Details

Autor(en) / Beteiligte

• Kong, Leopold
• Giang, Erick
• Robbins, Justin B
• Stanfield, Robyn L
• Burton, Dennis R
• Wilson, Ian A
• Law, Mansun

Titel

Structural basis of hepatitis C virus neutralization by broadly neutralizing antibody HCV1

Ist Teil von

• Proceedings of the National Academy of Sciences - PNAS, 2012-06, Vol.109 (24), p.9499-9504

Ort / Verlag

United States: National Academy of Sciences

Erscheinungsjahr

2012

Quelle

MEDLINE

Beschreibungen/Notizen

• Hepatitis C virus (HCV) infects more than 2% of the global population and is a leading cause of liver cirrhosis, hepatocellular carcinoma, and end-stage liver diseases. Circulating HCV is genetically diverse, and therefore a broadly effective vaccine must target conserved T- and B-cell epitopes of the virus. Human mAb HCV1 has broad neutralizing activity against HCV isolates from at least four major genotypes and protects in the chimpanzee model from primary HCV challenge. The antibody targets a conserved antigenic site (residues 412–423) on the virus E2 envelope glycoprotein. Two crystal structures of HCV1 Fab in complex with an epitope peptide at 1.8-Å resolution reveal that the epitope is a β-hairpin displaying a hydrophilic face and a hydrophobic face on opposing sides of the hairpin. The antibody predominantly interacts with E2 residues Leu ⁴¹³ and Trp ⁴²⁰ on the hydrophobic face of the epitope, thus providing an explanation for how HCV isolates bearing mutations at Asn ⁴¹⁵ on the same binding face escape neutralization by this antibody. The results provide structural information for a neutralizing epitope on the HCV E2 glycoprotein and should help guide rational design of HCV immunogens to elicit similar broadly neutralizing antibodies through vaccination.