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Nuclear Export01:42

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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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Updated: May 23, 2025

Detection of Viral RNA by Fluorescence in situ Hybridization FISH
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Structural Plasticity of RRE Stem-Loop II Modulates Nuclear Export of HIV-1 RNA.

Manju Ojha1, Lucia Hudson1, Amanda Photenhauer2

  • 1Department of Chemistry and Biochemistry, University of Maryland Baltimore County; Baltimore, MD, USA.

Biorxiv : the Preprint Server for Biology
|March 10, 2025
PubMed
Summary
This summary is machine-generated.

The HIV-1 Rev Response Element (RRE) RNA shows structural flexibility, influencing viral RNA export. Targeting specific RRE conformations may lead to new anti-HIV drugs.

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Area of Science:

  • Structural biology
  • Virology
  • Molecular biology

Background:

  • The Rev Response Element (RRE) is essential for HIV-1 nuclear RNA export.
  • Understanding RRE structure-function relationships is critical for HIV-1 pathogenesis.
  • Limited structural data exists for the RRE-Rev interaction.

Purpose of the Study:

  • To elucidate the structural plasticity of the RRE stem-loop II.
  • To investigate how RRE structural dynamics influence Rev binding and function.
  • To provide a basis for developing novel anti-HIV therapeutics.

Main Methods:

  • X-ray crystallography to determine RRE stem-loop II conformations.
  • Negative-staining electron microscopy for structural visualization.
  • Molecular dynamics simulations to analyze RNA dynamics.
  • In vitro Rev-binding and in vivo Rev-activity assays with mutant RREs.

Main Results:

  • Identified two distinct conformations of the RRE stem-loop II.
  • Demonstrated significant structural plasticity in the three-way junction RNA.
  • Showed that RRE stem-loop II structural plasticity modulates Rev binding and oligomerization.
  • Validated the role of specific conformations in Rev-mediated nuclear export.

Conclusions:

  • RRE structural plasticity is a key regulatory mechanism for HIV-1 RNA nuclear export.
  • Targeting specific RRE conformations offers a potential strategy for anti-HIV drug development.
  • This study provides a framework for understanding dynamics-based regulation in viral RNA processing.