一种通用和高效的方法,用于单分子光共振能量转移的蛋白质的特定位置的双重标记
Eric M Brustad1, Edward A Lemke, Peter G Schultz
1Department of Molecular Biology, Department 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 26, 2008
概括
研究人员开发了一种使用非自然氨基酸和光体的新方法,用于特定区域的蛋白质标签. 这种技术可以在单个分子水平上对蛋白质折叠动态进行高分辨率研究.
科学领域:
- 生物化学 生物化学
- 生物物理学的生物物理.
- 分子生物学分子生物学
背景情况:
- 单分子光共振能量转移 (smFRET) 对于研究蛋白质动力学至关重要.
- 特定地点的标签对于准确的smFRET测量至关重要.
- 目前的标签方法在范围和效率上可能受到限制.
研究的目的:
- 提出针对特定地点的蛋白质双重标记的总体策略.
- 为了使蛋白质折叠和动态的高分辨率研究.
- 扩大单分子生物物理技术的能力.
主要方法:
- 基因编码一种非自然的氨基酸变成蛋白质.
- 将非自然氨基酸标记为含有基胺的化物.
- 为实验验证构建双标记的T4溶酶变体.
主要成果:
- 实现了特定地点的双重标签,高产量 (>95%) 和特异性.
- 在单分子研究中成功生成双标记的T4溶酶.
- 证明了该方法用于研究蛋白质折叠的实用性.
结论:
- 提出的策略为蛋白质标签提供了一种多功能方法.
- 这种方法增强了单分子水平上蛋白质结构和功能的研究.
- 预计该技术将扩大smFRET在生物物理学和生物化学中的应用.
相关概念视频
Protein Dynamics in Living Cells
Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Tagging and Fusion Proteins
Proteins are involved in several cellular processes and biochemical reactions. Analyzing a specific protein of interest requires it to be isolated from the other proteins in the cell. This is achieved by overexpressing the specific gene in a suitable host to produce large quantities of the target protein. A tag or label is recombined with the gene to produce a fusion protein containing the target protein and the tag. The tags on these fusion proteins can then be used for easy detection and...


