Computational Study of HCV p7 Channel: Insight into a New Strategy for HCV Inhibitor Design

Area of Science:

• Biophysics
• Virology
• Structural Biology

Background:

• Hepatitis C virus (HCV) p7 protein functions as a crucial cation-selective ion channel.
• Understanding the ion transport mechanism of HCV p7 is vital for developing antiviral strategies.

Purpose of the Study:

• To elucidate the cation-selective mechanism of the HCV p7 ion channel.
• To identify potential novel inhibitors targeting the HCV p7 channel.

Main Methods:

• Construction of a hexameric model of the HCV p7 protein in lipid bilayers.
• Analysis of key residues (His9, Val6) involved in ion selectivity and gating.
• Virtual screening of the ChEMBL database using rimantadine as a structural template.

Main Results:

• Identified His9 as a selectivity filter and Val6 as a hydrophobic gate in the HCV p7 channel.
• Determined the binding pocket for channel blockers (amantadine, rimantadine) within the H2 and H3 helices.
• Discovered six candidate compounds with potential as novel HCV p7 channel inhibitors.

Conclusions:

• The structural model provides insights into the cation selectivity of the HCV p7 channel.
• Designing inhibitors with larger molecular volumes than existing drugs is a promising strategy.
• Six novel compounds show potential for development as anti-HCV therapeutics.