全球紧缩对折叠树枝状分子局部次要结构的影响
Baohua Huang1, Matthew A Prantil, Terry L Gustafson
1Department of Chemistry, The Ohio State University, Columbus, OH 43210, USA.
Journal of the American Chemical Society
|November 20, 2003
概括
树突凝结的性质,而不仅仅是它的范围,显著影响了局部螺旋结构. 这一发现对于了解分子形状如何影响折叠树枝状物中的二次结构偏好至关重要.
科学领域:
- 聚合物化学 聚合物化学
- 超分子化学 超分子化学
- 材料科学 材料科学 材料科学
背景情况:
- 体是高度分支的大分子,具有独特的结构性质.
- 了解全球结构和局部构造之间的关系是设计功能树枝状体的关键.
- 非局部相互作用可以显著影响树枝状体的结构性行为.
研究的目的:
- 研究非局部相互作用对折叠树枝状体局部结构倾向的影响.
- 为了比较同位体树枝状体的构造性质与不同的全球包装效率.
- 确定树突凝结在二次结构偏好中的作用.
主要方法:
- 树突体的模块化合成,直到第三代.
- 时间分辨的光异构度 (TRFA) 测量以确定水力动力学体积.
- 循环二重化 (CD) 光谱法用于评估局部螺旋偏差.
- 使用水力动力体积与范德瓦尔斯体积的比率 (V (h) /V (v)) 估计包装效率.
主要成果:
- 成功合成了两系列具有不同紧缩度的同位素树突分子.
- 测量了水力动力体积和包装效率 (V(h) /V(vw)) 并与生成和溶剂相关联.
- 使用CD光谱学量化了局部螺旋偏差,发现它取决于包装效率.
- 发现压缩的性质 (例如,连接类型) 比对二次结构的压缩程度更有影响.
结论:
- 树突凝结在决定二次结构偏好的过程中起着至关重要的作用.
- 构成树突细胞核的连接的特异性对其构造和局部结构产生重大影响.
- 这些发现提供了关于树枝状体的合理设计的见解,具有受控的结构和功能性质.
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