染色体折叠体的折叠和展开显示了不寻常的彩色单分子光谱动态
Jason J Han1, Wei Wang, Alexander D Q Li
1Department of Chemistry, Washington State University, Pullman, Washington 99164, USA.
Journal of the American Chemical Society
|January 19, 2006
概括
多染色体折叠体表现出动态的光谱变化,由于光诱导的展开和折叠. 这些动态揭示了折叠和展开状态之间的多个路径,受色素体相互作用的影响.
科学领域:
- 超分子化学 超分子化学
- 光物理学的光学物理学
- 聚合物科学 聚合物科学
背景情况:
- 折叠分子是合成的小聚体,模仿蛋白质的二次结构.
- 烯染色体为分子研究提供独特的光物理性质.
- 乙烯基醇链在折叠机架构中提供了灵活性.
研究的目的:
- 为了研究多染色体折叠体的光物理行为.
- 探索折叠体结构和光谱动态之间的关系.
- 了解单个分子层面上的折叠-展开机制.
主要方法:
- 使用单分子光光谱学.
- 合成了带有交替烯染色体和乙烯糖醇链的线性折叠体.
- 分析了单体,三体和六体折叠体的光谱轨迹.
主要成果:
- 单体显示了最小的光谱波动.
- 三度和六度表现出复杂的光谱动态,表明光诱导的展开/折叠.
- 与pi-pi相互作用和折叠状态相关的光谱形状,从展开 (绿色辐射) 到折叠 (红色辐射).
结论:
- 折叠机动力学是由随机光学诱导的展开和折叠驱动的.
- 在折叠和展开状态之间存在多个路径,由切换速率证明.
- 染色体pi-pi相互作用的程度决定了观察到的光谱特征.
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