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Nuclear Export of mRNA

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 mRNA

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

Nuclear Export

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.
NES are of three types- the canonical 10-residue long leucine-rich signal and other...

Regulated mRNA Transport

Regulated mRNA Transport

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...

Regulated mRNA Transport

Regulated mRNA Transport

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...

Nuclear Protein Sorting

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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Related Experiment Video

Updated: Jun 10, 2026

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

Published on: December 4, 2010

Nuclear export of mRNA.

Murray Stewart¹

¹MRC Laboratory of Molecular Biology, Hills Rd., Cambridge CB2 0QH, UK. ms@mrc-lmb.cam.ac.uk

Trends in Biochemical Sciences

|August 20, 2010

Summary

This summary is machine-generated.

Messenger RNA (mRNA) nuclear export, mediated by Mex67-Mtr2, is crucial for gene expression. Remodeling of messenger ribonucleoprotein (mRNP) complexes in the cytoplasm ensures directional transport and prevents nuclear re-entry.

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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

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Area of Science:

Molecular Biology
Cell Biology
Genetics

Background:

Nuclear export of mRNA is the final step in the nuclear phase of gene expression.
This process is tightly linked with transcription and RNA processing.
Messenger ribonucleoprotein (mRNP) complexes form in the nucleus for transport through nuclear pores.

Purpose of the Study:

To elucidate the molecular mechanisms of mRNA nuclear export.
To understand the role of Mex67-Mtr2 and Nab2 in mRNP remodeling.
To detail the contribution of DEAD-box helicases in directional transport.

Main Methods:

Structural biology techniques to visualize complex formation.
Cell biology experiments to study transport dynamics.
Biochemical assays to analyze protein-RNA interactions.

Main Results:

Mex67-Mtr2 is central to mediating mRNA movement through nuclear pores.
Cytoplasmic remodeling of mRNPs, involving protein removal, ensures unidirectional export.
DEAD-box helicases, adaptors, and accessory proteins facilitate mRNP remodeling.

Conclusions:

Understanding mRNA nuclear export requires detailed molecular insights into mRNP remodeling.
Structural and cell biology data are key to deciphering this fundamental cellular process.
The pathway ensures efficient and directional gene expression by controlling mRNA transport.