Related Experiment Video
Updated: Jun 19, 2026
09:16
Analysis of RNA Processing Reactions Using Cell Free Systems: 3' End Cleavage of Pre-mRNA Substrates in vitro
Published on: May 3, 2014
Mammalian pre-mRNA 3' end processing factor CF I m 68 functions in mRNA export
Marc-David Ruepp1, Chiara Aringhieri, Silvia Vivarelli
1Institute of Cell Biology, University of Bern, CH-3012 Bern, Switzerland.
Molecular Biology of the Cell
|October 30, 2009
Summary
The pre-mRNA processing factor CF I(m)68 is crucial for mRNA export from the nucleus. This protein shuttles between cellular compartments and interacts with export machinery, facilitating efficient gene expression.
Area of Science:
- Molecular Biology
- Cell Biology
- Gene Expression
Background:
- Nuclear export of messenger RNA (mRNA) is essential for gene expression and involves packaging into ribonucleoprotein complexes.
- A functional link between mRNA 3' end formation and nuclear export is suggested, but the precise molecular mechanisms remain unclear.
Purpose of the Study:
- To investigate the role of the pre-mRNA 3' end processing factor CF I(m)68 in mRNA nuclear export.
- To elucidate the mechanism by which CF I(m)68 influences mRNA export and its interaction with export pathways.
Main Methods:
- Utilized mammalian cell culture systems.
- Employed RNA interference (RNAi) for gene silencing.
- Performed co-immunoprecipitation to study protein interactions.
- Tracked mRNA export using reporter assays and endogenous mRNA analysis.
- Investigated protein localization via cellular fractionation and microscopy.
Main Results:
- CF I(m)68 was identified as a novel stimulator of mRNA export.
- CF I(m)68 shuttles between the nucleus and cytoplasm in a transcription-dependent manner.
- CF I(m)68 interacts with the mRNA export receptor NXF1/TAP and promotes the export of reporter and endogenous mRNAs.
- Silencing CF I(m)68 leads to mRNA accumulation in the nucleus.
- CF I(m)68 associates with 80S ribosomes, suggesting a role in early cytoplasmic mRNA remodeling.
Conclusions:
- CF I(m)68 plays a significant role in facilitating mRNA export from the nucleus.
- CF I(m)68 acts as an adaptor protein, linking pre-mRNA processing to the mRNA export machinery via interaction with NXF1/TAP.
- These findings reveal a new function for a pre-mRNA processing factor in regulating gene expression through mRNA export.
Related Concept Videos
02:01pre-mRNA Processing
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
02:01Pre-mRNA Processing
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a “cap” to the 5’ end of the growing transcript. In this process, a 5’ phosphate is replaced by modified guanosine that has a methyl group attached to it (7-Methyl guanosine). This 5’ cap helps the...
01:35Pre-mRNA Processing: Modification of pre-mRNA Ends
In eukaryotic cells, transcripts made by RNA polymerase are modified and processed before exiting the nucleus. Unprocessed RNA is called precursor mRNA or pre-mRNA to distinguish it from mature mRNA.
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
Once about 20-40 ribonucleotides have been joined together by RNA polymerase, a group of enzymes adds a cap to the 5' end of the growing transcript. In this process, a 5' phosphate is replaced by modified guanosine that has a methyl group attached (7-methyl guanosine). This 5' cap helps the cell...
02:22Regulated 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...
02:22Regulated 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...
02:31Nuclear 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...