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関連する概念動画

Relative Strengths of Conjugate Acid-Base Pairs02:29

Relative Strengths of Conjugate Acid-Base Pairs

Brønsted-Lowry acid-base chemistry is the transfer of protons; thus, logic suggests a relation between the relative strengths of conjugate acid-base pairs. The strength of an acid or base is quantified in its ionization constant, Ka or Kb, which represents the extent of the acid or base ionization reaction. For the conjugate acid-base pair HA / A−, the ionization equilibrium equations and ionization constant expressions are
Weak Acid Solutions04:02

Weak Acid Solutions

Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
Weak Base Solutions03:21

Weak Base Solutions

Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

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:
The Equilibrium Binding Constant and Binding Strength02:18

The Equilibrium Binding Constant and Binding Strength

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:
Protein-Drug Binding: Determination Methods01:22

Protein-Drug Binding: Determination Methods

Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...

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関連する実験動画

Updated: Jul 19, 2026

Determination of Protein-ligand Interactions Using Differential Scanning Fluorimetry
13:26

Determination of Protein-ligand Interactions Using Differential Scanning Fluorimetry

Published on: September 13, 2014

プロトンがタンパク質に結合する:pK (a) 明確な溶媒モデルと暗黙の溶媒モデルによる計算

Thomas Simonson1, Jens Carlsson, David A Case

  • 1Laboratoire de Biochimie (UMR7654 du CNRS), Department of Biology, Ecole Polytechnique, 91128 Palaiseau, France. thomas.simonson@polytechnique.fr

Journal of the American Chemical Society
|April 1, 2004
PubMed
まとめ

分子ダイナミクスの自由エネルギーシミュレーションは,タンパク質のpKaシフトを正確に予測します. 一般化されたボーン (GB) モデルのような暗黙の溶媒モデルは,複雑なタンパク質の再編成であっても,これらのシフトを計算するのに有望であることを示しています.

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PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions
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A Guide to Production, Crystallization, and Structure Determination of Human IKK1/&#945;
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関連する実験動画

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13:26

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Published on: September 13, 2014

PIP-on-a-chip: A Label-free Study of Protein-phosphoinositide Interactions
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A Guide to Production, Crystallization, and Structure Determination of Human IKK1/&#945;
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Published on: November 2, 2018

科学分野:

  • バイオフィジックス 生物物理学
  • コンピューティング・ケミストリー
  • タンパク質科学 タンパク質科学

背景:

  • イオン化可能な残留物は,タンパク質の機能に不可欠です.
  • 陽子結合 (pKa) は静電相互作用を明らかにする.
  • 精密なpKa予測は,タンパク質の行動を理解するために不可欠です.

研究 の 目的:

  • 分子ダイナミクス自由エネルギーシミュレーション (MDFE) を使用してアスパルト酸塩残基のpKaシフトを計算する.
  • 一般化されたBorn (GB) モデルを使用して,明示的な溶媒シミュレーションと暗示的な溶媒シミュレーションを比較する.
  • pKaシフトに対するタンパク質再編成効果を調査する.

主な方法:

  • 分子動力学自由エネルギーシミュレーション (MDFE) は,明示的および暗示的 (GB) 溶媒を使用しています.
  • 2つのタンパク質の3つのアスパルテートサイドチェーンのプロトンpKaシフトの計算.
  • イオン化中の介電反応とタンパク質再構成の分析.

主要な成果:

  • 明確な溶媒シミュレーションは,AMBERとCHARMMの力場によるpKaシフトの方向を正しく予測しました.
  • いくつかのアスパルテートには,複数のサブステートまたは重要な再編成による非線形介電反応が観察されました.
  • GB溶媒を使ったMDFEは,タンパク質の再編成を正確に記述し,実験データと明示的な溶媒シミュレーションとの良好な一致を示しました.

結論:

  • MDFEは,特にGBの暗黙の溶媒は,複雑なタンパク質のダイナミクスを捉え,pKaの予測のための強力なツールです.
  • 暗黙の溶剤モデルは,pKa計算のための明示的な溶剤に計算的に効率的で正確な代替案を提供します.
  • タンパク質の再編成を理解することは,特に大きなシフトを持つ埋もれた残留物に対して,正確なpKa予測の鍵です.