让蛋白质变得不显眼地光:基因编码的4-酸维护了它们的结构,并使得可以检测到连接物结合点
Haocheng Qianzhu1, Elwy H Abdelkader2, Adarshi P Welegedara2
1Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.
Angewandte Chemie (International ed. in English)
|December 4, 2024
概括
二托 (CN-Trp) 是一种多功能蛋白质标签. 4-CN-Trp的特定位点内置使敏感的光检测能够用于研究蛋白质结构和连接体结合.
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:
- 类类 (CN-Trp) 是用于蛋白质结构分析的多模式记者.
- 它们在结构上与托芬相似,具有对环境敏感的光.
- 特定的氨基酸-tRNA合成酶在体内促进蛋白质的生产,具有特定的CN-Trp结合.
研究的目的:
- 开发和表征二托芬作为特定位置的蛋白质标签.
- 为了证明4-二托 (4-CN-Trp) 在体内蛋白质生产和结构研究中的实用性.
- 展示4-CN-Trp在测量配体结合亲和度和绘制蛋白质-配体相互作用中的应用.
主要方法:
- 选择氨基酸-tRNA合成酶以结合4-,5-,6-和7-CN-Trp.
- 在体内生产高产量的蛋白质,具有特定地点的酸标签.
- 用4-CN-Trp替代确定马尔托结合蛋白的晶体结构.
- 光谱法用于测量连接体结合亲和力和光火实验.
主要成果:
- 在体内表现出高收益的蛋白质生产与特定地点的CN-Trp.
- 在用4-CN-Trp替代托时,晶体结构显示出几乎完全的结构保护.
- 4-CN-Trp表现出强烈的光,使得可以测量亚纳米分子联体结合.
- 光灭成功地检测出托残留物与连接物结合部位的接近性.
结论:
- 4-CN-Trp作为蛋白质结构和动态研究的有效和不显眼的标签.
- 它的强烈光和环境敏感性允许对分子相互作用进行敏感检测.
- 4-CN-Trp是活细胞显微镜和定量生化分析的宝贵工具.
相关概念视频
Conserved Binding Sites
4.2K
Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
4.2K
From DNA to Protein
18.0K
The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
18.0K
Ligand Binding Sites
12.7K
Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
12.7K
Tagging and Fusion Proteins
6.6K
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...
6.6K
Protein Dynamics in Living Cells
2.1K
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...
2.1K


