在Q11自组装纳米纤维中检测到并行的β-板结构和结构异质性
Alicia S Robang1, Kong M Wong1, Johannes Leisen2
1School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.
The journal of physical chemistry. B
|May 24, 2024
概括
设计用于生物材料应用的Q11纳米纤维令人惊地组装成平行β片,而不是预期的反平行结构. 这项研究揭示了在分子水平上精确控制的自我组装方面的挑战.
科学领域:
- 生物材料科学 生物材料科学
- 分子生物物理学 分子生物物理学
- 体自组装器 自组装器
背景情况:
- Q11酸纳米纤维是用于抗原呈现和组织工程的生物材料.
- 之前对它们的分子层结构的了解是有限的.
- Q11序列的设计是为了使用疏水/极性氨基酸模式形成反平行β片.
研究的目的:
- 为了研究自组装Q11纳米纤维的分子组织.
- 为了确定分子结构是否符合设计对反平行β片的预期.
- 评估基于启发式设计在控制组合方面的有效性.
主要方法:
- 固态核磁共振 (NMR) 光谱是主要的技术.
- 使用二维 (2D) C-C双极辅助旋转共振 (DARR) 来评估空间近距离.
- 频率选择性旋转回声双共振 (fsREDOR) 和C PITHIRDS-CT双极再合被用于分析β片排列.
主要成果:
- Q11纳米纤维具有结构异质性,形成分子结构的分布.
- 与设计相反,主要结构由平行β片组成,而不是反平行.
- 大约9%的残留物 (K3和E9) 显示出接近,表明盐桥形成,而22%的β-链具有反平行邻居.
结论:
- 基于启发式设计的设计可以促进β-sheet的形成,但在精确控制β-strand排列方面存在困难.
- 固态NMR显示了Q11纳米纤维中意想不到的平行β片组装.
- 设计特定的体自我组装结构仍然是一个重大挑战.
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