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Retroviral restriction factor TRIM5alpha is a trimer.

Claudia C Mische1, Hassan Javanbakht, Byeongwoon Song

  • 1Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute, Division of AIDS, Harvard Medical School, Boston, Massachusetts 02115, USA.

Journal of Virology
|October 29, 2005
PubMed
Summary

The retrovirus restriction factor TRIM5alpha forms trimers, which is crucial for its antiviral activity. This trimerization enables TRIM5alpha to bind effectively to retroviral capsids, inhibiting viral entry.

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Area of Science:

  • Molecular biology
  • Virology
  • Structural biology

Background:

  • The TRIM5alpha protein is a key cellular defense mechanism against retroviral infections.
  • TRIM5alpha functions by recognizing and binding to the viral capsid shortly after viral entry into the host cell.

Purpose of the Study:

  • To investigate the oligomeric state of the TRIM5alpha protein.
  • To determine the structural domains involved in TRIM5alpha oligomerization.
  • To elucidate the mechanism underlying the dominant-negative activity of TRIM5alpha mutants.

Main Methods:

  • Protein biochemistry techniques to study TRIM5alpha oligomerization.
  • Site-directed mutagenesis to assess the role of specific domains (coiled-coil, B30.2(SPRY), RING, B-box 2).
  • Analysis of wild-type and mutant TRIM5alpha protein interactions.

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Main Results:

  • TRIM5alpha protein oligomerizes into trimers.
  • The coiled-coil and B30.2(SPRY) domains are essential for trimer formation and stability.
  • A mutant TRIM5alpha lacking RING and B-box 2 domains can form heterotrimers with wild-type TRIM5alpha, explaining its dominant-negative effect.
  • Trimerization likely facilitates TRIM5alpha's interaction with the threefold symmetrical retroviral capsid.

Conclusions:

  • TRIM5alpha functions as a trimer, a quaternary structure critical for its antiviral activity.
  • Understanding TRIM5alpha trimerization provides insights into retroviral capsid recognition and inhibition.
  • The study clarifies the molecular basis of dominant-negative TRIM5alpha mutants.