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相关概念视频

Ligand Binding Sites02:40

Ligand Binding Sites

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...
Protein-protein Interfaces02:04

Protein-protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Ligand Binding and Linkage00:49

Ligand Binding and Linkage

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 the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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...
Protein-Protein Interfaces02:04

Protein-Protein Interfaces

Many proteins form complexes to carry out their functions, making protein-protein interactions (PPIs) essential for an organism's survival. Most PPIs are stabilized by numerous weak noncovalent chemical forces. The physical shape of the interfaces determines the way two proteins interact. Many globular proteins have closely-matching shapes on their surfaces, which form a large number of weak bonds. Additionally, many PPIs occur between two helices or between a surface cleft and a polypeptide...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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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相关实验视频

Updated: Jul 9, 2026

Designing Silk-silk Protein Alloy Materials for Biomedical Applications
11:14

Designing Silk-silk Protein Alloy Materials for Biomedical Applications

Published on: August 13, 2014

选择性蛋白质-蛋白质相互作用是由氨接口驱动的.

Nicholas C Yoder1, Krishna Kumar

  • 1Department of Chemistry, Tufts University, Medford, MA 02155, USA.

Journal of the American Chemical Society
|January 5, 2006
PubMed
概括
此摘要是机器生成的。

研究人员设计了新型蛋白质接口,使用氨残留物在卷轴-卷轴序列中. 这些稳定的α-螺旋束自排序,为细胞信号控制提供了潜力.

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Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study
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OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy
08:34

OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy

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Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study
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OaAEP1-Mediated Enzymatic Synthesis and Immobilization of Polymerized Protein for Single-Molecule Force Spectroscopy
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科学领域:

  • 生物化学 生物化学
  • 结构生物学 结构生物学
  • 分子生物学分子生物学

背景情况:

  • 蛋白质与蛋白质的相互作用对于细胞过程至关重要.
  • 高特异性接口是治疗干预的目标.
  • 卷曲-卷曲结构是常见的蛋白质图案.

研究的目的:

  • 为了设计新的,自我排序的蛋白质接口.
  • 调查氨残留物在卷轴-卷轴稳定性和特异性的作用.
  • 探索这些工程接口在细胞信号传输中的潜力.

主要方法:

  • 设计和合成30个残留物单体与氨核心残留物.
  • 对α螺旋束形成和稳定性的分析.
  • 使用热量计,评估组合中的自我排序行为.
  • 与含有亚利法性核心侧链的酸的特异性比较.

主要成果:

  • 卷轴-卷轴序列与 fenilalanine 核心残留物形成稳定的α-螺旋捆.
  • 这些工程体表现出自我分类行为,与具有异质核的类似体分离.
  • 基布斯自由特异能 (DeltaG) 的测量值为-1.5 kcal/mol.
  • 使用正规氨基酸设计的接口在天然蛋白质中似乎是新鲜的.

结论:

  • 带有 fenylalanine 核的工程螺旋-coil 片提供了一个强大的自我分类系统.
  • 这种自排序机制表现出高的特异性,与现有系统可比.
  • 这些发现为设计用于生物技术应用的蛋白质-蛋白质相互作用提供了新的途径.