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相关概念视频

Regulated Protein Degradation02:58

Regulated Protein Degradation

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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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Eukaryotic cells can degrade proteins through several pathways. One of the most important amongst 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. A series of enzymes carry out the ubiquitination of the target proteins - E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3...
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Proteins: From Genes to Degradation02:11

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Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick.  Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
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mRNA Stability and Gene Expression02:51

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The structure and stability of mRNA molecules regulates gene expression, as mRNAs are a key step in the pathway from gene to protein. In eukaryotes, the half-life of mRNA varies from a few minutes up to several days. mRNA stability is essential in growth and development. The absence of the proteins regulating its stability, such as tristetraprolin in mice, can cause systemic issues, including bone marrow overgrowth, inflammation, and autoimmunity.
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Export of Misfolded Proteins out of the ER01:32

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After folding, the ER assesses the quality of secretory and membrane proteins. The correctly folded proteins are cleared by the calnexin cycle for transport to their final destination, while misfolded proteins are held back in the ER lumen. The ER chaperones attempt to unfold and refold the misfolded proteins but sometimes fail to achieve the correct native conformation. Such terminally misfolded proteins are then exported to the cytosol by ER-associated degradation or ERAD pathway for...
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The Proteasome Structure

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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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Cycloheximide Chase Analysis of Protein Degradation in Saccharomyces cerevisiae
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捕获蛋白质进行降解

Charlotte M Schilling1, Eilika Weber-Ban1

  • 1Institute of Molecular Biology and Biophysics, ETH Zurich, Zurich, Switzerland.

Science (New York, N.Y.)
|August 24, 2023
PubMed
概括
此摘要是机器生成的。

一种新的无素独立途径将核蛋白导向蛋白质体进行降解. 这一发现揭示了细胞核中蛋白质循环的新机制.

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相关实验视频

Last Updated: Jul 18, 2025

Cycloheximide Chase Analysis of Protein Degradation in Saccharomyces cerevisiae
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科学领域:

  • 细胞生物学
  • 分子生物学
  • 生物化学

背景情况:

  • 蛋白质体是负责蛋白质降解的关键细胞机器.
  • 蛋白质降解通常由无素-蛋白酶体系统介导.
  • 向核蛋白质到蛋白质组的机制尚未完全理解.

研究的目的:

  • 调查一种新的向核蛋白质的途径.
  • 阐明核蛋白循环中的无素独立机制的作用.

主要方法:

  • 使用酵母模型进行基因查.
  • 使用生物化学测试来分析蛋白质相互作用.
  • 进行显微镜检查,

主要成果:

  • 确定了一种针对特定核蛋白的新途径.
  • 证明这种途径可以独立于ubiquitin结合.
  • 描述了参与这种新目标机制的关键蛋白质成分.

结论:

  • 核蛋白质的降解存在一种无素独立的途径.
  • 这一途径代表了我们对细胞蛋白质平衡的理解.
  • 对这种途径的进一步研究可能会揭示新的治疗点.