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进化保守的Tyr169稳定了质蛋白的β2-α2循环
Danzhi Huang1, Amedeo Caflisch
1Department of Biochemistry University of Zürich , Winterthurerstrasse 190, CH-8057 Zürich, Switzerland.
Journal of the American Chemical Society
|February 12, 2015
概括
蛋白的β2-α2循环结构是其转换的关键. 一个特定的突变 (Y169G) 降低了这种循环过渡的能量屏障,影响了聚.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 分子动力学分子动力学
背景情况:
- 哺乳动物质蛋白 (PrP) 存在于细胞 (PrP(C)) 和错误折叠,聚合形式.
- β2-α2循环区域 (残留165-175) 参与了转化过程.
- 了解循环动力学对于病机制至关重要.
研究的目的:
- 为了研究质蛋白的β2-α2循环的结构转变.
- 为了确定野生类型和突变的蛋白质中循环过渡的能量格局.
- 阐明铁素169在稳定原生蛋白形状中的作用.
主要方法:
- 一个Y169G单点突变蛋白的无偏向分子动力学模拟.
- 从模拟中采用多重构造的自由能量表面采样.
- 通过两种不同的计算方法确定自由能量概况.
主要成果:
- Y169G突变显著降低了从310螺旋转向β转向的β2-α2循环过渡的能量屏障,约2.5kcal/mol.
- 在Y169和F175之间有利的芳香环堆叠,以及在Y169和D178之间稳定的键稳定了野生型310螺旋形状.
- 循环过渡到β转暴露了一个疏水区域 (残留物169-YSNQNNF-175) 溶剂.
结论:
- 在残留169 (Y169) 中保存的氨酸在稳定哺乳动物蛋白的β2-α2循环中的310螺旋转中发挥着关键作用.
- 这种由Y169的稳定性积极地阻碍了循环向β转的过渡,从而防止采用趋于聚合的形状.
- 这些发现为蛋白转化和聚合的结构决定因素提供了分子洞察力.
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