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A Restriction Enzyme Based Cloning Method to Assess the In vitro Replication Capacity of HIV-1 Subtype C Gag-MJ4 Chimeric Viruses
Published on: August 31, 2014
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Sec24C is an HIV-1 host dependency factor crucial for virus replication
Stephanie V Rebensburg1, Guochao Wei1, Ross C Larue2
1Division of Infectious Diseases, University of Colorado Anschutz Medical Campus, Aurora, CO, USA.
Nature Microbiology
|March 2, 2021
Summary
Sec24C is a host factor essential for human immunodeficiency virus 1 (HIV-1) infection. It binds to HIV-1 capsid lattices, enhancing viral trafficking, core stability, and infectivity for productive infection.
Area of Science:
- Virology
- Molecular Biology
- Structural Biology
Background:
- Early human immunodeficiency virus 1 (HIV-1) lifecycle events, including post-entry trafficking, uncoating, and nuclear import, are not well understood due to limited knowledge of virus-host interactions.
- Understanding these interactions is crucial for developing effective antiviral strategies.
Purpose of the Study:
- To identify cellular binding partners of HIV-1 capsid lattices using mass spectrometry-based proteomics.
- To investigate the role of identified host factors in HIV-1 infection and replication.
Main Methods:
- Mass spectrometry-based proteomics to identify HIV-1 capsid binding partners.
- Gene deletion and complementation in Jurkat cells to assess Sec24C's role in infection.
- Downregulation of Sec24C in HeLa cells to evaluate its impact on HIV-1 core stability and replication steps.
- Live-cell microscopy to track HIV-1 core trafficking in the cytoplasm.
- Biochemical assays and crystal structure analysis to determine the interaction between Sec24C and HIV-1 capsid hexamers.
Main Results:
- Sec24C was identified as a host dependency factor for HIV-1.
- Sec24C facilitates HIV-1 infection and enhances viral spreading.
- Downregulation of Sec24C reduced HIV-1 core stability, reverse transcription, nuclear import, and infectivity.
- Sec24C directly interacts with hexameric HIV-1 capsid lattices.
- Structural analysis revealed a conserved capsid-binding motif in Sec24C.
Conclusions:
- Sec24C is a critical host factor that binds to HIV-1 capsid lattices, promoting viral trafficking and infection.
- The findings highlight the importance of virus-host interactions in different cellular compartments for productive HIV-1 infection.
- Conserved capsid-binding motifs in host proteins suggest a common mechanism for viral manipulation of cellular transport pathways.
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