フェノール誘導体を用いたN-ターミナルプロリン残基の酵素改変
Johnathan C Maza1, Daniel L V Bader1, Lifeng Xiao1
1Department of Chemistry , University of California , Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|February 7, 2019
まとめ
新しい酵素法では,Agaricus bisporus tyrosinase (abTYR) を用いて,タンパク質のN端のプロリン残基を修正する. この生物結合戦略は,様々な分子をタンパク質に結合させるための温和な条件と高収量を提供します.
科学分野:
- 生物化学
- 酵素学
- タンパク質工学
背景:
- 新しい生化学的ツールや治療法の開発には タンパク質の改良が不可欠です
- サイト特有のタンパク質の改変には,複雑な化学戦略や工学的な酵素が必要である.
- N端のプロリン残基は,選択的生物結合のためのユニークな標的である.
研究 の 目的:
- タンパク質のN端プロリン残基を改変するための便利で効率的な酵素戦略を開発する.
- サイト固有のタンパク質の生物結合のために自然に発生する酵素を利用する.
- 様々なタンパク質の基板と荷物の分子を用いた方法の汎用性を実証する.
主な方法:
- Agaricus bisporus (abTYR) のチロシナーゼ酵素を用いてタンパク質を改変した.
- 分子酸素を用いた反応性オキノンの中間物質に酸化したフェノールとカテコール前駆体.
- タンパク質基板のN端プロリン残留物とオキノンの結合を容易にした.
主要な成果:
- フェノール誘導分子からN末端プロリンへの生物結合で高い収量を達成した.
- ウイルスのカプシド,酵素,キチン結合ドメイン (CBD) を含む多様なタンパク質基質の成功改変が実証された.
- タンパク質の機能 (例えば,CBDが酵母細胞に結合する) は,改変後も変化しないことが確認された.
結論:
- abTYR媒介の酵素戦略は,N末端プロリン改変のための軽い,効率的で多用途な方法を提供します.
- この生物結合アプローチは,すぐに利用可能な前駆物質と軽度の反応条件を使用します.
- この方法は大規模な用途に適しており,タンパク質の機能性を保ちます.
関連する概念動画
Histone Modification
16.1K
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone...
16.1K
Termination of Translation
27.7K
The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
27.7K
Termination of Translation
6.8K
6.8K
Residual Plots
6.5K
A residual plot is a statistical representation of data used to analyze correlation and regression results. It helps verify the requirements for drawing specific conclusions about correlation and regression. To obtain the residual plot, first, the residual for each data value is calculated, which is simply the vertical distance between the observed and the predicted value obtained from the regression equation.
When the residual values are plotted against the variable x, it is called a residual...
When the residual values are plotted against the variable x, it is called a residual...
6.5K
Residual Stresses
628
Residual stresses reside in a structure even after removing the original stress inducer. This phenomenon often arises from varied plastic deformations across different parts of a structure. Consider a rod stretched beyond its yield point. It will not regain its original length due to permanent deformation. Even after load removal, the rod does not entirely lose stress because of uneven plastic deformations, resulting in residual stresses. The computation of these stresses in structures is...
628
Spreading of Chromatin Modifications
9.5K
The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
The writer...
Writers
The writer...
9.5K


