相关实验视频
Updated: May 30, 2025

08:28
Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers
Published on: September 19, 2017
7.9K
在G-四倍折叠的早期事件被时间解析的小角度X射线散射捕获.
Robert C Monsen1, T Michael Sabo1, Robert Gray1
1Department of Medicine, UofL Health Brown Cancer Center, University of Louisville, Louisville KY, 505 S Hancock St, Louisville, KY 40202, United States.
Nucleic acids research
|January 30, 2025
概括
快速崩,类似于蛋白质化球体的形成,是G-四重复 (G4) 折叠的关键早期步骤. 这种崩发生在几毫秒内,先于较慢的折叠事件.
科学领域:
- 生物物理学的生物物理.
- 结构生物学 结构生物学
- 生物化学 生物化学
背景情况:
- G四复合体 (G4) 是关键的核酸结构,具有不同的生物作用.
- 了解G4折叠路径对于阐明它们的功能至关重要.
- 以前的模型缺乏对初始折叠动态的详细见解.
研究的目的:
- 为了研究混合1和混合2端粒G四重复的早期折叠事件.
- 测量G4折叠过程中的动力学和结构变化.
- 为了描述G-四重复的展开状态.
主要方法:
- 时间解析的小角度X射线散射 (SAXS) 实验.
- pH-跳跃开始折叠.
- 手动混合动力学研究.
- 萨克斯集团优化方法 (SAXS-EOM).
主要成果:
- 在600毫秒内观察到未折叠的G-四重复的快速单相崩.
- 崩显著减少了旋转半径,这表明了紧缩.
- 展开的状态存在于灵活的链条和短暂的针头的动态组合.
- 在性pH下G4的展开是完整的,但在LiCl溶液中没有.
结论:
- G-四倍折叠以快速崩开始,类似于蛋白质中化球体的形成.
- 随后的较慢的步骤包括在崩的结构中进行构造性搜索.
- 展开的状态不是一个随机的线圈,而是一个动态的整体.
- 已建立的G4展开条件需要重新评估.
相关概念视频
Protein Folding
7.7K
Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
7.7K
Molecular Chaperones and Protein Folding
17.7K
The native conformation of a protein is formed by interactions between the side chains of its constituent amino acids. When the amino acids cannot form these interactions, the protein cannot fold by itself and needs chaperones. Notably, chaperones do not relay any additional information required for the folding of polypeptides; the native conformation of a protein is determined solely by its amino acid sequence. Chaperones catalyze protein folding without being a part of the folded protein.
The...
The...
17.7K

