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関連する概念動画

Ligand Binding Sites02:40

Ligand Binding Sites

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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
Protein-ligand interactions are quite specific; even though numerous potential ligands surround a cellular protein at any given time, only a particular ligand can bind to that protein. Moreover, a ligand binds only to a dedicated area on the surface of the protein, known as the...
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The Equilibrium Binding Constant and Binding Strength02:18

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The equilibrium binding constant (Kb) quantifies the strength of a protein-ligand interaction. Kb can be calculated as follows when the reaction is at equilibrium:
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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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Ligand Binding and Linkage00:49

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Allosteric proteins have more than one ligand binding site; the binding of a ligand to any of these sites influences the binding of ligands to the other sites. When a protein is allosteric, its binding sites are called coupled or linked.  In the case of enzymes, the site that binds to the substrate is known as the active site and the other site is known as the regulatory site. When a ligand binds to the regulatory site, this leads to conformational changes in the protein that can influence...
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Many proteins’ biological role depends on their interactions with their ligands, small molecules that bind to specific locations on the protein known as ligand-binding sites. Ligand-binding sites are often conserved among homologous proteins as these sites are critical for protein function.
Binding sites are often located in large pockets, and if their location on a protein’s surface is unknown, it can be predicted using various approaches. The energetic method computationally...
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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リガンド結合の移行状態はどの程度強固か?

Samik Bose1, Samuel D Lotz1, Indrajit Deb1

  • 1Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824, United States.

Journal of the American Chemical Society
|November 9, 2023
PubMed
まとめ
この要約は機械生成です。

結合運動を用いた計算モデルで薬の有効性を予測する. 研究者は,溶解性エポキシードヒドローラゼ (sEH) 阻害剤のリガンド解約をシミュレートし,動力学に基づく薬剤設計の課題を明らかにした.

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科学分野:

  • コンピュータ化学
  • バイオ物理学
  • 薬理学について

背景:

  • 薬剤の有効性は,熱力学だけでよりよく薬剤結合運動 (オンレート,オフレート) によって予測されます.
  • 薬の化合物を最適化するには 運動に基づいた予測計算モデルが必要です
  • これらのモデルの寿命が短いにもかかわらず,リガンド結合の移行状態を理解することは極めて重要です.

研究 の 目的:

  • 溶解性エポキシドヒドローラゼ (sEH) 阻害剤のリガンド解約現象を計算的にモデル化する.
  • リガンド結合移行状態 (TSE) を分析する.
  • 動力学に基づく薬剤設計における課題と機会を特定する.

主な方法:

  • REVO (バリエーション最適化によるアンサンブルの再サンプリング) を利用した.
  • 5つのsEH阻害剤のシミュレートされた解約経路は,14. 25分から31. 75分までの滞在時間を持つ.
  • トランジション状態のアンサンブル特性とタンパク質-リガンドの相互作用に焦点を当てて解き放つアンサンブルを分析した.

主要な成果:

  • 平均的な予測精度は,滞在時間の大きさの範囲内です.
  • TSE (空間的分布,タンパク質-リガンド相互作用) の有意な差異が,類似した結合状態のリガンドで観察された.
  • リガンドの自由度などの一般的な特徴を考慮する際に,TSEの共通点を特定した.

結論:

  • リガンド結合の移行状態の集合は,類似の結合状態でも変化する複雑な振る舞いを表します.
  • リガンドの自由度などの一般的な特徴は,異なるTSE間で類似性を示します.
  • 移行状態の複雑さにより,合理的で運動学に基づいた薬物設計には大きな課題が残っています.