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P body-associated protein Mov10 inhibits HIV-1 replication at multiple stages

Ryan Burdick1, Jessica L Smith, Chawaree Chaipan

  • 1HIV Drug Resistance Program, National Cancer Institute-Frederick, Viral Mutation Section, Frederick, MD 21702, USA.

Journal of Virology
|July 30, 2010
PubMed

Insights

Mov10 protein potently inhibits human immunodeficiency virus type 1 (HIV-1) replication by affecting multiple stages, including virus production and infectivity. This suggests Mov10 is a key factor in controlling HIV-1.

Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • APOBEC3G (A3G) inhibits HIV-1 replication and localizes to cytoplasmic mRNA-processing bodies (P bodies).
  • The functional significance of A3G's colocalization with P body proteins in HIV-1 replication remains unclear.

Purpose of the Study:

  • To investigate the relationship between HIV-1, A3G, and P bodies.
  • To determine the effect of overexpressing P body marker proteins (Mov10, DCP1a, DCP2) on HIV-1 replication.

Main Methods:

  • Overexpression of P body marker proteins Mov10, DCP1a, and DCP2 in virus producer cells.
  • Analysis of HIV-1 Gag protein levels, virus production, and infectivity.
  • Assessment of Mov10 incorporation into virions and its effect on reverse transcription.
  • Evaluation of the impact of Mov10 and A3G co-overexpression and Mov10 knockdown via siRNA on HIV-1 replication.

Main Results:

  • Mov10 overexpression, but not DCP1a or DCP2, significantly inhibited HIV-1 replication at multiple stages.
  • Mov10 overexpression reduced HIV-1 Gag levels, decreased virus production, and lowered virus infectivity by inhibiting reverse transcription.
  • Both Mov10 and A3G overexpression reduced HIV-1 Gag processing, with additive inhibitory effects.
  • siRNA-mediated knockdown of endogenous Mov10 reduced virus production but did not impact viral infectivity.

Conclusions:

  • Mov10 is a potent inhibitor of HIV-1 replication, acting at multiple stages.
  • Mov10's inhibitory effects on HIV-1 are distinct from those of A3G, suggesting no functional interaction.
  • Endogenous Mov10 plays a role in regulating HIV-1 production but is not essential for viral infectivity.

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