Global and local envelope protein dynamics of hepatitis C virus determine broad antibody sensitivity

Sci Adv. 2020 Aug 26;6(35):eabb5938. doi: 10.1126/sciadv.abb5938. eCollection 2020 Aug.


Broad antibody sensitivity differences of hepatitis C virus (HCV) isolates and their ability to persist in the presence of neutralizing antibodies (NAbs) remain poorly understood. Here, we show that polymorphisms within glycoprotein E2, including hypervariable region 1 (HVR1) and antigenic site 412 (AS412), broadly affect NAb sensitivity by shifting global envelope protein conformation dynamics between theoretical "closed," neutralization-resistant and "open," neutralization-sensitive states. The conformational space of AS412 was skewed toward β-hairpin-like conformations in closed states, which also depended on HVR1, assigning function to these enigmatic E2 regions. Scavenger receptor class B, type I entry dependency of HCV was associated with NAb resistance and correlated perfectly with decreased virus propensity to interact with HCV co-receptor CD81, indicating that decreased NAb sensitivity resulted in a more complex entry pathway. This link between global E1/E2 states and functionally distinct AS412 conformations has important implications for targeting AS412 in rational HCV vaccine designs.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibodies, Neutralizing
  • Hepacivirus* / genetics
  • Hepatitis C Antibodies
  • Hepatitis C*
  • Humans
  • Viral Envelope Proteins / metabolism


  • Antibodies, Neutralizing
  • Hepatitis C Antibodies
  • Viral Envelope Proteins