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関連する概念動画

Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

3.9K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
3.9K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

6.7K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
6.7K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.6K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.6K
SN2 Reaction: Stereochemistry02:23

SN2 Reaction: Stereochemistry

13.2K
In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
If the substrate is an achiral molecule at the α-carbon, the inversion of configuration is not...
13.2K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

3.1K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
3.1K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.7K
The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
2.7K

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Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
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ポリケチド合成酵素の触媒における基質制御による微分.

Douglas A Hansen, Aaron A Koch, David H Sherman

    Journal of the American Chemical Society
    |March 3, 2015
    PubMed
    まとめ
    この要約は機械生成です。

    研究者は,ポリケチド合成酵素 (PKSs) を制御するために合成基板を設計しました. この基板工学のアプローチは,PKS触媒を正確に誘導し,バイオカタリシスに必要なマクロラクトン製品の選択的生産を可能にしました.

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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
    • 合成生物学 合成生物学とは
    • 酵素学 酵素学とは

    背景:

    • ポリケチド合成酵素 (PKSs) は,天然製品の生物合成において重要な酵素である.
    • PKSを特徴付けるには,伝統的に合成のN-アセチルシステアミンチオエスターを使用しています.
    • 基板工学によるPKSの触媒サイクルを制御することは,十分に研究されていない.

    研究 の 目的:

    • PKSモジュールの触媒的結果を制御するための基板工学を調査する.
    • 代替的に活性化されたネイティブヘキサケチド基板がPikAIV触媒に与える影響を調べる.

    主な方法:

    • 代替的に活性化されたネイティブヘキサケチド基板のシリーズを使用した.
    • ピクロミシン経路からのPKSモジュールであるPikAIVの触媒的結果を調べました.
    • 基質の改変に基づいて分析された製品形成.

    主要な成果:

    • エンジニアリングされた基板を使用してPKS触媒に対する選択的制御が実証されています.
    • 全モジュールの触媒 (14基マクロラクトン) または直接サイクリング (12基環) のいずれかの場合,10:1以上の選択性を達成しました.
    • PKSの機能研究のための実行可能な戦略として,基板工学を展示しました.

    結論:

    • サブストラット工学は,PKSの触媒経路を誘導するための強力なツールを提供します.
    • 修正されたヘキサケチドエステルは,PKSバイオカタリシスにおける製品形成の正確な制御を可能にします.
    • このアプローチにより,PKS酵素の機能的理解と応用が進んでいます.