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Human retroviral host restriction factors APOBEC3G and APOBEC3F localize to mRNA processing bodies

Michael J Wichroski1, G Brett Robb, Tariq M Rana

  • 1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts, USA.

Plos Pathogens
|May 16, 2006
PubMed

Insights

The antiviral protein APOBEC3G localizes to P-bodies, crucial for mRNA regulation. This finding links innate immunity and P-bodies, suggesting APOBEC3G and APOBEC3F restrict HIV-1 replication within these compartments.

Area of Science:

  • * Molecular Biology
  • * Virology
  • * Cellular Biology

Background:

  • * APOBEC3G is a host factor that inhibits retroviral and hepatitis B virus replication.
  • * Understanding APOBEC3G's mechanism requires investigating its subcellular localization.
  • * P-bodies are cytoplasmic sites involved in mRNA regulation.

Purpose of the Study:

  • * To determine the subcellular localization of APOBEC3G.
  • * To elucidate the mechanism by which APOBEC3G restricts retroviral replication.
  • * To explore the role of P-bodies in APOBEC3G's antiviral activity.

Main Methods:

  • * Biochemical analysis of APOBEC3G localization.
  • * Investigation of APOBEC3G's association with other P-body proteins.
  • * Comparative analysis of APOBEC3 family members' localization.

Main Results:

  • * APOBEC3G localizes to mRNA processing (P) bodies.
  • * APOBEC3G forms ribonucleoprotein complexes with key P-body proteins involved in translation and gene silencing.
  • * APOBEC3G and APOBEC3F localize to a common complex in P-bodies, correlating with anti-HIV-1 activity.
  • * HIV-1 Vif may restrict APOBEC3G/APOBEC3F localization to P-bodies.

Conclusions:

  • * APOBEC3G and APOBEC3F function within P-bodies to restrict HIV-1 replication.
  • * A novel link exists between innate antiviral immunity and P-body function.
  • * P-body localization is critical for the antiviral activity of APOBEC3G and APOBEC3F against retroviruses.

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