Small-Molecule CD4-Mimics: Structure-Based Optimization of HIV-1 Entry Inhibition

Area of Science:

• Virology
• Medicinal Chemistry
• Structural Biology

Background:

• The envelope glycoprotein gp120 of human immunodeficiency virus (HIV) is a key target for antiviral therapies.
• The Phe43 cavity of gp120 is a critical site for viral entry and a potential target for small-molecule inhibitors.

Purpose of the Study:

• To optimize small-molecule ligands targeting the Phe43 cavity of HIV-1 gp120.
• To evaluate the biological activity, binding mode, and selectivity of novel CD4 mimics.

Main Methods:

• Computational, thermodynamic, and crystallographic data were used for ligand optimization.
• Biological evaluation assessed HIV-1 entry inhibition, potency, and neutralization breadth.
• Thermodynamic and crystallographic studies characterized the binding mode of the inhibitors.

Main Results:

• A series of small-molecule ligands targeting the Phe43 cavity of gp120 were successfully optimized.
• Compounds 4-7, acting as CD4 mimics, demonstrated significantly higher potency and broader neutralization of HIV-1 entry compared to previous compounds.
• The novel inhibitors maintained high selectivity for the target virus.

Conclusions:

• Optimized small-molecule CD4 mimics are potent inhibitors of HIV-1 entry.
• These compounds represent promising candidates for the development of new anti-HIV therapeutics.
• Understanding the binding mode provides insights for further drug design.