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Related Concept Videos

Nuclear Export of mRNA02:31

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 Sorting01:34

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...
Nuclear Localization Signals and Import01:46

Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
Nuclear Export01:42

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...
Directionality of Nuclear Transport01:42

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...
Nuclear Export of mRNA02:31

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...

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Related Experiment Video

Updated: May 7, 2026

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
11:32

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

Published on: December 4, 2010

RNP export by nuclear envelope budding.

Emily M Hatch1, Martin W Hetzer

  • 1Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.

Cell
|May 15, 2012
PubMed
Summary
This summary is machine-generated.

Muscle cells utilize a novel mRNA export pathway, bypassing nuclear pore complexes. Ribonucleoprotein complexes bud through the nuclear membrane for neuromuscular junction formation.

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Related Experiment Videos

Last Updated: May 7, 2026

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection
11:32

Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

Published on: December 4, 2010

Small-scale Nuclear Extracts for Functional Assays of Gene-expression Machineries
08:05

Small-scale Nuclear Extracts for Functional Assays of Gene-expression Machineries

Published on: June 27, 2012

Isolation of Cognate RNA-protein Complexes from Cells Using Oligonucleotide-directed Elution
10:53

Isolation of Cognate RNA-protein Complexes from Cells Using Oligonucleotide-directed Elution

Published on: January 16, 2017

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Neuroscience

Background:

  • The nuclear pore complex (NPC) is the established route for messenger RNA (mRNA) export from the nucleus to the cytoplasm.
  • Understanding mRNA transport mechanisms is crucial for gene expression regulation and cellular function.

Discussion:

  • Speese et al. reveal a non-canonical mRNA export pathway in muscle cells.
  • This alternative route involves ribonucleoprotein (RNP) complexes budding through the nuclear envelope.
  • This mechanism is specifically linked to the formation of neuromuscular junctions.

Key Insights:

  • Identified a novel pathway for mRNA export independent of nuclear pore complexes.
  • Demonstrated that specific ribonucleoprotein complexes utilize membrane budding for nuclear envelope transit.
  • This process is essential for neuromuscular junction development.

Outlook:

  • Further investigation into the molecular machinery governing this budding process.
  • Exploring the prevalence of this pathway in other cell types and biological contexts.
  • Understanding the implications for muscle development and disease.