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HIV-1 Mutant Assembly, Processing and Infectivity Expresses Pol Independent of Gag.

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Viruses
|January 8, 2020
PubMed
Summary

HIV-1 Gag-Pol expression was modified using a 2A peptide, creating a new construct. This modification revealed that HIV-1 uses ribosomal frameshifting to control Gag-Pol/Gag expression and viral enzyme packaging for efficient assembly.

Keywords:
GagGag–PolHIV-1Polvirus assemblyvirus processing

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Area of Science:

  • Virology
  • Molecular Biology
  • Retroviral Gene Expression

Background:

  • The pol gene in retroviruses encodes essential enzymes for replication and maturation.
  • Unlike HIV-1's Gag-Pol fusion, ancient foamy viruses express Pol independently.
  • Understanding HIV-1 Gag-Pol expression is crucial for viral assembly and gene expression.

Purpose of the Study:

  • To investigate the role of a "self-cleaving" 2A peptide in mediating independent packaging of HIV-1 Gag and Pol.
  • To analyze the impact of altered Gag-Pol expression on virion production, infectivity, and viral enzyme packaging.
  • To elucidate the molecular mechanisms underlying HIV-1 gene expression and assembly.

Main Methods:

  • Constructing a novel Gag-2A-Pol (G2AP) expression system in HIV-1.
  • Analyzing virion production, density, and infectivity of G2AP compared to wild-type (wt) HIV-1.
  • Evaluating the effect of protease activity and Pol expression levels on virus yields.

Main Results:

  • The G2AP construct produced virions of similar density to wt HIV-1, with Pol packaged independently of Gag.
  • G2AP exhibited significantly reduced infectivity (one-third of wt), attributed partly to Pol packaging defects.
  • Modulating protease activity or Pol expression in the G2AP system led to increased virus yields, suggesting overexpressed Pol and increased protease activity contributed to reduced yields.

Conclusions:

  • HIV-1's gag/pol ribosomal frameshifting mechanism is vital for modulating Gag-Pol/Gag expression and promoting viral enzyme packaging.
  • The 2A peptide system provides insights into independent Pol packaging but highlights the importance of precise expression levels for infectivity.
  • This study clarifies key aspects of HIV-1 gene expression, assembly, and the functional significance of its frameshifting mechanism.