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Related Experiment Videos

CRM1-dependent function of a cis-acting RNA export element.

Ileana Popa1, Matthew E Harris, John E Donello

  • 1Department of Microbiology and Immunology, College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612, USA.

Molecular and Cellular Biology
|March 9, 2002
PubMed
Summary

The woodchuck hepatitis virus posttranscriptional regulatory element (WPRE) typically functions independently of viral proteins. However, this study reveals WPRE utilizes the CRM1-dependent pathway for mRNA export in mammalian cells.

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Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • Viruses utilize cis-acting RNA elements for posttranscriptional processing and export.
  • These elements are often classified based on their reliance on viral or cellular RNA-binding proteins.
  • Viral protein-dependent elements typically use the CRM1 export pathway, while cellular factors are generally CRM1-independent.

Purpose of the Study:

  • To investigate the export pathway utilized by the woodchuck hepatitis virus posttranscriptional regulatory element (WPRE).
  • To determine if WPRE function is dependent on the CRM1 export pathway, contrary to conventional assumptions.

Main Methods:

  • Assessing WPRE function sensitivity to C-terminus of CAN/Nup214 overexpression.
  • Evaluating WPRE activity after treatment with leptomycin B, a CRM1 inhibitor.

Related Experiment Videos

  • Measuring WPRE activity upon CRM1 overexpression.

    • Main Results:

    • WPRE function was sensitive to C-terminus of CAN/Nup214 overexpression and leptomycin B treatment.
    • Overexpression of CRM1 significantly stimulated WPRE activity.
    • These findings indicate a direct role for CRM1 in WPRE-mediated mRNA export.

    Conclusions:

    • The WPRE directs viral messages into a CRM1-dependent mRNA export pathway in somatic mammalian cells.
    • This challenges the conventional view of WPRE functioning in a CRM1-independent manner.
    • CRM1 plays a direct role in the export function of the WPRE.