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Computationally designed stem-epitope mimetics elicit broadly reactive antibodies.

Sarah Wehrle1,2,3, Andreas Scheck1,2,3, Laura Reusch4,3

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Summary

Designing new immunogens to mimic influenza hemagglutinin stem epitopes can elicit broadly neutralizing antibodies. This approach focuses the immune response, offering a potential strategy for developing universal influenza vaccines.

Keywords:
broadly neutralizing antibodiescomputational protein designepitope-focused vaccineshemagglutinininfluenza virussurface mimicry

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Area of Science:

  • Immunology
  • Virology
  • Structural Biology

Background:

  • Broadly neutralizing antibodies (bnAbs) offer protection against diverse influenza viruses by targeting conserved hemagglutinin (HA) stem epitopes.
  • The low immunogenicity of the HA stem region presents a challenge for inducing these protective antibodies.

Purpose of the Study:

  • To develop a structure-based immunogen design strategy to focus immune responses against conserved influenza HA stem epitopes.
  • To create epitope mimetics that display the stem region's vulnerable antigenic sites.

Main Methods:

  • Utilized computational protein design to create epitope mimetics based on the structural definition of a stem epitope.
  • Displayed the structurally complex stem antigenic site on heterologous protein scaffolds.
  • Assessed the binding of the designed immunogens to known HA stem-specific bnAbs.

Main Results:

  • The designed epitope mimetics successfully mimicked the target antigenic site and bound strongly to HA stem-specific bnAbs.
  • The immunogens elicited stem-specific antibodies effective against divergent group 1 and 2 influenza subtypes.
  • Demonstrated a general framework for designing immunogens that elicit focused immune responses.

Conclusions:

  • Structure-based epitope mimicry is a viable strategy for developing immunogens targeting conserved viral epitopes.
  • This approach can overcome the low immunogenicity of vulnerable sites like the influenza HA stem.
  • The developed framework holds promise for creating effective vaccine candidates against influenza and other variable pathogens.