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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.
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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...
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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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Related Experiment Video

Updated: May 6, 2026

Identification of Nucleolar Factors During HIV-1 Replication Through Rev Immunoprecipitation and Mass Spectrometry
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HIV-1 Rev function and RNA nuclear-cytoplasmic export.

Alan Cochrane1

  • 1Department of Molecular Genetics, University of Toronto, Toronto, ON, Canada.

Methods in Molecular Biology (Clifton, N.J.)
|October 26, 2013
PubMed
Summary

Human immunodeficiency virus type 1 (HIV-1) and human T-lymphotropic virus type 1 (HTLV-1) require Rev and Rex proteins to export unspliced viral mRNAs. This work details methods to evaluate Rev/Rex function in viral gene expression and protein/mRNA localization.

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Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • Human immunodeficiency virus type 1 (HIV-1) and human T-lymphotropic virus type 1 (HTLV-1) must export incompletely spliced messenger RNAs (mRNAs) to propagate.
  • Host cellular mechanisms typically prevent the nuclear-cytoplasmic export of incompletely processed mRNAs.
  • Viral proteins Rev (for HIV-1) and Rex (for HTLV-1) evolved to overcome these host restrictions.

Purpose of the Study:

  • To describe methodologies for evaluating the function of viral export proteins Rev and Rex.
  • To provide a framework for assessing viral gene expression and nuclear-cytoplasmic transport dynamics.

Main Methods:

  • Assessing the impact of Rev/Rex on viral gene expression.
  • Monitoring the nucleocytoplasmic trafficking of Rev/Rex proteins.
  • Analyzing the subcellular localization of viral mRNAs.

Main Results:

  • Established procedures allow for the comprehensive evaluation of Rev/Rex function.
  • These methods enable detailed analysis of viral mRNA export pathways.
  • The study provides a toolkit for dissecting critical steps in retroviral replication.

Conclusions:

  • The described procedures offer a robust approach to studying viral mRNA export mechanisms.
  • Understanding Rev/Rex function is crucial for developing antiviral strategies.
  • This work facilitates further research into host-pathogen interactions during retroviral infection.