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関連する概念動画

Radical Formation: Abstraction00:47

Radical Formation: Abstraction

3.3K
The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
3.3K
Radical Formation: Elimination00:51

Radical Formation: Elimination

1.6K
Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions...
1.6K
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

3.6K
A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.
3.6K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.2K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.2K
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

1.4K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
1.4K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

1.6K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
1.6K

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関連する実験動画

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Monitoring Equilibrium Changes in RNA Structure by 'Peroxidative' and 'Oxidative' Hydroxyl Radical Footprinting
13:41

Monitoring Equilibrium Changes in RNA Structure by 'Peroxidative' and 'Oxidative' Hydroxyl Radical Footprinting

Published on: October 17, 2011

13.5K

BLUFドメイン関数は,メタステーブルなラジカル中間状態を必要としません.

Andras Lukacs1, Richard Brust, Allison Haigney

  • 1Department of Chemistry, Stony Brook University , Stony Brook, New York 11794-3400, United States.

Journal of the American Chemical Society
|March 4, 2014
PubMed
まとめ
この要約は機械生成です。

光誘発電子移転 (PET) は,フラビン (BLUF) タンパク質の機能を用いて青い光に中心的ではありません. 研究によると,ラジカル中間物質は観察されず,光活性と相関していないため,代替的な非ラジカル経路を示唆しています.

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development
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Free Radicals in Chemical Biology: from Chemical Behavior to Biomarker Development

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Last Updated: May 2, 2026

Monitoring Equilibrium Changes in RNA Structure by 'Peroxidative' and 'Oxidative' Hydroxyl Radical Footprinting
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Published on: October 17, 2011

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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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科学分野:

  • バイオケミストリー バイオケミストリー
  • フォトケミストリー フォトケミストリー
  • 分子生物学は分子生物学である.

背景:

  • フラビン (BLUF) タンパク質を用いた青光は,細胞内の重要な青光センサーである.
  • BLUFタンパク質における最初の光活性化段階は不明である.
  • タイロシンとフラビンを含む光誘発電子移転 (PET) は,提案されたメカニズムです.

研究 の 目的:

  • 3つのBLUFタンパク質の光サイクルにおけるPETの役割を調査する.
  • PETによって形成される中間基が,BLUFタンパク質の機能に不可欠であるかどうかを判断する.

主な方法:

  • 超高速ブロードバンドトランジント赤外線スペクトロスコーピーは,光化学的ダイナミクスを監視します.
  • サイト・ディレクテッド・ミュータゲネシスとイソトープ・ラベリングにより,中介的な基素を特定する.
  • 電子移転の原動力を変化させる非自然なアミノ酸変異.

主要な成果:

  • 研究された3つのBLUFタンパク質のうち2つにおいて,PETを示す中間基は一貫して観察されなかった.
  • 変異分析と同位体ラベリングにより,フラビンとタンパク質のラジカル状態の存在が確認されました.
  • 酸化チロロシン置換によるPETの原動力を変更すると,PETメカニズムと一致する結果が得られませんでした.

結論:

  • BLUFタンパク質に観察されたPET中介物質は,光活性と相関していません.
  • ラジカル中間物質は,BLUFタンパク質の動作メカニズムに中心的な役割を果たす可能性は低い.
  • ケトエノール・タウトメリゼーションなどのノンラジカル経路は,BLUFタンパク質の光活性化のための妥当な代替案です.