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相关概念视频

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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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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Drug-Receptor Bonds01:25

Drug-Receptor Bonds

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Drug-receptor bonds are formed through various chemical forces when drugs interact with target cells. Covalent bonds, strong and irreversible, are exemplified by DNA-alkylating anticancer agents that inhibit cell division. However, such irreversible drug binding lacks selectivity and can modify the DNA of the surrounding healthy cells. Covalent binding often contributes to tissue toxicity, as seen with chloroform and paracetamol metabolites binding to the liver, causing hepatotoxicity.
In...
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Drug-Receptor Interactions01:29

Drug-Receptor Interactions

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Drug-receptor interaction describes the binding of receptors by drugs, but not all drug-receptor interactions result in activation and tissue response. For instance, the binding of agonists activates the receptor to generate a cellular reaction, while antagonists bind to receptors without causing their activation.
Several parameters, such as the drug's affinity for its receptor and its efficacy, which is its ability to activate the receptor, determine the drug's effect on the tissue....
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Factors Affecting Protein-Drug Binding: Drug Interactions01:23

Factors Affecting Protein-Drug Binding: Drug Interactions

121
Drug interactions are a critical aspect of pharmacology and can occur when two or more drugs compete for the same binding site. This competition can result in one drug displacing another, altering the effect of the displaced drug. Drug interactions are complex processes that rely heavily on how much of the displacer drug is present and how strongly it can bind to the same sites as the displaced drug.
Displacement interactions can have varying outcomes, ranging from toxicity to virtually...
121
Ligand Binding Sites02:40

Ligand Binding Sites

12.8K
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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Biosensor-based High Throughput Biopanning and Bioinformatics Analysis Strategy for the Global Validation of Drug-protein Interactions
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高亲和度生物分子相互作用是由低亲和度结合剂调节的.

S Mukundan1, Girish Deshpande2,3, M S Madhusudhan4

  • 1Indian Institute of Science Education and Research, Dr. Homi Bhabha Road, Pune, 411008, India.

NPJ systems biology and applications
|August 10, 2024
PubMed
概括

以前被忽视的低亲和度结合剂可以显著影响高亲和度分子相互作用. 这项研究引入了"群体调节",展示了这些较弱的结合剂如何影响相互作用动态和细胞过程.

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科学领域:

  • 分子生物学分子生物学
  • 系统生物学 系统生物学
  • 生物物理学的生物物理.

背景情况:

  • 分子相互作用强度用解离常数 (KD) 量化.
  • 高亲和度相互作用 (KD ≤ 10-8 M) 通常被研究为它们的二进制开/关开关行为.
  • 低亲和度结合剂 (KD>>10-5M) 在细胞分析中经常被忽视,尽管它们的潜在患病率很高.

研究的目的:

  • 研究低亲和度结合剂对高亲和度分子相互作用的影响.
  • 通过低亲缘关系结合剂引入和定义"群体调节"的概念.
  • 探索群体调节在生物系统中的影响,并提出实验验证.

主要方法:

  • 吉尔斯皮的随机模拟用于模拟分子动力学.
  • 分析相互作用动力学和稳定状态的连续方法.
  • 在Drosophila melanogaster的性别确定和分子值信号系统中的案例研究.

主要成果:

  • 证明低亲和度结合剂可以改变高亲和度相互作用的动力学和稳定状态行为.
  • 引入并定义了"群体调节"效应.
  • 评估了群体调节在特定生物环境中的影响,并提出了体外验证实验.

结论:

  • 低亲和度结合剂在通过"群体调节"来调节高亲和度相互作用方面发挥着至关重要的作用.
  • 这种调节机制在依赖于恒温的分子值的生物系统中可能很重要.
  • 需要进一步的实验验证,以确认群体调节在细胞过程中的广泛相关性.