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Related Concept Videos

The Proteasome01:13

The Proteasome

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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.
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The Proteasome02:18

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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.
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The Proteasome Structure01:17

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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.
The proteasome is an...
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Regulated Protein Degradation02:58

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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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In-vitro Reconstitution of Bacterial Ubiquitination and VCP/p97-mediated Elimination
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Ubiquitin recognition by the proteasome.

Yasushi Saeki1

  • 1Laboratory of Protein Metabolism, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan.

Journal of Biochemistry
|January 11, 2017
PubMed
Summary
This summary is machine-generated.

The 26S proteasome degrades ubiquitylated proteins, with new research showing monoubiquitylation also signals protein degradation. This review covers proteasome structure, ubiquitin signals, and regulatory factors.

Keywords:
ATPaseproteasomeprotein degradationubiquitinubiquitin ligase

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • The 26S proteasome is a large complex crucial for regulated protein degradation in eukaryotic cells.
  • Protein degradation is vital for numerous cellular processes, including cell cycle control and signal transduction.
  • Ubiquitylation serves as a key signal for targeting proteins to the proteasome.

Purpose of the Study:

  • To review recent advances in understanding the 26S proteasome.
  • To explore the role of different ubiquitin topologies in proteasome targeting.
  • To highlight cellular factors regulating proteasomal degradation.

Main Methods:

  • Literature review of recent studies on proteasome structure and function.
  • Analysis of research on ubiquitin signaling in protein degradation.
  • Synthesis of information on regulatory mechanisms of the proteasome.

Main Results:

  • The 26S proteasome's structure and mechanism of substrate degradation are complex and dynamic.
  • Recent findings expand the known ubiquitin signals for proteasomal degradation beyond Lys48-linked tetraubiquitin.
  • Monoubiquitylation and other short ubiquitin chains can also target proteins for degradation.

Conclusions:

  • The paradigm for proteasomal substrate targeting is evolving with new insights into ubiquitin signaling.
  • A deeper understanding of proteasome regulation is essential for comprehending cellular homeostasis.
  • Future research will likely uncover more intricate details of proteasome-ubiquitin interactions and regulation.