在新合成的多域蛋白中协调的非向量折叠
Annemieke Jansens1, Esther van Duijn, Ineke Braakman
1Department of Bio-Organic Chemistry 1, Bijvoet Center for Biomolecular Research, University of Utrecht, Padualaan 8, 3584 CH Utrecht, Netherlands.
概括
新合成的低密度脂蛋白受体 (LDL-R) 分子通过崩的中间体在翻译后折叠. 这个过程涉及短暂的,长距离的二硫化物键,后者被异构化成原生对,挑战了矢量折叠假设.
科学领域:
- 蛋白质折叠过程中的蛋白质折叠
- 分子生物学分子生物学
- 细胞过程是细胞的过程.
背景情况:
- 低密度脂蛋白受体 (LDL-R) 是一种多域蛋白.
- 在体内这种蛋白质的折叠通常被认为是矢量性的,从氨基末端继续到碳盒末端.
研究的目的:
- 为了研究LDL-R的体内折叠路径.
- 为了确定LDL-R折叠是否发生矢量或通过其他机制.
主要方法:
- 用完整的细胞进行脉冲追踪实验.
- 分析的重点是LDL-R合成和折叠期间的形状变化和二硫化键形成.
主要成果:
- 新合成的LDL-R分子通过"崩"的中间体折叠.
- 这些中间体含有非原生二硫化物键,将遥远的氨酸残留物连接起来.
- 氨基终端域在折叠过程的晚期采用其原生构造,而不是在初始合成期间.
结论:
- 细胞中的生产性LDL-R折叠主要是翻译后的事件,而不是严格的矢量.
- 折叠途径涉及短暂的,远程的非原生二硫化物键.
- 这些非原生键随后被异构化成原生,短距离的氨酸对.
相关概念视频
Protein Organization
Overview
Protein Folding
Overview
Protein Organization
Overview
Protein Organization
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
The primary structure of a protein is its amino acid sequence.
Protein Folding
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...
Protein Organization
Proteins are polymers of amino acid residues. They are versatile and responsible for different cellular functions, including DNA replication, molecular transport, catalysis, and structural support. Proteins have a hierarchical structure comprising at least three levels of organization: primary, secondary, and tertiary structure. Some large proteins have a quaternary structure where individual protein subunits are linked together.
The primary structure of a protein is its amino acid sequence.
The primary structure of a protein is its amino acid sequence.


