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Updated: Sep 29, 2025

Visualization of HIV-1 Gag Binding to Giant Unilamellar Vesicle GUV Membranes
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Relationship between HIV-1 Gag Multimerization and Membrane Binding.

Christopher Sumner1, Akira Ono1

  • 1Department of Microbiology and Immunology, University of Michigan, Ann Arbor, MI 48109, USA.

Viruses
|March 26, 2022
PubMed
Summary
This summary is machine-generated.

HIV-1 Gag protein assembly at the plasma membrane involves the MA domain

Keywords:
GagHIV-1capsidgenomic RNA bindingmatrixmembrane bindingmultimerizationnucleocapsidparticle assemblytRNA binding

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Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • HIV-1 viral particle assembly is directed by the Gag polyprotein.
  • Gag's selective plasma membrane association is crucial for viral assembly.
  • The MA domain of Gag is traditionally considered key for membrane binding.

Purpose of the Study:

  • To review mechanisms of Gag membrane binding via the MA domain.
  • To examine the role of Gag multimerization (CA and NC domains) in assembly.
  • To explore the interplay between Gag multimerization and MA-mediated membrane binding.

Main Methods:

  • Review of existing literature on HIV-1 Gag protein interactions.
  • Analysis of molecular mechanisms governing Gag-membrane association.
  • Examination of Gag multimerization's influence on membrane binding.

Main Results:

  • MA domain binds plasma membrane phospholipids like PI(4,5)P2 via its HBR.
  • tRNA binding to MA HBR prevents non-specific membrane association.
  • Gag multimerization, driven by CA-CA and NC-RNA interactions, enhances MA-mediated membrane binding.

Conclusions:

  • Gag membrane binding is regulated by MA domain interactions and Gag multimerization.
  • Multimerization enhances Gag's plasma membrane association, facilitating viral assembly.
  • Understanding these intertwined functions is key to HIV-1 replication insights.