関連する実験動画
Updated: Jul 27, 2026

09:45
Modification and Functionalization of the Guanidine Group by Tailor-made Precursors
Published on: April 27, 2017
化学的補足によるグリコシンタゼの方向進化
Hening Lin1, Haiyan Tao, Virginia W Cornish
1Department of Chemistry, Columbia University, New York, New York 10027, USA.
Journal of the American Chemical Society
|November 19, 2004
まとめ
酵素の進化を促進するために,酵母三種ハイブリッドアッセイであるChemical Complementationを開発しました. この方法により,グリコシンタゼの活性が改善され,炭水化物活性酵素の誘導進化における有用性が実証されました.
科学分野:
- バイオケミストリー バイオケミストリー
- 酵素学 酵素学とは
- 合成生物学 合成生物学とは
背景:
- 酵素触媒は,炭水化物の合成に不可欠です.
- 誘導進化は,酵素変異をスクリーニングするために,堅実なアッセイを必要とします.
- 化学的補足は酵素進化のための新しい酵母3ハイブリッドアッセイです.
研究 の 目的:
- 化学的補充をグリコシンタゼの指向的な進化に適用する.
- Humicola insolens Cel7B.から派生したグリコシンタゼの活性を増強する.
- 新しい酵素クラスの化学補充の汎用性を実証する.
主な方法:
- イースト3ハイブリッドアッセイ (Chemical Complementation) を利用しました.
- Cel7B E197A変異体のグリコシンタゼ活性が,LEU2レポーター遺伝子と結びついている.
- Glu197の位置で飽和変異を起こし,活性を改善するために選択しました.
主要な成果:
- LEU2レポーターを通じて,細胞成長とグリコシンタゼ活性を成功裏に結び付けました.
- グライコシンタゼ活性が5倍に増加したCel7B E197Sの変種を分離しました.
- グライコシンタゼの進化のための効果的なプラットフォームとしての検証された化学補充.
結論:
- Chemical Complementationは,グリコシンタゼのダイレクトされた進化のための汎用性のあるプラットフォームです.
- この測定は,炭水化物の合成のための強化された酵素の発見を容易にする.
- このアプローチは一般的で,他の酵素ファミリーや反応にも簡単に適応できます.
関連する概念動画
Chemical and Solubility Equilibria
The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place, the Gibbs energy change must be...
Acid Halides to Alcohols: Grignard Reaction
Organomagnesium halides, commonly known as Grignard reagents, convert acid halides to tertiary alcohols. The reaction requires two equivalents of the Grignard reagent and proceeds via a ketone intermediate.
Grignard reagents are a source of carbanions and function as nucleophiles. The mechanism begins with the nucleophilic attack by the carbanion at the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs,...
Grignard reagents are a source of carbanions and function as nucleophiles. The mechanism begins with the nucleophilic attack by the carbanion at the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs,...
Introduction to Chemical Reactions
All chemical reactions begin with a reactant, the general term for one or more substances entering the reaction. Sodium and chloride ions, for example, are the reactants in the production of table salt. One or more substances produced by a chemical reaction are called the product. Chemical reactions follow the law of conservation of mass, which means that matter cannot be created nor destroyed in a chemical reaction. The components of the reactants—the number of atoms and the elements—are all...
Types of Chemical Reactions: Exchange and Reversible
An exchange reaction is a chemical reaction in which both synthesis and decomposition occur, chemical bonds are both formed and broken, and chemical energy is absorbed, stored, and released.
A special kind of exchange reaction is the oxidation-reduction reaction, or the redox reaction. These reactions involve the transfer of electrons from one compound to another. The electrons in these reactions commonly come from hydrogen atoms, which consist of an electron and a proton. A molecule gives up a...
A special kind of exchange reaction is the oxidation-reduction reaction, or the redox reaction. These reactions involve the transfer of electrons from one compound to another. The electrons in these reactions commonly come from hydrogen atoms, which consist of an electron and a proton. A molecule gives up a...
Effects of Chemicals: Overview
Drugs, encompassing various chemical compounds from natural sources, lab synthesis, or genetic engineering, elicit different biological responses in living organisms. Some of these responses are desirable or therapeutic, while others are undesirable. The primary goal of administering a drug is to achieve a therapeutic effect, that is, to address a specific disease or health condition. Any concurrent effects outside of this therapeutic outcome are considered undesirable. These undesirable...
Production of Pharmaceuticals
Industrial insulin production uses genetically engineered E. coli expressing a proinsulin gene controlled by a tryptophan promoter and containing a methionine linker for later cleavage. The cells also carry ampicillin resistance for selective growth. Seed cultures are stored at −80 °C and production begins by thawing a small amount to inoculate starter cultures, which are progressively scaled to a 50,000-L bioreactor. In the bioreactor, E. coli grow in nutrient-rich media under sterile, tightly...

