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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 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.
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Translocation of Proteins into the Mitochondria01:19

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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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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Related Experiment Video

Updated: Mar 13, 2026

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
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Quantitative Proteomics Illuminates a Functional Interaction between mDia2 and the Proteasome.

Tadamoto Isogai, Rob van der Kammen, Onno B Bleijerveld

  • 1Biomolecular Mass Spectrometry and Proteomics Group, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Utrecht University , 3584 CH Utrecht, The Netherlands.

Journal of Proteome Research
|October 23, 2016
PubMed
Summary
This summary is machine-generated.

Formin mDia2 protein interacts with the proteasome and ubiquitin. Its open conformation regulates actin dynamics by controlling proteasome activity, revealing a novel regulatory mechanism.

Keywords:
ForminSILACaffinity purificationbiochemistrymass spectrometryquantitative proteomics

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Formin mDia2 is a cytoskeleton regulator controlling actin assembly.
  • mDia2 exists in closed (inhibited) and open (active) conformations.
  • mDia2 has known actin-dependent and independent functions.

Purpose of the Study:

  • To investigate novel functions and regulatory modes of formin mDia2.
  • To identify mDia2-interacting partners beyond actin regulation.

Main Methods:

  • Quantitative proteomics using stable isotope labeling.
  • Biochemical assays to validate protein interactions.
  • Proteasome activity assays and proteome-wide analyses.

Main Results:

  • Proteasome and Ubiquitin identified as mDia2-interacting partners.
  • mDia2 is ubiquitinated but not a proteasome substrate.
  • mDia2 regulates proteasome activity and cellular levels of substrates like β-catenin.

Conclusions:

  • Formin mDia2 interacts with the ubiquitin-proteasome system.
  • The open conformation of mDia2 regulates actin dynamics via proteasome modulation.
  • This study uncovers a new layer of mDia2 regulation impacting cellular processes.