The Human Immunodeficiency Virus Type 1 Budding Machinery: Deconstructing the Endosomal Sorting Complexes Required...

Area of Science:

• Molecular virology
• Cell biology
• Structural biology

Background:

• HIV-1 virion budding relies on the host's endosomal sorting complexes required for transport (ESCRT) machinery.
• The viral Gag polyprotein is central to recruiting ESCRT components for efficient virus release.

Purpose of the Study:

• To synthesize current molecular and structural knowledge of ESCRT recruitment by HIV-1 Gag.
• To explore the roles of specific motifs and pathways in viral egress.
• To evaluate ESCRT's link to viral persistence, immune evasion, and therapy.

Main Methods:

• Comprehensive review of existing literature on ESCRT-HIV-1 interactions.
• Analysis of molecular and structural data on Gag-ESCRT complex formation.
• Evaluation of studies on ubiquitin signaling, membrane composition, and cellular context.

Main Results:

• HIV-1 Gag utilizes PTAP and YPXNL motifs to recruit Tsg101 (ESCRT-I) and ALIX, initiating ESCRT-III polymerization and VPS4 ATPase activity for membrane scission.
• ESCRT recruitment pathways show redundancy and adaptability, modulated by ubiquitin signaling and cellular factors.
• ESCRT's role extends to HIV-1 persistence, immune evasion, and therapeutic susceptibility.

Conclusions:

• An integrated framework for ESCRT-dependent HIV-1 egress is established.
• Understanding these interactions reveals potential targets for antiviral interventions.
• Further research is needed on ESCRT-III dynamics, VPS4 remodeling, and scission regulation.