从二次结构元素库中选择折叠的蛋白质
James J Graziano1, Wenshe Liu, Roshan Perera
1Department of Chemistry and the Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA.
Journal of the American Chemical Society
|December 11, 2007
概括
研究人员开发了一种新的蛋白质进化策略,以创建新的多. 这种方法成功地产生了具有定义的二次结构的可溶性蛋白质,其中一些没有已知的同质性.
科学领域:
- 蛋白质工程是指蛋白质工程.
- 合成生物学 合成生物学
- 生物化学 生物化学
背景情况:
- 设计具有特定结构和功能的新型蛋白质是蛋白质工程的一个关键挑战.
- 了解序列,结构和稳定性之间的关系对于新的蛋白质设计至关重要.
研究的目的:
- 开发和验证一种蛋白质进化策略,用于产生具有定义二次结构的新型多.
- 创建一个新的蛋白质序列的图书馆,并在体内识别可溶,稳定的变体.
主要方法:
- 将编码大肠杆菌二次结构元素 (α螺旋,β链,循环) 的双链DNA片段组合成半随机序列.
- 将生成的聚类图书馆插入增强的绿色光蛋白 (EGFP) 融合载体中.
- 使用光激活细胞分类 (FACS) 选图书馆成员,并通过数字PCR (dPCR) 进行可溶性克隆的表征.
主要成果:
- 创建并选了一套新型多的库,从大约10^8个克隆中产生了1149个高光殖民地.
- 确定了四种具有不同二次结构的可溶性克隆,包括一种同类于海洋酸盐种族酶的克隆,以及其他没有已知的序列同质性的克隆.
- 选择的新型多呈现出显著的α-螺旋含量,可逆折叠和pH敏感结合,表明稳定,结构化的蛋白质.
结论:
- 描述的蛋白质进化策略在生成具有可预测的二次结构的新型多序列方面是有效的.
- 这种方法可以产生可溶和稳定的蛋白质,包括那些与现有的蛋白质数据库没有同质性的蛋白质.
- 鉴定到的新型多是进一步功能表征和生物技术应用的有希望的候选者.
相关概念视频
Protein Folding
Overview
Protein Folding
Overview
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...
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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...
The...
Molecular Chaperones and Protein Folding
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...
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.


