の充電された表面間のクーロン相互作用に対する低温の影響を調査する.
- 寒さによる表面電荷の変化に対するオスモライトの保護機構を解明する.
主な方法:
- 異なる温度下での三元溶液 (塩とオスモリート) の充電された表面相互作用の探査.
- イオン吸収と表面電荷の中和/再充電の分析
主要な成果:
- 低温では余分な塩分を模倣し,カウンターイオン吸収を増加させ,充電された表面を中和します.
- プロリンとグリシンベータインは,吸収された対陽子を放出し,それによって表面を再充電することで,この効果を逆転させることが示されました.
- この対抗メカニズムは,これらのオスモライトの冷凍保護とオスモ保護の役割を説明します.
結論:
- この研究では,オスモライトは 寒さによる表面電荷中和に抵抗し,効果的な冷凍保護剤として機能することを明らかにしました.
- このメカニズムは,寒さや干ばつのストレスに直面している生物によるオスモライトの蓄積を説明します.
- プロリンとグリシンベータインは,クーロン相互作用を調節することにより,冷凍保護剤とオスモ保護剤として二重の役割を果たしています.
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