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相关概念视频

Protein Folding01:25

Protein Folding

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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...
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Molecular Chaperones and Protein Folding03:00

Molecular Chaperones and Protein Folding

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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...
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Deciphering the intermolecular interactions between G-quadruplex (G4)-forming sequences.

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相关实验视频

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Single-molecule Manipulation of G-quadruplexes by Magnetic Tweezers
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在G-四倍折叠的早期事件被时间分辨率小角度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.

bioRxiv : the preprint server for biology
|September 16, 2024
PubMed
概括
此摘要是机器生成的。

快速崩,就像蛋白质化球体的形成一样,先于G-四倍折叠. 寡核酸G4折叠的这个早期阶段发生在600 ms以下.

关键词:
在G-quadruplex中使用.端粒折叠 端粒的折叠时间解决的SAXS.

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Single-Molecule Fluorescence Visualization of DNA Polymerase Dynamics at G-Quadruplexes
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Author Spotlight: Characterizing DNA G-Quadruplex by Bis-3-Chloropiperidine Based Chemical Mapping
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相关实验视频

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科学领域:

  • 生物物理学的生物物理.
  • 结构生物学 结构生物学
  • 分子生物学分子生物学

背景情况:

  • 在端粒维护和基因调节中,G-四重复 (G4) 结构至关重要.
  • 了解G-四重复的折叠路径是阐明它们的生物功能的关键.

研究的目的:

  • 为了研究混合1和混合2端粒G-四重复结构的早期折叠动态.
  • 用时间解析实验来描述G4形成期间的快速结构变化.

主要方法:

  • 时间分辨小角度X射线散射 (TR-SAXS) 以实时监测结构变化.
  • 为了启动和跟踪折叠,进行pH跳跃动态研究.
  • SAXS 集合优化方法 (EOM) 用于模拟展开状态.

主要成果:

  • 观察到未折叠的寡核酸的快速单相崩,在<600 ms内完成.
  • 在这个崩过程中,旋转半径从20.6减至12.6 Å.
  • 萨克斯EOM分析揭示了展开状态作为一个动态的组合与短暂的针头结构.
  • 均衡研究证实在性pH下完全G4展开,但在LiCl中没有.

结论:

  • G-四倍折叠涉及最初的快速崩,类似于蛋白质中化球体的形成.
  • 这种崩接着是构造性搜索,导致本地G4接触的形成.
  • 这些发现为G4折叠路径和展开状态的性质提供了新的见解.