Structure, Function, and Interactions of the HIV-1 Capsid Protein

Area of Science:

• Virology
• Molecular Biology
• Structural Biology

Background:

• The capsid (CA) protein of human immunodeficiency virus type 1 (HIV-1) is a critical structural component of the virion.
• CA plays essential roles in multiple stages of the HIV-1 life cycle, including viral entry, nuclear import, and maturation.

Purpose of the Study:

• To elucidate the multifaceted roles of the HIV-1 CA protein in the viral life cycle.
• To highlight the therapeutic potential of CA as a target for novel HIV-1 inhibitors.

Main Methods:

• The study reviews existing literature on HIV-1 CA structure and function.
• Analysis of CA interactions with host cell factors (e.g., FEZ1, BICD2, NUP153, NUP358, TNPO3, CPSF-6).
• Examination of CA's role in Gag polyprotein processing and capsid core formation.

Main Results:

• CA shields the viral complex from cellular restriction factors.
• CA facilitates nuclear import by interacting with host adaptor proteins and nuclear pore components.
• CA is essential for the formation of the mature fullerene cone capsid core, comprising CA hexamers and pentamers.

Conclusions:

• The HIV-1 CA protein is indispensable for viral replication, mediating key steps from entry to maturation.
• The structural and functional significance of CA underscores its potential as a prime target for developing effective HIV-1 therapeutics.