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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 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...

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...

Regulation of Expression at Multiple Steps

Regulation of Expression at Multiple Steps

The gene expression in cells is regulated at different stages: (i) transcription, (ii) RNA processing, (iii) RNA localization, and (iv) translation. Transcriptional regulation is mediated by regulatory proteins such as transcription factors, activators, or repressors—these control gene expression by initiating or inhibiting the transcription of genes. Once a precursor or pre-mRNA is produced, it undergoes post-transcriptional modification, including 5' capping, splicing, and the addition of a...

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Related Experiment Video

Updated: May 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

Mapping interactions between mRNA export factors in living cells.

I-Fang Teng¹, Stuart A Wilson

¹Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield, United Kingdom.

|July 5, 2013

Summary

The TREX complex facilitates mRNA export by interacting with Nxf1. This study maps TREX assembly sites near nuclear speckles, revealing close coupling between mRNA processing and export.

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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

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Published on: December 4, 2010

Method for the Isolation and Identification of mRNAs, microRNAs and Protein Components of Ribonucleoprotein Complexes from Cell Extracts using RIP-Chip

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Visualization of Endoplasmic Reticulum Localized mRNAs in Mammalian Cells

Visualization of Endoplasmic Reticulum Localized mRNAs in Mammalian Cells

Published on: December 17, 2012

Area of Science:

Molecular Biology
Cell Biology
Biochemistry

Background:

The TREX complex is crucial for coupling mRNA processing with cytoplasmic export.
TREX serves as a platform for the mRNA export receptor Nxf1.
The precise nuclear locations for TREX assembly and Nxf1 recruitment remain largely unknown.

Purpose of the Study:

To spatially map the assembly sites of the TREX complex and the recruitment of Nxf1 within living cells.
To investigate the relationship between TREX complex formation and mRNA biogenesis.

Main Methods:

Utilized sensitized emission Förster resonance energy transfer (FRET) and fluorescence lifetime imaging (FLIM)-FRET.
Visualized interactions between TREX subunits (Alyref, Chtop) and Nxf1 in real-time within living cells.

Main Results:

Identified prominent nuclear speckle-associated regions as key sites for TREX complex assembly.
Demonstrated that Nxf1 is recruited to TREX at these assembly sites, forming export-competent messenger ribonucleoprotein (mRNP) particles.
Highlighted the spatial proximity of TREX assembly to sites of transcription, splicing, and exon junction complex formation.

Conclusions:

mRNA export factor assembly is spatially organized within the nucleus, closely linked to mRNA processing.
Nuclear speckles are important hubs for the biogenesis of export-competent mRNPs.
The findings provide insights into the coordinated regulation of mRNA metabolism and export.