Critical role for cholesterol in Lassa fever virus entry identified by a novel small molecule inhibitor targeting the...

Area of Science:

• Virology
• Molecular Biology
• Drug Discovery

Background:

• Lassa fever virus (LASV) is a significant public health concern in West Africa.
• LASV infection can lead to severe hemorrhagic fever and irreversible sensorineural hearing loss.

Purpose of the Study:

• To identify the molecular mechanism of LASV entry.
• To discover and characterize a small molecule inhibitor of LASV infection.

Main Methods:

• Utilized a photo-reactive analog of a LASV inhibitor as a molecular probe.
• Identified the inhibitor's target protein using biochemical assays.
• Performed mutational analysis and docking-based modeling to elucidate the binding site.

Main Results:

• Lysosome-associated membrane protein 1 (LAMP1) was identified as the host factor targeted by the inhibitor.
• LAMP1 binds to the LASV glycoprotein (GP) in a cholesterol-dependent manner.
• The inhibitor competes with cholesterol for binding to LAMP1, thereby blocking LASV entry.

Conclusions:

• Cholesterol plays a critical role in the entry mechanism of Lassa fever virus.
• LAMP1 is a crucial host factor mediating LASV infection.
• The identified inhibitor and its target present a promising avenue for therapeutic intervention against LASV.