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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

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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 Export

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Related Experiment Video

Updated: Jun 20, 2026

Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy

Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy

Published on: January 7, 2019

The CCR4-NOT complex physically and functionally interacts with TRAMP and the nuclear exosome.

Nowel Azzouz¹, Olesya O Panasenko, Geoffroy Colau

¹Department of Microbiology and Molecular Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland.

|August 27, 2009

Summary

The Ccr4-Not complex plays a crucial role in nuclear RNA degradation by interacting with the nuclear exosome and TRAMP. This finding links nuclear and cytoplasmic RNA processing pathways.

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Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy

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Area of Science:

Molecular Biology
RNA Metabolism
Yeast Genetics

Background:

The Ccr4-Not complex is a conserved multi-protein assembly involved in transcription and mRNA degradation.
While its cytoplasmic role in mRNA decay is established, its nuclear function in RNA degradation remained unclear.

Purpose of the Study:

To investigate the role of the Ccr4-Not complex in nuclear RNA metabolism.
To determine if the Ccr4-Not complex influences the turnover of nuclear non-coding RNAs.

Main Methods:

Analysis of mis-processed and polyadenylated snoRNAs in yeast mutants.
Co-purification studies to assess physical interactions between Ccr4-Not, exosome, and TRAMP components.
Assessing the impact of mutations on complex integrity and protein associations.

Main Results:

The Ccr4-Not complex is essential for regulating the levels of nuclear non-coding RNAs.
Physical interactions were demonstrated between Ccr4-Not, the nuclear exosome, and the TRAMP complex.
The Ccr4-Not complex is important for the integrity of exosome-containing complexes and Mtr4 helicase association.

Conclusions:

The Ccr4-Not complex acts as a platform facilitating interactions between the nuclear exosome and TRAMP.
This study establishes a novel link between the Ccr4-Not complex and nuclear RNA degradation pathways.