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      Influenza Antigen Engineering Focuses Immune Responses to a Subdominant but Broadly Protective Viral Epitope

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          Abstract

          Viral glycoproteins are under constant immune surveillance by the host adaptive immune responses. Antigenic variation including glycan introduction or removal is among the mechanisms viruses have evolved to escape host immunity. Understanding how glycosylation affects immunodominance on complex protein antigens may help decipher underlying B cell biology. To determine how B cell responses can be altered by such modifications, we engineered glycans onto the influenza virus hemagglutinin (HA) and characterized the molecular features of the elicited humoral immunity in mice. We found that glycan addition changed the initially diverse antibody repertoire into an epitope-focused, genetically restricted response. Structural analyses showed that one antibody gene family targeted a previously subdominant, occluded epitope at the head interface. Passive transfer of this antibody conferred Fc-dependent protection to influenza virus-challenged mice . These results have potential implications for next-generation viral vaccines aimed at directing B cell responses to preferred epitope(s). Eliciting protective immunity against influenza remains a major challenge. Bajic et al. show how hemagglutinin (HA) hyperglycosylation can restrict the resulting antibody repertoire to an occluded epitope at the HA head interface. These antibodies protect against influenza virus challenge, providing insights into antigen engineering to alter antibody responses.

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          Author and article information

          Journal
          Cell Host & Microbe
          Cell Host & Microbe
          Elsevier BV
          19313128
          May 2019
          May 2019
          Article
          10.1016/j.chom.2019.04.003
          6748655
          31104946
          16458b42-4d01-4d76-81a1-ebc2ab811012
          © 2019

          https://www.elsevier.com/tdm/userlicense/1.0/

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