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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
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Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Balancing Redox Equations02:58

Balancing Redox Equations

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Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
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Coordination Number and Geometry02:57

Coordination Number and Geometry

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox Reactions01:27

Redox Reactions

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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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レドックス・スイッチブル・アロステリック・コーディネーション・コンプレックス

Ho Fung Cheng1, Andrea I d'Aquino1, Joaquín Barroso-Flores2

  • 1Department of Chemistry and International Institute for Nanotechnology , Northwestern University , 2145 Sheridan Road , Evanston , Illinois 60208-3113 , United States.

Journal of the American Chemical Society
|October 27, 2018
PubMed
まとめ
この要約は機械生成です。

研究者らは,リドックス交換可能なリガンドを備えた新しいプラチナ複合体を開発した. この分子ピンチシステムは 協調部位を電気化学的に制御し,高度なアプリケーションのために 4つの異なる状態を生み出します.

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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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Ion Mobility-Mass Spectrometry Techniques for Determining the Structure and Mechanisms of Metal Ion Recognition and Redox Activity of Metal Binding Oligopeptides
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科学分野:

  • 協調化学
  • 超分子化学
  • 電気化学

背景:

  • 調節可能な性質を持つ分子スイッチの開発は,先進的な材料にとって極めて重要です.
  • レドックス交換可能リガンドは,金属の複雑な構造を動的に制御するための経路を提供します.
  • 弱いリンクのアプローチは,複雑な分子構造の合成を可能にする.

研究 の 目的:

  • レドックス調節分子ピンチ複合体の合成と特徴付け
  • レドックス剤による調整部位アクセシビリティのアロステリック調節を調査する.
  • 複数の異なる構造と電子状態の電気化学的制御を探求する.

主な方法:

  • 弱いリンクのアプローチによる合成
  • 多核 NMRスペクトロスコーピー,サイクルボルトメトリー,UV対NIRスペクトロスコーピーを用いた特徴付け.
  • 単結晶X線 difraktion (SCXRD) と密度関数理論 (DFT) の計算による構造的決定.

主要な成果:

  • レドックス交換可能なヘミラビルリガンド (RHL) を含んだPt(II) 複合体の合成に成功した.
  • フェロセンの酸化状態によって制御される完全に閉じた状態と半開いた状態の間の可逆的な切り替えの実証.
  • システム内の4つの異なる調整状態の識別と特徴付け,レドックスポテンシャルと構造によって調節される.

結論:

  • RHLベースのシステムは,前例のない電気化学制御を調整場所の占有率に提供します.
  • この研究は,複数の切り替え可能な状態を持つダイナミック・コーディネーション・コンプレックスを設計するための新しいパラダイムを確立しています.
  • この発見は刺激に反応する材料や 分子装置への道を開きます