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Related Concept Videos

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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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 Proteasome01:13

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Structural Protein Function01:56

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Fruits form from a mature flower ovary. As seeds develop from the ovules contained within, the ovary wall undergoes a series of complex changes to form fruit. In some fruits, such as soybeans, the ovary wall dries; in other fruits, such as grapes, it remains fleshy. In some cases, organs other than the ovary contribute to fruit formation; such fruits are called accessory fruits.
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Quantifying Subcellular Ubiquitin-proteasome Activity in the Rodent Brain
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Altered nuclear envelope structure and proteasome function of micronuclei.

Kendra K Maass1, Fabian Rosing2, Paolo Ronchi3

  • 1Division of Molecular Genetics, German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg, Germany; Faculty of Biosciences, Heidelberg University, Germany.

Experimental Cell Research
|August 28, 2018
PubMed
Summary

Micronuclei, linked to DNA damage, exhibit unique structural and functional defects. These include altered nuclear envelopes, lack of proteasomes, and compacted chromatin, potentially driving genomic instability and cancer.

Keywords:
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Area of Science:

  • Cell Biology
  • Genetics
  • Cancer Research

Background:

  • Micronuclei are formed from whole chromosomes or fragments lost during cell division.
  • Their role in tumorigenesis is poorly understood despite a known link to DNA damage.

Purpose of the Study:

  • To investigate the functional organization and molecular composition of micronuclei.
  • To explore how micronuclear defects contribute to genomic instability and cancer.

Main Methods:

  • Electron microscopy to visualize micronuclear membrane-lysosome fusions.
  • Analysis of nuclear envelope protein composition.
  • Assessment of proteasome activity within micronuclei.
  • Chromatin compaction analysis.

Main Results:

  • Micronuclear membranes fuse with lysosomes, linking lysosome function to DNA damage.
  • Micronuclei show altered nuclear envelopes with increased LBR/emerin and decreased nuclear pore proteins.
  • Active proteasomes and ubiquitin proteasome system factors are absent in micronuclei.
  • Micronuclear chromatin is more compacted than primary nuclear chromatin.

Conclusions:

  • Micronuclear defects, including altered composition and lack of proteasomes, may promote catastrophic genomic rearrangements.
  • These findings provide insights into the contribution of micronuclei to tumorigenesis.