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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...

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...

Directionality of Nuclear Transport

Directionality of Nuclear Transport

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...

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...

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Related Experiment Video

Updated: May 30, 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 dynamics of RNA-protein complexes.

David Grünwald¹, Robert H Singer, Michael Rout

¹Delft University of Technology, Faculty of Applied Sciences, Kavli Institute of NanoScience, Department of Bionanoscience, 2628 CJ Delft, The Netherlands.

|July 22, 2011

Summary

The central dogma describes DNA to RNA to protein flow, but the nuclear envelope poses a barrier. Recent single-molecule imaging reveals new insights into nuclear RNA export mechanisms.

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Last Updated: May 30, 2026

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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Published on: September 29, 2012

Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC

Monitoring Protein-RNA Interaction Dynamics In Vivo at High Temporal Resolution Using χCRAC

Published on: May 9, 2020

Area of Science:

Molecular Biology
Cell Biology
Genetics

Background:

The central dogma of molecular biology outlines genetic information flow from DNA to RNA to proteins.
In eukaryotic cells, the nuclear envelope acts as a barrier, regulating molecular transport via nuclear-pore complexes.
The export of RNA from the nucleus is a critical but poorly understood step in this information flow.

Purpose of the Study:

To review recent advancements in understanding RNA export from the nucleus.
To present current models explaining the mechanisms of nuclear RNA export.

Main Methods:

Review of recent scientific literature.
Analysis of single-molecule imaging studies.
Exploration of theoretical models for RNA export.

Main Results:

Single-molecule imaging techniques have provided novel insights into RNA export.
The nuclear envelope and nuclear-pore complexes play a key regulatory role.
Complex mechanisms govern the passage of RNA out of the nucleus.

Conclusions:

Understanding RNA export is crucial for comprehending eukaryotic gene expression.
Emerging imaging technologies are key to unraveling these complex transport processes.
Further research is needed to fully elucidate the models of RNA export.