对于氨基酸残留的上下文独立,温度依赖的螺旋倾向
Robert J Moreau1, Christian R Schubert, Khaled A Nasr
1Department of Chemistry, Room 6-433, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Journal of the American Chemical Society
|August 26, 2009
概括
这项研究量化了氨基酸螺旋倾向,揭示了它们形成蛋白质螺旋的倾向的温度依赖变化. 这些发现对于在不同温度环境中准确建模蛋白质至关重要.
科学领域:
- 生物化学 生物化学
- 结构生物学 结构生物学
- 蛋白质折叠 蛋白质的折叠
背景情况:
- 蛋白质的二次结构,特别是α螺旋,对蛋白质的功能至关重要.
- 了解影响螺旋体形成的因素,如氨基酸序列和温度,对于预测蛋白质结构和稳定性至关重要.
研究的目的:
- 确定20种基因编码的氨基酸加上诺瓦林和诺卢的温度依赖的螺旋倾向.
- 为准确建模适应各种温度的生物中的蛋白质结构提供定量数据.
主要方法:
- 合成基于聚氨酸的宿主,其中包含特定的氨基酸残留.
- 在2,25和60摄氏度的水溶液中测量 (13)C=O NMR化学转移和[theta](222) 圆度.
- 相对于氨酸的螺旋倾向值 (DeltaDeltaG) 的计算.
主要成果:
- 氨基酸的螺旋倾向排名因温度而异,在2°C和60°C观察到不同的顺序.
- 在低温下被确定为螺旋突破剂的氨基酸在高温下显示减弱的断裂倾向.
- 与圆性数据相比,NMR化学转移提供了更精确和准确的螺旋性赋值.
结论:
- 精确建模状蛋白质需要温度匹配的氨基酸倾向集.
- 这项研究为研究人员研究热友,中友和精神友的蛋白质结构功能关系提供了宝贵的资源.
- 这些发现强调了在蛋白质结构预测中考虑温度等环境因素的重要性.
相关概念视频
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 Folding
Overview
Protein Folding
Overview
Amino acids
Amino acids are the monomers that comprise proteins. Each amino acid has the same fundamental structure, which consists of a central carbon atom, or the alpha (α) carbon, bonded to an amino group (NH2), a carboxyl group (COOH), and to a hydrogen atom. Every amino acid also has another atom or group of atoms bonded to the central atom known as the R group. There are 20 common amino acids present in proteins, each with a different R group. Variation in the amino acid sequence is responsible for...


