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Related Concept Videos

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 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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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
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Charge-mediated proteasome targeting.

Anna Kudriaeva1, Ekaterina S Kuzina1, Oleg Zubenko1

  • 1Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, Russian Federation.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|February 28, 2019
PubMed
Summary
This summary is machine-generated.

Researchers discovered a third type of direct proteasome signal (DPS) mediated by protein charge. This charge-mediated DPS bypasses the need for ubiquitination, offering a new pathway for protein degradation.

Keywords:
PA28/11S/REG regulatory subunitdirect proteasomal signalmyelin basic proteinproteasome recognitionubiquitin-independent degradation

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • The ubiquitin-proteasome system (UPS) is crucial for degrading most intracellular mammalian proteins.
  • Proteasome recognizes proteins via ubiquitination (Ub) or direct proteasome signals (DPSs).
  • Two types of DPSs (sequence-based and post-translational modification-based) are known.

Purpose of the Study:

  • To identify and characterize a novel, third type of direct proteasome signal.
  • To investigate the mechanism and features of this new degradation signal.
  • To explore its implications for proteasome-substrate interactions.

Main Methods:

  • Characterization of a novel charge-mediated DPS.
  • Analysis of its composition, length, and amino acid properties.
  • Investigation of its interaction with proteasome regulatory subunits (REGα, REGγ) and ATP independence.

Main Results:

  • A third type of DPS, charge-mediated, was identified.
  • This DPS is a composition-dependent element, not sequence-dependent, enriched in basic and flexible amino acids.
  • It is efficiently engaged by proteasomes capped with REGα or REGγ in an ATP-independent manner.

Conclusions:

  • A novel modality of proteasome targeting, bypassing ubiquitination, has been discovered.
  • Charge-mediated DPS represents a significant addition to the known mechanisms of protein degradation.
  • This finding opens new avenues for understanding proteasome function and regulation.