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The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

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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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The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

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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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Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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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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Molecules and Compounds02:38

Molecules and Compounds

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Atoms and Molecules
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Conserved Binding Sites01:49

Conserved Binding Sites

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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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関連する実験動画

Updated: Feb 13, 2026

Identification of Small Molecule-binding Proteins in a Native Cellular Environment by Live-cell Photoaffinity Labeling
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フォトアフィニティラベルによる小分子相互作用マッピングは,NSAIDの結合部位ホットスポットを明らかにする

Jinxu Gao1, Adelphe Mfuh1, Yuka Amako1

  • 1Department of Chemistry and Chemical Biology , Harvard University , 12 Oxford St. , Cambridge , Massachusetts 02138 , United States.

Journal of the American Chemical Society
|March 16, 2018
PubMed
まとめ

研究者は,薬物の相互作用をマッピングするために,光親近性ラベリング (SIM-PAL) による小分子相互作用マッピングという新しい方法を開発しました. この技術は,非ステロイド性抗炎症薬 (NSAIDs) と相互作用する1000以上のタンパク質を特定し,直接結合部位と潜在的な新しい治療メカニズムを明らかにしました.

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科学分野:

  • 化学生物学
  • プロテオミクス
  • 薬理学について

背景:

  • 単一の薬が複数の標的に作用するポリファーマコロジは,非ステロイド性抗炎症薬 (NSAID) のような治療薬に共通しています.
  • 細胞内の小さな分子に対する完全な分子相互作用 (インタラクトーム) のマッピングは困難です.
  • これらの相互作用を理解することは 薬物メカニズムの解明と 新しい治療用途の発見に不可欠です

研究 の 目的:

  • 小分子結合部位の直接的な細胞内特徴化のために,小分子相互作用マッピング (SIM-PAL) を開発し適用する.
  • 全細胞内のNSAIDの直接のタンパク質インタラクターと結合部位を特定する.
  • 既知の標的を超えてNSAIDのより広範なタンパク質相互作用を探求する.

主な方法:

  • タンパク質にNSAID誘導体の光化学結合を含むSIM-PALの開発.
  • 敏感な検出のために結合ペプチドの濃縮と同位体再コーディング.
  • マススペクトロメトリーによるNSAIDタンパク質の直接結合部位の特定

主要な成果:

  • 1000以上の濃縮タンパク質を含むNSAIDインタラクトームの特定
  • 約200の結合ペプチドの直接的な特徴付けで,細胞表面から細胞核へのNSAID結合部位を特定した.
  • ヒストンH2AとH2Bの写真NSAIDの特定の結合場所の発見と,NSAID結合によるCOX-2とヒストンH2Aの安定化.
  • 既知の (例えば,NF-κB) と新しい (例えば,AP-2,プロテアソーム) タンパク質複合体の相互作用の識別.

結論:

  • SIM-PALは,小分子インタラクトームのマッピングと細胞文脈における直接結合部位の特徴づけのための効果的なプラットフォームです.
  • NSAIDは,その定規の標的を超えた広範なタンパク質相互作用に参加し,これらのより広範な相互作用を通じて生物学的プロセスに潜在的に影響を与える.
  • SIM-PALプラットフォームは,多様な小分子の世界的結合部位のマッピングに適応し,薬剤発見とメカニズム研究のための強力なツールを提供します.