Functional selection of hepatitis C virus envelope E2-binding Peptide ligands by using ribosome display

Area of Science:

• Virology
• Molecular Biology
• Drug Discovery

Background:

• Hepatitis C virus (HCV) entry inhibitors are potential antiviral drugs.
• Ribosome display is a powerful cell-free technique for selecting peptide ligands from large libraries.

Purpose of the Study:

• To identify high-affinity peptide ligands that bind to the HCV E2 envelope protein.
• To evaluate the therapeutic and diagnostic potential of selected peptides against HCV.

Main Methods:

• Utilized ribosome display for 13 rounds of selection to isolate HCV E2-binding peptides.
• Characterized the binding affinity and specificity of the selected peptide PE2D to HCV E2.
• Assessed the inhibitory effect of PE2D on HCV entry into hepatocytes and its ability to capture HCV particles.

Main Results:

• Selected a 12-mer peptide, PE2D, with high affinity and specificity for the HCV E2 protein.
• Identified amino acids 489-508 of E2 as critical for PE2D binding.
• PE2D significantly blocked E2 binding to hepatocytes and inhibited HCV cell culture (HCVcc) entry.
• PE2D successfully captured HCVcc and HCV particles from patient serum.

Conclusions:

• The novel peptide PE2D effectively inhibits HCV entry by targeting the E2 protein.
• PE2D demonstrates significant potential as a molecular probe, therapeutic agent, or diagnostic reagent for HCV.