核酸アプタメールによるリガンド結合のフッ素分解
Edward J Merino1, Kevin M Weeks
1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, USA.
Journal of the American Chemical Society
|October 9, 2003
まとめ
研究者らは,ATP結合アプタマーを用いた新しい光センサーを開発した. このアプタメアは,光の変化によってアデノシン三リン酸 (ATP) を検出し,新しいバイオセンシングアプローチを提供します.
科学分野:
- バイオケミストリー バイオケミストリー
- アナリティカル・ケミストリー (Analytical Chemistry) とは
- 分子生物学は分子生物学である.
背景:
- 核酸アプタマーは,特定の結合能力を持つ多用途の分子です.
- 敏感で選択的なバイオセンサの開発は,さまざまなアプリケーションにとって非常に重要です.
- アプタメルのリガンド誘発の構成変化は,センシングのために利用できます.
研究 の 目的:
- ATP結合アプタマーを使用して溶液相光検知センサーを作成する.
- 2'-アミン群をリガンド感受性フッ素反応に使用する.
- アデノシントリフォスファート (ATP) の検出におけるセンサーの機能を実証する.
主な方法:
- 2'-アミン群をATP結合アプタマーに組み込む.
- 2'-アミンのフローレスカミンとの反応により,光製品が生成される.
- 束縛されたフッ素 (615 nmで放射する) にエネルギー転送による光の検出.
- ATPの存在と欠如における光変化のモニタリング.
主要な成果:
- 改変したアプタメルは,フローレスカミンとの反応で光信号を生成した.
- ATPの存在は,フッ素反応を著しく減少させた.
- センサーは,簡素化された条件と尿の背景の両方で機能性を実証しました.
結論:
- フロロロゲン化学は,アプタマーベースのセンサーを開発するための一般的な戦略を提供します.
- 開発されたセンサーは,リガンド誘発の構造変化によってATPに敏感です.
- このアプローチは,新しいバイオセンサを作成するための有望な方法を提供します.
関連する概念動画
01:15Nucleophilic Acyl Substitution of Carboxylic Acid Derivatives
Nucleophilic acyl substitution is an important class of substitution reactions involving a nucleophile and an acyl compound, such as carboxylic acids and their derivatives. In these reactions, the leaving group attached to the acyl group is substituted by a nucleophile. The general mechanism proceeds via two steps.
01:01Acid Halides to Carboxylic Acids: Hydrolysis
Hydrolysis of acid halides is a nucleophilic acyl substitution reaction in which acid halides react with water to give carboxylic acids. The reaction occurs readily and does not require acid or a base catalyst.
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
As shown below, the mechanism involves a nucleophilic attack by water at the carbonyl carbon to form a tetrahedral intermediate. This is followed by the reformation of the carbon–oxygen π bond along with the departure of a halide ion. A final proton transfer step yields carboxylic acid...
01:07Acid Halides to Amides: Aminolysis
Aminolysis is a nucleophilic acyl substitution reaction, where ammonia or amines act as nucleophiles to give the substitution product. Acid halides react with ammonia, primary amines, and secondary amines to yield primary, secondary, and tertiary amides, respectively.
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
In the first step of the aminolysis mechanism, the amine attacks the carbonyl carbon of the acyl chloride to form a tetrahedral intermediate. In the second step, the carbonyl group is re-formed with the elimination of a chloride...
01:28Amides to Carboxylic Acids: Hydrolysis
Amides can undergo either acid-catalyzed hydrolysis or base-promoted hydrolysis through a typical nucleophilic acyl substitution. Each hydrolysis requires severe conditions.
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
Acid-catalyzed hydrolysis:
Hydrolysis of amides under acidic conditions yields carboxylic acids. Since the reaction occurs slowly, hydrolysis requires the conditions of heat.
The mechanism begins with the protonation of the carbonyl oxygen by the acid catalyst. The protonation makes the amide carbonyl carbon more...
01:08Nitriles to Carboxylic Acids: Hydrolysis
Nitriles undergo acid-catalyzed hydrolysis or base-catalyzed hydrolysis to form a carboxylic acid. These reactions proceed via an amide intermediate.
01:04¹³C NMR: ¹H–¹³C Decoupling
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...