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相关概念视频

Protein Folding01:25

Protein Folding

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Proteins are chains of amino acids linked together by peptide bonds. Upon synthesis, a protein folds into a three-dimensional conformation, critical to its biological function. Interactions between its constituent amino acids guide protein folding, and hence the protein structure is primarily dependent on its amino acid sequence.
Protein Structure Is Critical to Its Biological Function
Proteins perform a wide range of biological functions such as catalyzing chemical reactions, providing...
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Protein Complexes with Interchangeable Parts01:57

Protein Complexes with Interchangeable Parts

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Groups of proteins may form a complex where each protein in this complex has a different role in the overall execution of the complex’s function. Often some of the proteins in the complex can be replaced by a closely related variant to give a complex that contains many of the same components yet is functionally distinct.
The SCF ubiquitin ligase is a protein complex of five individual proteins. This complex attaches ubiquitin to other target proteins to mark them for degradation. In order...
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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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Mechanical Protein Function01:58

Mechanical Protein Function

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Allosteric Proteins-ATCase01:19

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Binding sites linkages can regulate a protein's function.  For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to  N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
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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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Updated: Aug 21, 2025

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设计一个可转换的人工金属蛋白

Saman Fatima1, David G Boggs2, Noor Ali3

  • 1Department of Chemistry, University of Illinois Urbana-Champaign, 600 S. Mathews Avenue, Urbana, Illinois61801, United States.

Journal of the American Chemical Society
|November 15, 2022
PubMed
概括
此摘要是机器生成的。

研究人员开发了可切换的人工金属蛋白 (swArM),在结合时改变形状. 该平台研究蛋白质动态和金属因子活性是如何相互连接的,模仿自然的金属酶.

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科学领域:

  • 生物有机化学
  • 蛋白质工程
  • 生物物理化学

背景情况:

  • 金属酶的功能依赖于结构变化,将蛋白质结构与金属因子活动联系起来.
  • 现有的人工金属蛋白 (ArM) 往往缺乏动态灵活性,限制它们模拟自然系统的能力.
  • 对于生物启发的催化剂设计来说,了解在调节金属因子反应性的作用至关重要.

研究的目的:

  • 设计可转换形状的人造金属蛋白 (swArM),经历大规模的结构变化.
  • 研究蛋白质结构动力学与金属因子电子结构和反应性的相互作用.
  • 建立一个研究金属因子功能的调节平台.

主要方法:

  • 在E. coli胺结合蛋白 (GlnBP) 中 (II) bis (dimethylglyoxime) (Co (dmgH) 2 (X)) 金属结合因子的特定部位的结合.
  • 光谱技术 (紫外线,光,CD,红外线) 和质谱法用于表征.
  • 用于结构确定的X射线晶体学和用于结合研究的同热度定位热量计.

主要成果:

  • 在 GlnBP 内部成功设计了 site-specific 的 Co-S 囊结合.
  • 已经证明,全性谷氨酸结合会诱导蛋白质构成的显著变化.
  • 表明蛋白质环境稳定了Co-S键,而形状变化则调节了其解离率.

结论:

  • 开发了一种新的swArM平台,使得可以研究基驱动的金属因子调节.
  • 在人工系统中建立了蛋白质构造动力学和金属因子反应性之间的直接联系.
  • 在模仿和理解天然金属酶机制方面,swArms提供了强大的工具.