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Updated: Jul 10, 2026

Amplification of Near Full-length HIV-1 Proviruses for Next-Generation Sequencing
Published on: October 16, 2018
Analysis of human immunodeficiency virus matrix domain replacements
Isabel Scholz1, Amelia Still, Tenzin Choesang Dhenub
1Department of Molecular Microbiology and Immunology, Oregon Health & Sciences University, Portland, OR, USA.
The matrix (MA) domain of HIV-1 Gag is crucial for viral assembly. While alternative membrane-binding domains can facilitate virus-like particle release, they impair infectious virus production and core formation.
Area of Science:
- Virology
- Molecular Biology
- Structural Biology
Background:
- The matrix (MA) domain of human immunodeficiency virus type 1 (HIV-1) Gag protein is essential for targeting Gag to the plasma membrane during viral assembly.
- MA facilitates the incorporation of envelope proteins and proper virion formation.
Purpose of the Study:
- To investigate the specific requirements of the MA membrane-binding domain (MBD) in HIV-1 assembly and replication.
- To determine if alternative MBDs can substitute for MA function in viral particle production.
Main Methods:
- Replaced the native MA domain of HIV-1 Gag with alternative MBDs from AKT protein kinase, phospholipase C delta1, and protein kinase Cgamma.
- Analyzed the assembly and release of virus-like particles (VLPs) using these chimeric proteins.
- Assessed viral infectivity, Gag precursor processing, and GagPol cleavage within virions.
Main Results:
- Alternative MBDs, including pleckstrin homology domains and a cysteine-rich binding domain, successfully directed VLP assembly and release.
- VLPs produced with alternative MBDs were not infectious.
- Reduced processing of Gag precursors and accumulation of Pol-derived intermediates were observed in virions.
Conclusions:
- The HIV-1 assembly machinery exhibits flexibility in membrane association mechanisms.
- While alternative MBDs can promote VLP release, they disrupt the proper processing and maturation required for infectious virus production.
- Specific interactions mediated by the native MA domain are critical for generating infectious HIV-1 particles.
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