相关实验视频

Updated: May 2, 2026

Expression, Purification, Crystallization, and Enzyme Assays of Fumarylacetoacetate Hydrolase Domain-Containing Proteins

Expression, Purification, Crystallization, and Enzyme Assays of Fumarylacetoacetate Hydrolase Domain-Containing Proteins

Published on: June 20, 2019

通过结晶学和染色学合的小角度X射线散射来表征的氨酸氧酶激活时的域移动

Steve P Meisburger¹, Alexander B Taylor², Crystal A Khan²

¹Department of Chemistry, Princeton University , Princeton, New Jersey 08544, United States.

Journal of the American Chemical Society

|May 5, 2016

概括

已经阐明了哺乳动物氨酸化酶 (PheH) 的全激活机制. 氨酸结合稳定了调节域,暴露了活性部位的氨酸产生,这对于预防氨酸尿症至关重要.

科学领域:

生物化学
结构生物学
酵素学

背景情况:

哺乳动物氨酸氧酶 (PheH) 调节氨酸的代谢.
基激活是PheH功能的关键,它将氨酸转化为氨酸.
氨酸代谢的失调会导致氨酸尿,导致智力障碍.

研究的目的:

研究哺乳动物PheH中全激活的结构机制.
要了解氨酸结合如何诱导酶活性的构造变化.

主要方法:

进行X射线晶体检查以确定PheH结构.
异热定位热量计 (ITC) 用于研究结合相互作用.
小角度X射线散射 (SAXS) 来分析溶液结构和域移动.
染色学合SAXS与演变因子分析 (EFA) 进行组件分离.

主要成果:

晶体结构显示了预激活的PheH四聚合物,其对接的调节域阻碍了基质的接入.
SAXS 显示了与溶液中的全激活相关的域移动.
该研究表明SAXS-EFA用于分析复杂散射数据的新应用.

结论:

氨酸结合稳定了调节域二元化,促进了活性部位的暴露.
这种机制解释了PheH全调节及其在防止氨酸积累方面的作用.
这些发现提供了关于PheH功能和基病因的结构性见解.

更多相关视频

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050

X-Ray Crystallography to Study the Oligomeric State Transition of the Thermotoga maritima M42 Aminopeptidase TmPep1050

Published on: May 13, 2020

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase

PCR Mutagenesis, Cloning, Expression, Fast Protein Purification Protocols and Crystallization of the Wild Type and Mutant Forms of Tryptophan Synthase

Published on: September 26, 2020

相关概念视频

Protein Dynamics in Living Cells

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...