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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...

Nuclear Export

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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...

Nucleic Acid Structure

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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms a 5′ to 3′ phosphodiester linkage.
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The basic structure of RNA consists of a five-carbon sugar and one of four nitrogenous bases. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
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Related Experiment Video

Updated: Jun 16, 2026

Large-scale Production of Recombinant RNAs on a Circular Scaffold Using a Viroid-derived System in Escherichia coli

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Monomethylated cap structures facilitate RNA export from the nucleus.

J Hamm¹, I W Mattaj

¹European Molecular Biology Laboratory, Heidelberg, Federal Republic of Germany.

|October 5, 1990

Summary

The 5’ cap structure of RNA, specifically the m7GpppN form, acts as a nuclear export signal. This signal facilitates the transport of RNA from the nucleus to the cytoplasm in Xenopus oocytes.

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Analysis of mRNA Nuclear Export Kinetics in Mammalian Cells by Microinjection

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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

Area of Science:

Molecular Biology
Cell Biology
Gene Expression

Background:

Nuclear export of RNA is a critical step in gene expression.
The role of RNA cap structures in nuclear export is not fully understood.
Xenopus oocytes provide a valuable model system for studying nuclear transport.

Purpose of the Study:

To investigate the role of RNA cap structures in nuclear export.
To determine if specific cap structures signal for RNA export from the nucleus.

Main Methods:

Analysis of U1 small nuclear RNAs (snRNAs) synthesized by RNA polymerase II and III in Xenopus oocytes.
Inhibition studies using the cap analog m7GpppG to assess export.
Examination of messenger RNA (mRNA) export rates with different cap structures (monomethylguanosine vs. hypermethylated).
Analysis of a mutant precursor mRNA export with altered cap structures.

Main Results:

RNA polymerase II-transcribed U1 snRNAs were exported, while RNA polymerase III-transcribed U1 snRNAs remained nuclear.
The cap analog m7GpppG inhibited the export of polymerase II-transcribed RNAs.
Spliced mRNAs with monomethylguanosine caps were exported rapidly; hypermethylated caps delayed export.
A mutant precursor mRNA with a hypermethylated cap also showed delayed export.

Conclusions:

The m7GpppN cap structure serves as a signal for nuclear RNA export.
Differential RNA processing and cap structures influence nuclear export efficiency.
Cap-dependent mechanisms regulate the transport of various RNA species.