诱导非结构化五在水中的alpha-helical的金属剪贴
Michelle T Ma1, Huy N Hoang, Conor C G Scully
1School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane Qld 4072, Australia.
Journal of the American Chemical Society
|March 26, 2009
概括
金属离子可以在水中的短中诱导α-性. 化的酸显示出最高的α-helicity,这表明金属离子对于酸折叠是有用的.
科学领域:
- 生物化学 生物化学
- 生物物理化学 生物物理化学
- 材料科学 材料科学 材料科学
背景情况:
- 短通常缺乏水中的稳定螺旋结构,这是由于溶剂对键的竞争.
- 金属蛋白在螺旋区域内利用金属离子,这表明中可能存在金属诱导或稳定螺旋性.
- 之前的研究仅在非水性溶剂或在特定水条件下观察到金属诱导的螺旋性.
研究的目的:
- 为了比较cis-[Ru ((NH ((3)) ((4) ((溶剂)) ((2))) ((2+) 和[Pd ((en)) (((溶剂)))) 作为金属剪贴用于在水中的短中诱导alpha-helicity的有效性.
- 研究影响水溶液中短金属的α-螺旋稳定性的因素.
- 探索金属离子作为折的工具的潜力,以及它们在原生蛋白质折叠中的作用.
主要方法:
- 使用鲁和复合物的金属的合成和表征.
- 谱学分析 (例如,循环二重化) 用于量化水溶液中的α-度.
- 对不同序列 (Ac-HARAH-NH(2) 和Ac-MARAM-NH(2) 和金属离子进行比较研究.
主要成果:
- 和离子都在水中的短 (五个残留物) 中诱导了α-性.
- 五酸Ac-MARAM-NH(2) 在与鲁结合时表现出更大的α-螺度,达到约80%的螺度.
- 氨酸残留物在稳定Ru(II) 氧化状态时比histidine残留物要有效得多.
结论:
- 金属离子可以有效地诱导,而不是仅仅稳定,在水性环境中的短中的α-.
- 该研究确定了控制水中α-螺旋转向稳定的关键因素,突出了特定氨基酸残留和金属协调的作用.
- 金属离子是控制结构的有希望的工具,这对理解原生蛋白质折叠机制有意义.
相关概念视频
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The primary structure of a protein is its amino acid sequence.
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