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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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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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Nuclear Export of mRNA

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...
Nuclear Export of mRNA02:31

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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...
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...
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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing specific...

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Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Published on: March 1, 2022

Simulation of mRNA diffusion in the nuclear environment.

M R Roussel1, T Tang

  • 1Department of Chemistry and Biochemistry, University of Lethbridge, Lethbridge, Canada. roussel@uleth.ca

IET Systems Biology
|October 9, 2012
PubMed
Summary
This summary is machine-generated.

This study models messenger RNA (mRNA) diffusion in the nucleus, revealing how nuclear structure, like chromatin density and skeletal elements, influences export efficiency to the cytoplasm.

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Last Updated: May 18, 2026

Structure-Based Simulation and Sampling of Transcription Factor Protein Movements along DNA from Atomic-Scale Stepping to Coarse-Grained Diffusion
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Single-Molecule Imaging of Nuclear Transport
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Single-Molecule Imaging of Nuclear Transport

Published on: June 9, 2010

Area of Science:

  • Cell Biology
  • Biophysics
  • Computational Biology

Background:

  • Messenger RNA (mRNA) export from the nucleus to the cytoplasm is crucial for gene expression.
  • The kinetics of mRNA export are influenced by nuclear architecture and intracellular transport mechanisms.

Purpose of the Study:

  • To develop a mathematical model simulating mRNA diffusion within the nucleus.
  • To investigate the impact of nuclear structure, including chromatin and the nuclear skeleton, on mRNA export rates.
  • To identify optimal conditions for efficient mRNA transport to nuclear pores.

Main Methods:

  • Development of a mathematical model for mRNA diffusion.
  • Simulation of mRNA movement influenced by chromatin confinement and nuclear skeletal elements.
  • Analysis of export time distributions under various nuclear structural configurations.

Main Results:

  • Dense chromatin layers can accelerate mRNA export by reducing diffusion volume.
  • Anisotropic transport systems can enhance mRNA export efficiency.
  • Optimal ratios of anisotropy and transport layer depth exist for rapid mRNA export.

Conclusions:

  • Nuclear structure plays a significant role in regulating mRNA export kinetics.
  • Chromatin density and anisotropic transport are key factors influencing export efficiency.
  • Mathematical modeling provides insights into optimizing mRNA export pathways.