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Related Concept Videos

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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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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Nuclear Protein Sorting01:34

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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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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...
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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
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An agent-based model for mRNA export through the nuclear pore complex.

Mohammad Azimi1, Evgeny Bulat2, Karsten Weis3

  • 1Molecular Cell Biomechanics Laboratory, Departments of Bioengineering and Mechanical Engineering, Graduate Program in Chemical Biology, Berkeley, Berkeley, CA 94720.

Molecular Biology of the Cell
|September 26, 2014
PubMed
Summary
This summary is machine-generated.

Messenger RNA (mRNA) export from the nucleus is vital for protein production. This study reveals export efficiency depends on export receptor density and identifies a rate-limiting step within the nuclear basket during mRNA transport.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biophysics

Background:

  • Messenger RNA (mRNA) export from the nucleus is a fundamental process for eukaryotic gene expression.
  • Key aspects of mRNA export, including the role of export receptors and the location of transport rate-limiting steps, remain poorly understood.
  • The density and distribution of export receptors on mRNA influence transport dynamics.

Purpose of the Study:

  • To investigate the impact of export receptor density and distribution on mRNA export dynamics.
  • To identify the rate-limiting step in the mRNA nuclear export pathway.
  • To model mRNA export using biophysical and biochemical parameters.

Main Methods:

  • Development of a three-dimensional, coarse-grained, agent-based model for mRNA export.
  • Simulation of mRNA export in the nanosecond timescale.
  • Incorporation of previously published biophysical and biochemical parameters of mRNA export.

Main Results:

  • mRNA export efficiency is sensitive to the number and distribution of transport receptors coating the mRNA.
  • A rate-limiting step was identified within the nuclear basket, potentially involving mRNA reconfiguration for channel entry.
  • Single-point mRNA localization may not accurately capture the temporal dynamics of nuclear pore complex transit.

Conclusions:

  • The density and arrangement of export receptors critically influence mRNA nuclear export.
  • mRNA reconfiguration in the nuclear basket represents a potential bottleneck in the export process.
  • Experimental designs for studying mRNA transport dynamics should consider the limitations of single-point localization methods.