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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

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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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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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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Bacterial Protein Maturation01:26

Bacterial Protein Maturation

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Bacterial protein maturation is a tightly regulated process that ensures newly synthesized polypeptides achieve correct functional conformations. This maturation involves a series of modifications, folding events, and quality control steps, often assisted by specialized chaperone proteins.N-Terminal ModificationsThe maturation of bacterial polypeptides begins cotranslationally as the polypeptide exits the ribosome. The first amino acid, N-formylmethionine (fMet), is typically modified at the...
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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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Updated: Sep 19, 2025

Assaying Proteasomal Degradation in a Cell-free System in Plants
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"Pupdates" on proteasomal degradation in bacteria.

Shoshanna C Kahne1, K Heran Darwin1

  • 1Department of Microbiology, New York University Grossman School of Medicine, New York, New York, USA.

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|June 5, 2025
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Summary
This summary is machine-generated.

Recent findings reveal how bacteria target proteins to proteasomes for degradation. This minireview focuses on ATP-dependent proteolysis, highlighting recent advances in understanding bacterial proteasome regulation.

Keywords:
Mycobacteriumproteasomepupylation

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Area of Science:

  • Molecular Biology
  • Biochemistry

Background:

  • Proteasomes are essential multi-subunit proteases conserved across all life domains.
  • While eukaryotic proteasome regulation is well-studied, bacterial proteasome regulation remains less understood.
  • Protein targeting mechanisms to proteasomes differ significantly between organisms.

Purpose of the Study:

  • To review recent findings on protein targeting to bacterial proteasomes.
  • To focus on the mechanisms of ATP-dependent proteolysis in bacteria.
  • To elucidate the regulation of proteasome activity in bacteria.

Main Methods:

  • Literature review of recent studies on bacterial proteasomes.
  • Analysis of research focusing on ATP-dependent protein degradation pathways.
  • Synthesis of current knowledge on bacterial proteasome function.

Main Results:

  • Recent studies have identified specific mechanisms for targeting proteins to bacterial proteasomes.
  • ATP-dependent proteolysis plays a crucial role in regulating protein degradation in bacteria.
  • Key differences exist in how bacteria and eukaryotes target substrates to their respective proteasomes.

Conclusions:

  • Understanding bacterial proteasome regulation is crucial for comprehending cellular protein homeostasis.
  • Recent advances shed light on the specific targeting and degradation of proteins in bacteria.
  • Further research into ATP-dependent proteolysis in bacteria will reveal novel regulatory insights.