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Related Concept Videos

Nuclear Protein Sorting01:34

Nuclear Protein Sorting

Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
Proteins targeted to the nucleus carry nuclear localization signals or NLS recognized by import receptors in the cytosol. Similarly, proteins with nuclear export signals are recognized by export receptors. Import and export receptors are...
The Proteasome02:18

The Proteasome

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...
The Proteasome01:13

The Proteasome

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.
In this pathway, the target proteins are first tagged with small proteins called ubiquitin. This involves participation of a series of enzymes including— E1 (ubiquitin-activating enzyme), E2 (ubiquitin-conjugating enzyme), and E3 (ubiquitin...
The Proteasome02:18

The Proteasome

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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Post-translational Translocation of Proteins to the RER01:27

Post-translational Translocation of Proteins to the RER

A sizable fraction of proteins destined for ER are first synthesized in the cell cytosol and then transported across the ER membrane–a process called post-translational translocation. Similar to cotranslationally translocated proteins, these proteins also use the Sec translocon complex to enter the ER lumen.
Targeting proteins to the ER
Hsp40 and Hsp70 chaperone molecules bind the translated proteins in the cytosol to prevent their folding. The chaperone binding helps to keep the signal...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

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Related Experiment Video

Updated: May 29, 2026

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
09:57

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach

Published on: December 17, 2016

Proteasomes crossing the nuclear border.

Anca F Savulescu1, Asaf Rotem, Amnon Harel

  • 1Department of Biology, Technion-Israel Institute of Technology, Haifa, Israel.

Nucleus (Austin, Tex.)
|September 24, 2011
PubMed
Summary
This summary is machine-generated.

This study explores how proteasomes, the cell's protein-degrading machinery, move within the nucleus. It discusses mechanisms for targeting these complexes to specific nuclear sites and proposes a model for their assembly.

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Reconstitution of Msp1 Extraction Activity with Fully Purified Components
05:52

Reconstitution of Msp1 Extraction Activity with Fully Purified Components

Published on: August 10, 2021

Related Experiment Videos

Last Updated: May 29, 2026

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach
09:57

Examining Proteasome Assembly with Recombinant Archaeal Proteasomes and Nondenaturing PAGE: The Case for a Combined Approach

Published on: December 17, 2016

Reconstitution of Msp1 Extraction Activity with Fully Purified Components
05:52

Reconstitution of Msp1 Extraction Activity with Fully Purified Components

Published on: August 10, 2021

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Proteasomes are crucial for protein degradation in eukaryotic cells.
  • The precise localization and dynamic distribution of proteasomes within cellular compartments, particularly the nucleus, remain poorly understood.
  • Understanding proteasome localization is key to deciphering their roles in nuclear processes.

Purpose of the Study:

  • To review evidence linking proteasome activity to specific intranuclear locations.
  • To explore potential mechanisms responsible for targeting proteasome complexes to the nucleus.
  • To present a model for the regulated assembly of the 26S proteasome holoenzyme within the nucleus.

Main Methods:

  • Literature review of existing research on proteasome localization and function.
  • Analysis of studies employing cell-free reconstitution assays to observe proteasome targeting.
  • Comparative discussion of proteasome dynamics in open versus closed mitosis systems.

Main Results:

  • Evidence suggests proteasome activity is associated with specific intranuclear locations.
  • Intact proteasome particles can be targeted to newly formed nuclear compartments, as shown in cell-free systems.
  • Proteasomes are observed at the nuclear periphery and within the nucleoplasm, with differential targeting possibly linked to mitosis type.

Conclusions:

  • Proteasome localization within the nucleus is a dynamic and regulated process.
  • Mechanisms exist for targeting large proteolytic machines to specific nuclear sites.
  • A model for intranuclear assembly of the 26S proteasome holoenzyme is proposed, offering insights into its functional regulation.