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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 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

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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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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Amino Acid Catabolism01:18

Amino Acid Catabolism

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Microorganisms rely on proteins as an essential carbon and energy source, particularly in environments with limited polysaccharides or lipids. However, proteins are too large to cross the plasma membrane unaided, necessitating enzymatic degradation. Microbes secrete extracellular proteases and peptidases that hydrolyze proteins into peptides, which can then be transported across the membrane. Once inside the cell, intracellular proteases degrade these peptides into free amino acids, which...
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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...
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Updated: Oct 8, 2025

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
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Structural and biochemical elements of efficiently degradable proteasome substrates.

Takuya Tomita1

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

Journal of Biochemistry
|December 30, 2021
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The ubiquitin-proteasome system (UPS) degrades proteins via ubiquitination and unfolding. Understanding substrate destabilizing elements and their interplay is key for targeted protein degradation drug development.

Keywords:
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Area of Science:

  • Cellular Biology
  • Biochemistry

Background:

  • The ubiquitin-proteasome system (UPS) is the primary cellular mechanism for regulated proteolysis, ensuring high specificity in protein elimination.
  • The proteasome complex binds ubiquitinated substrates, utilizing disordered regions to initiate unfolding and subsequent degradation.

Purpose of the Study:

  • To review destabilizing elements influencing proteasome substrate stability.
  • To discuss the interplay between ubiquitination, initiation regions, and unfolding stability.

Main Methods:

  • Literature review focusing on recent studies of ubiquitination and proteasome-substrate interactions.
  • Analysis of substrate characteristics susceptible to proteasomal degradation.

Main Results:

  • Identified key destabilizing elements: ubiquitination, specific initiation regions, and susceptibility to unfolding.
  • Highlighted the interplay of these elements in determining overall substrate stability.

Conclusions:

  • A spatial perspective is crucial for understanding proteasomal degradation mechanisms.
  • Insights into substrate recognition and degradation are vital for developing targeted protein degradation therapies targeting the UPS.