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Related Concept Videos

Regulation of Nuclear Protein Sorting01:45

Regulation of Nuclear Protein Sorting

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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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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.
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Nuclear Export of mRNA02:31

Nuclear Export of mRNA

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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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Nuclear Export01:42

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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Directionality of Nuclear Transport

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Ras-related nuclear protein or Ran is a small G protein that cycles between its GTP and GDP bound states. Ran specific regulators, a Ran GTPase Activating Protein or RanGAP present in the cytosol and a Ran guanine nucleotide exchange factor or RanGEF present inside the nucleus regulate GTP/GDP exchange. A high concentration of GTP inside the cells, in addition to this asymmetric distribution of  Ran-specific regulators, leads to a higher RanGTP concentration inside the nucleus. This...
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Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
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Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy

Published on: November 11, 2025

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Nuclear pore interactions with the genome.

Varun Sood1, Jason H Brickner1

  • 1Department of Molecular Biosciences, Northwestern University, Evanston, IL, United States.

Current Opinion in Genetics & Development
|February 1, 2014
PubMed
Summary
This summary is machine-generated.

Nuclear Pore Proteins (Nups) organize chromatin within the nucleus, influencing gene expression and epigenetic regulation. These proteins interact with DNA to control transcription and chromatin structure, impacting cellular processes.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • The nucleus organizes chromatin into functional compartments.
  • Nuclear Pore Complexes (NPCs) and Nuclear Pore Proteins (Nups) are crucial for chromatin organization and transcriptional regulation at the nuclear periphery.
  • Nups are implicated in diseases like leukemia and viral integration, prompting deeper investigation into their functions.

Purpose of the Study:

  • To elucidate the mechanisms by which Nuclear Pore Proteins (Nups) interact with chromatin.
  • To understand the role of Nups in transcriptional regulation and epigenetic modifications.
  • To explore how Nups contribute to nuclear organization and gene expression.

Main Methods:

  • Investigating Nup-chromatin interactions at the nuclear pore complex and within the nucleoplasm.
  • Analyzing the role of promoter DNA elements and trans-acting factors in guiding Nup-chromatin associations.
  • Examining the effects of Nups on gene expression, chromatin structure, and epigenetic regulation.

Main Results:

  • Nups bind to both active and repressed genes in a regulated manner.
  • Nup interactions with chromatin are mediated by conserved mechanisms involving DNA elements and trans-acting factors.
  • Nups can promote interchromosomal clustering of co-regulated genes.
  • Nups influence gene expression by enhancing transcription, limiting heterochromatin spread, and altering chromatin structure.
  • Nups establish boundary elements and poise repressed genes for reactivation, contributing to epigenetic regulation.

Conclusions:

  • Nups are key regulators of chromatin organization and gene expression within the nucleus.
  • Nup-mediated interactions influence transcriptional activity and epigenetic states.
  • Understanding Nup functions is critical for insights into nuclear organization, gene regulation, and disease mechanisms.