In vitro selection of a neutralization-resistant hepatitis C virus escape mutant

Meital Gal-Tanamy, Zhen Yong Keck, Min Kyung Yi, Jane A. McKeating, Arvind H. Patel, Steven K H Foung, Stanley M. Lemon

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Effective immunization against hepatitis C virus (HCV) infections is likely to require the induction of both robust T and B cell immunity. Although neutralizing antibodies may play an important role in control of infection, there is little understanding of the structure of the HCV envelope glycoproteins and how they interact with such antibodies. An additional challenge for vaccine design is the genetic diversity of HCV and the rapid evolution of viral quasispecies that escape antibody-mediated neutralization. We used a cell culture-infectious, chimeric HCV with the structural proteins of genotype 1a virus to identify envelope residues contributing to the epitope recognized by a broadly neutralizing, murine monoclonal antibody, AP33. By repetitive rounds of neutralization followed by amplification, we selected a population of viral escape mutants that resist stringent neutralization with AP33 and no longer bind the antibody. Two amino acid substitutions, widely separated in the linear sequence of the E2 envelope protein (N415Y and E655G), were identified by sequencing of cloned cDNA and shown by reverse genetics analysis to contribute jointly to the AP33 resistance phenotype. The N415Y mutation substantially lowered virus fitness, most likely because of a defect in viral entry, but did not reduce binding of soluble CD81 to immobilized HCV-pseudotyped retrovirus particles. The in vitro selection of an HCV escape mutant recapitulates the ongoing evolution of antigenic variants that contributes to viral persistence in humans and reveals information concerning the conformational structure of the AP33 epitope, its role in viral replication, and constraints on its molecular evolution.

Original languageEnglish (US)
Pages (from-to)19450-19455
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume105
Issue number49
DOIs
StatePublished - Dec 9 2008

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Hepacivirus
Antibodies
Epitopes
Viruses
Viral Structural Proteins
Reverse Genetics
Hepatitis A
Molecular Evolution
Virus Diseases
Retroviridae
Amino Acid Substitution
Infection Control
Neutralizing Antibodies
In Vitro Techniques
Immunity
Immunization
Glycoproteins
B-Lymphocytes
Vaccines
Complementary DNA

Keywords

  • Antibody
  • Immunity
  • Vaccine
  • Viral envelope

ASJC Scopus subject areas

  • General

Cite this

In vitro selection of a neutralization-resistant hepatitis C virus escape mutant. / Gal-Tanamy, Meital; Keck, Zhen Yong; Yi, Min Kyung; McKeating, Jane A.; Patel, Arvind H.; Foung, Steven K H; Lemon, Stanley M.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 105, No. 49, 09.12.2008, p. 19450-19455.

Research output: Contribution to journalArticle

Gal-Tanamy, Meital ; Keck, Zhen Yong ; Yi, Min Kyung ; McKeating, Jane A. ; Patel, Arvind H. ; Foung, Steven K H ; Lemon, Stanley M. / In vitro selection of a neutralization-resistant hepatitis C virus escape mutant. In: Proceedings of the National Academy of Sciences of the United States of America. 2008 ; Vol. 105, No. 49. pp. 19450-19455.
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