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Related Concept Videos

The Proteasome02:18

The Proteasome

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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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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

The Proteasome

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The Proteasome Structure01:17

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.
The proteasome is an...
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Initiation of Translation02:33

Initiation of Translation

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
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Initiation of Translation02:33

Initiation of Translation

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Assaying Proteasomal Degradation in a Cell-free System in Plants
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Substrate selection by the proteasome through initiation regions.

Takuya Tomita1, Andreas Matouschek1

  • 1Department of Molecular Biosciences, The University of Texas at Austin, Austin, Texas, 78712.

Protein Science : a Publication of the Protein Society
|May 11, 2019
PubMed
Summary
This summary is machine-generated.

The proteasome, a cellular machine, degrades unwanted proteins. It specifically targets proteins tagged with ubiquitin, initiating degradation at disordered regions for precise cellular cleanup.

Keywords:
initiation regionproteasomeprotein degradationprotein unfoldingubiquitin

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Area of Science:

  • Cellular Biology
  • Biochemistry
  • Molecular Mechanisms

Background:

  • Cellular proteins require regulated degradation when damaged or no longer needed.
  • The proteasome is the primary enzymatic complex responsible for regulated protein degradation.
  • Ubiquitination targets proteins for proteasomal degradation.

Purpose of the Study:

  • To review how the proteasome selects initiation sites on its substrates.
  • To discuss the impact of proteasomal degradation initiation on physiological processes.

Main Methods:

  • Literature review of proteasomal degradation mechanisms.
  • Analysis of substrate recognition and initiation site selection by the proteasome.
  • Discussion of the physiological relevance of proteasomal substrate selection.

Main Results:

  • Proteasomal degradation initiation relies on identifying disordered regions within ubiquitinated substrates.
  • The selection of initiation sites is a key factor in the specificity of proteasomal degradation.
  • This initiation process influences various cellular functions and physiological outcomes.

Conclusions:

  • Understanding proteasome initiation site selection is crucial for comprehending protein homeostasis.
  • The specificity of proteasomal degradation is intrinsically linked to its initiation mechanism.
  • Dysregulation of this process can have significant implications for cellular health and disease.