Endo-Functionalized Porous Capsuleの複数のアクティブサイトを同時にアップレギュレーションすることによって増幅された速度加速
Sivil Kopilevich1, Achim Müller2, Ira A Weinstock1
1Department of Chemistry, Ben Gurion University of the Negev , Beer Sheva 84105, Israel.
Journal of the American Chemical Society
|September 11, 2015
まとめ
この研究は,多孔性カプセル内の複数の活性部位が反応を加速し,酵素のような速度を達成することを示しています. カプセルを修正する
科学分野:
- 超分子化学
- キャタリシス
- 材料科学
背景:
- 毛細なカプセルは,触媒反応のための基板をカプセル化することができます.
- 狭い空間内の触媒部位の活動が注目される分野です.
研究 の 目的:
- 多数の活性部位が有毛なカプセル内の反応速度の加速に及ぼす影響を調査する.
- 合成触媒システムでミカエリス・メンテン適合運動を実証する.
主な方法:
- 水中のエポキシドの水解をモデル反応として利用する.
- 水溶性Ih対称性ケプレラート型ポリオキシメタラート複合体を多孔性カプセルとして使用する.
- ディモリブデン部位を活性化するために,ブロックリガンドを除去することによってカプセルを修正する.
主要な成果:
- 改造されたカプセルは,基板ゲストの封じ込みを増加させた.
- ダイモリブデン部位の活性化により,有効なモラリティが著しく増加した.
- 速度加速 (k ((cat) /k ((uncat)) は 16,000 から 182,800 に増加し,酵素のような値に達しました.
結論:
- 多孔性カプセル内の複数の活性サイトは,触媒速度を大幅に高めることができます.
- ケプレラート型カプセルは,リガンド改変によって調整可能な活性を示しています.
- このシステムは,高い触媒効率を持つ人工酵素を設計するためのモデルを提供します.
関連する概念動画
Feedback Regulation of Calcium Concentration
4.2K
Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
4.2K
ATP Driven Pumps I: An Overview
10.5K
ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
10.5K
Modified-Release Drug Delivery Systems: Stimuli-Activated
118
Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also...
118
Receptor-mediated Endocytosis
11.8K
Receptor-mediated endocytosis is when bulk amounts of specific molecules are imported into a cell after binding to cell surface receptors. The molecules bound to these receptors are taken into the cell through inward folding of the cell surface membrane, which is eventually pinched off into a vesicle within the cell. Structural proteins, such as clathrin, coat the budding vesicle.
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
Clathrin-Mediated Endocytosis of LDL
One well-characterized example of receptor-mediated endocytosis is the...
11.8K
Receptor-mediated Endocytosis
113.5K
Overview
113.5K
Enzymes
97.2K
Inside living organisms, enzymes act as catalysts for many biochemical reactions involved in cellular metabolism. The role of enzymes is to reduce the activation energies of biochemical reactions by forming complexes with its substrates. The lowering of activation energies favor an increase in the rates of biochemical reactions.
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
Enzyme deficiencies can often translate into life-threatening diseases. For example, a genetic abnormality resulting in the deficiency of the enzyme G6PD...
97.2K


