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相关概念视频

Covalently Linked Protein Regulators02:04

Covalently Linked Protein Regulators

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Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
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The Proteasome01:13

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Eukaryotic cells can degrade proteins through several pathways. One of the most important among these is the ubiquitin-proteasome pathway. It helps the cell eliminate the misfolded, damaged, or unwarranted cytoplasmic proteins in a highly specific manner.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
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In the secretory pathway, vesicles transport proteins from one cellular compartment to another in forward transport to deliver the protein to its correct location. Occasionally, misfolded proteins and incorrect proteins escape their original compartments, and a retrieval pathway is used to return the escaped proteins to their original compartment.
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It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
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Protein Complexes with Interchangeable Parts01:57

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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.
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The ubiquitin-proteasome pathway is a well-known mechanism utilized by eukaryotic cells to remove cytoplasmic proteins that are misfolded, damaged, or no longer needed. In this pathway, the protein that needs to be eliminated undergoes a process called ubiquitination, where a chain of ubiquitin molecules is attached to the 48th lysine residue of the target protein. This ubiquitin modification helps the proteasome distinguish between a target protein and a healthy protein.
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相关实验视频

Updated: Jun 13, 2025

Using Phage Display to Develop Ubiquitin Variant Modulators for E3 Ligases
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一种经过工程设计的,与ubiquitin结合的卷状卷状.

Pernille Vosbein1, Paula Paredes Vergara2, Danny T Huang2,3

  • 1School of Chemistry, University of Glasgow Glasgow G12 8QQ UK Drew.Thomson@glasgow.ac.uk.

Chemical science
|September 13, 2024
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概括

研究人员设计了一种稳定的卷曲-卷曲基架,呈现出基相互作用基因 (UIM) 残留物. 这种新型的CC-UIM与UIM单独相比,显示了与ubiquitin (Ub) 的增强结合,为蛋白质结合剂设计提供了新的策略.

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科学领域:

  • 生物化学 生物化学
  • 蛋白质工程是指蛋白质的工程.
  • 结构生物学 结构生物学

背景情况:

  • 在细胞过程中,ubiquitin (Ub) 的识别是至关重要的.
  • 乌比基结合域,如乌比基交互动因子 (UIM),通常会调解低亲和度的相互作用.
  • 设计高亲和度的Ub结合剂是一个重大挑战.

研究的目的:

  • 设计一种新的基架,用于增强无素结合.
  • 为了创建一个稳定的,交叉链接的卷轴-卷轴 (CC) ,呈现UIM结合残留物.
  • 为了研究设计的-乌比奎丁相互作用的结合亲和力和结构基础.

主要方法:

  • 设计和合成一个包含UIM序列的交叉连接的卷轴-卷轴 (CC-UIM).
  • 光极化试验量化了与ubiquitin的结合亲和力.
  • 进行X射线晶体学以确定CC-UIM的结构与ubiquitin复合.

主要成果:

  • 与最初的UIM序列相比,交联CC-UIM的结合亲和力显著增强,与乌比奎丁结合.
  • 晶体结构揭示了稳定的螺旋脚手架上关键结合残留物的预组织.
  • 该CC-UIM成功地调和了UIM和CC序列的特征.

结论:

  • 预先将关键结合残留物组织到稳定的螺旋脚手架上是设计高亲和度蛋白质结合剂的有效策略.
  • 该CC-UIM是一种有前途的工具,用于研究ubiquitin相互作用.
  • 这种方法推进了蛋白质-蛋白质相互作用调制和药物设计领域.