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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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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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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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Updated: Mar 12, 2026

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

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Structure and Function of the Nuclear Pore Complex Cytoplasmic mRNA Export Platform.

Javier Fernandez-Martinez1, Seung Joong Kim2, Yi Shi3

  • 1Laboratory of Cellular and Structural Biology, The Rockefeller University, New York, NY 10065, USA.

Cell
|November 15, 2016
PubMed
Summary

The Nup82 complex, crucial for mRNA export, has a newly revealed molecular architecture. This structure positions key mRNA remodeling factors directly over the nuclear pore complex (NPC) for efficient export.

Keywords:
Nup4 complexNup82 complexcomputational structural biologycross-linking and mass spectrometryelectron microscopyintegrative structure determinationmRNA exportmRNP remodelingnuclear pore complexsmall-angle X-ray scattering

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Area of Science:

  • Molecular biology
  • Cell biology
  • Structural biology

Background:

  • The Nup82 complex is essential for the final stages of messenger RNA (mRNA) export and remodeling.
  • This complex is a large, conserved assembly located at the cytoplasmic face of the nuclear pore complex (NPC).

Purpose of the Study:

  • To determine the molecular architecture of the native Nup82 complex at subnanometer precision.
  • To understand how the Nup82 complex interacts with the Nup84 complex within the NPC.

Main Methods:

  • Integration of diverse structural data.
  • High-resolution structural analysis of the Nup82 complex.

Main Results:

  • The Nup82 complex comprises two identical multiprotein subunits with distinct configurations.
  • The 14-megadalton (MDa) Nup82-Nup84 complex assembly docks within the NPC's outer ring.
  • This assembly places mRNA export factors and remodeling machinery directly over the NPC's central channel.

Conclusions:

  • The Nup82-Nup84 complex configuration facilitates efficient capture and remodeling of messenger ribonucleoprotein (mRNP) particles.
  • This arrangement ensures immediate processing of exporting mRNPs upon reaching the NPC's cytoplasmic side.
  • The findings refine our understanding of the spatial organization of mRNA export machinery at the NPC.