Global analysis of host-pathogen interactions that regulate early-stage HIV-1 replication

Area of Science:

• Virology
• Molecular Biology
• Biochemistry

Background:

• Human Immunodeficiency Viruses (HIV-1 and HIV-2) depend on host cellular machinery for replication.
• Understanding these virus-host interactions is critical for developing antiviral strategies.

Purpose of the Study:

• To construct a comprehensive host-pathogen biochemical network for HIV-1.
• To identify host factors modulating early stages of HIV-1 infection, including viral DNA synthesis and integration.

Main Methods:

• Genome-wide siRNA screening was employed to identify host factors.
• Human interactome databases were interrogated to build the host-pathogen network.
• Analysis focused on protein complexes involved in ubiquitin conjugation, proteolysis, DNA-damage response, and RNA splicing.

Main Results:

• A network of 213 host cellular factors and 11 HIV-1 proteins was assembled.
• Key protein complexes regulating ubiquitin conjugation, proteolysis, DNA-damage response, and RNA splicing were identified as critical for early HIV-1 infection.
• Over 40 novel factors, including cytoskeletal proteins and nucleic acid-binding proteins, were found to influence HIV-1 DNA synthesis.
• 15 proteins involved in nuclear transport, ubiquitination, and transcription were shown to affect nuclear import and viral DNA integration.

Conclusions:

• A multiscale approach revealed intricate multiprotein virus-host interactions essential for early HIV-1 infection.
• The identified host factors represent potential targets for novel therapeutic interventions against HIV.