HIV Envelope Glycoform Heterogeneity and Localized Diversity Govern the Initiation and Maturation of a V2 Apex Broadly Neutralizing Antibody Lineage

Immunity. 2017 Nov 21;47(5):990-1003.e9. doi: 10.1016/j.immuni.2017.11.002.

Abstract

Understanding how broadly neutralizing antibodies (bnAbs) to HIV envelope (Env) develop during natural infection can help guide the rational design of an HIV vaccine. Here, we described a bnAb lineage targeting the Env V2 apex and the Ab-Env co-evolution that led to development of neutralization breadth. The lineage Abs bore an anionic heavy chain complementarity-determining region 3 (CDRH3) of 25 amino acids, among the shortest known for this class of Abs, and achieved breadth with only 10% nucleotide somatic hypermutation and no insertions or deletions. The data suggested a role for Env glycoform heterogeneity in the activation of the lineage germline B cell. Finally, we showed that localized diversity at key V2 epitope residues drove bnAb maturation toward breadth, mirroring the Env evolution pattern described for another donor who developed V2-apex targeting bnAbs. Overall, these findings suggest potential strategies for vaccine approaches based on germline-targeting and serial immunogen design.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • AIDS Vaccines / immunology
  • Antibodies, Neutralizing / chemistry
  • Antibodies, Neutralizing / physiology*
  • Cell Lineage*
  • Complementarity Determining Regions
  • HIV Antibodies / chemistry
  • HIV Antibodies / physiology*
  • Humans
  • env Gene Products, Human Immunodeficiency Virus / immunology*

Substances

  • AIDS Vaccines
  • Antibodies, Neutralizing
  • Complementarity Determining Regions
  • HIV Antibodies
  • env Gene Products, Human Immunodeficiency Virus