在内在无序系统中识别残留结构:对GVGXPGVG的二维IR光谱研究
Joshua Lessing1, Santanu Roy, Mike Reppert
1Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States.
Journal of the American Chemical Society
|February 24, 2012
概括
在含有proline的中改变氨基酸侧链会显著改变它们的结构. 这项研究使用光谱和模拟量化了这些构造变化,揭示了不同的转变种群.
科学领域:
- 生物物理学的生物物理.
- 频谱学是一种光谱学.
- 计算化学计算化学
背景情况:
- 体结构对于功能至关重要.
- 在无序的蛋白质中,轮是常见的.
- 胺-I振动对形状敏感.
研究的目的:
- 为了研究氨基酸替代如何影响转结构.
- 为了描述GVGX(L) PGVG中的 conformational 集合.
- 为了将光谱数据与特定的转向类型相关联.
主要方法:
- 里埃变换红外光谱法 (FTIR) 光谱法
- 二维红外 (2D IR) 光谱学
- 分子动力学 (MD) 模拟
- 基于结构的光谱建模.
主要成果:
- 在X位点 (Gly,Ala,Val) 的侧链大小显著改变了形状.
- 光谱模型成功地分配了II型β转,凸起的转和不规则的β转的种群.
- 在弹性质中发现的Val变体,显示了25%的不规则β转的种群,具有与proline CO的特定气结合.
结论:
- 胺-I振动是一种对转向结构的敏感探针.
- 氨基酸侧链相互作用在决定形状方面发挥着关键作用.
- 该研究提供了序列,结构和光谱特征之间的定量联系.
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