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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 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.
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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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Updated: Apr 11, 2026

Author Spotlight: Tracing the Ferroptotic Signatures and Cell Death Dynamics in Medulloblastoma for Advanced Therapeutics
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Dissecting Complex Interactions Between Ferroptosis and the Proteasome.

Magdalena B Murray1, Rishi Upadhyay1, Krystina Szylo1

  • 1Department of Biology, Stanford University, Stanford, CA 94305, USA.

Biorxiv : the Preprint Server for Biology
|April 10, 2026
PubMed
Summary
This summary is machine-generated.

Proteasome inhibition impacts cell death pathways, enhancing ferroptosis sensitivity to GPX4 inhibition but conferring resistance to system x- inhibition. This reveals complex proteasome roles in ferroptosis regulation.

Keywords:
Oxidative stresscanceriron metabolismlipid peroxidationnecrosisprotein synthesisubiquitination

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Area of Science:

  • Cellular biology
  • Biochemistry
  • Molecular mechanisms of cell death

Background:

  • The proteasome is crucial for protein degradation and cell survival, and its inhibition can induce apoptosis.
  • Ferroptosis is a distinct form of regulated cell death, with its regulatory pathways still under active investigation.
  • The interplay between proteasome function and ferroptosis sensitivity remains largely unexplored due to the proteasome's essential role.

Purpose of the Study:

  • To elucidate how proteasome inhibition influences sensitivity to ferroptosis.
  • To dissect the complex cross-talk between proteasome function and ferroptosis.
  • To develop novel methodologies for studying essential cellular processes.

Main Methods:

  • Direct cell death imaging techniques were employed.
  • Cell death pathway-specific inhibitors were utilized.
  • Mathematical modeling was integrated to analyze cell death dynamics.

Main Results:

  • Proteasome inhibition was found to sensitize cells to ferroptosis induced by glutathione peroxidase 4 (GPX4) inhibition.
  • Conversely, proteasome inhibition promoted resistance to ferroptosis triggered by system x- inhibition.
  • Sensitization to GPX4 inhibition necessitates protein synthesis and is counteracted by the activating transcription factor 4 (ATF4) pathway, independent of apoptosis execution.

Conclusions:

  • Proteasome function plays a multifaceted role in regulating ferroptosis.
  • Distinct ferroptosis induction methods exhibit differential sensitivity to proteasome inhibition.
  • The study establishes innovative methods for dissecting the intricate connections between ferroptosis and fundamental cellular processes.