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Related Experiment Videos

Relationship between human immunodeficiency virus type 1 Gag multimerization and membrane binding.

A Ono1, D Demirov, E O Freed

  • 1Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20892-0460, USA.

Journal of Virology
|May 9, 2000
PubMed
Summary
This summary is machine-generated.

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The human immunodeficiency virus type 1 (HIV-1) Gag precursor binds efficiently to membranes even without strong Gag-Gag interactions. This suggests matrix and capsid domains are key for initial membrane binding during virus assembly.

Area of Science:

  • Virology
  • Molecular Biology
  • Structural Biology

Background:

  • The human immunodeficiency virus type 1 (HIV-1) Gag precursor, Pr55(Gag), drives viruslike particle assembly and release.
  • Membrane binding and Gag-Gag multimerization are critical for HIV-1 assembly but their underlying domains and relationships are not fully understood.

Purpose of the Study:

  • To investigate the domains responsible for HIV-1 Gag membrane binding and multimerization.
  • To elucidate the relationship between membrane binding and Gag-Gag interactions during virus assembly.

Main Methods:

  • Analysis of C-terminally truncated HIV-1 Gag mutants (MAstop, CA146stop, p41stop, p43stop, NC35stop) in vivo.
  • Assessment of viruslike particle assembly, release, and copackaging with full-length Gag.
  • Membrane flotation centrifugation to determine membrane-binding properties.

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Main Results:

  • Truncated Gag incorporation increased with extension from CA146 to NC35, indicating multiple Gag multimerization sites.
  • The MA-only fragment showed reduced membrane binding compared to full-length Gag.
  • The CA146 mutant (matrix and N-terminal capsid domains) exhibited membrane-binding levels similar to full-length Pr55(Gag).

Conclusions:

  • Efficient HIV-1 Gag membrane binding can occur independently of strong Gag-Gag interaction domains.
  • The matrix and N-terminal capsid domains of Gag are sufficient for effective steady-state membrane binding.
  • These findings refine our understanding of the initial steps in HIV-1 particle formation.