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Related Experiment Video

Updated: Jan 10, 2026

Paramyxoviruses for Tumor-targeted Immunomodulation: Design and Evaluation Ex Vivo
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Stabilized Full-Length Measles Fusion Protein Elicits Potent Immunity and Protection In Vivo.

Dawid S Zyla1, Gillian Zipursky2,3, Roberta Della Marca2,3,4

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|November 24, 2025
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Summary
This summary is machine-generated.

Developing stabilized measles virus (MeV) fusion (F) protein antigens offers a promising strategy for next-generation vaccines. Thermostable full-length F protein elicits superior immune responses compared to ectodomain, providing potential for immunocompromised individuals.

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Area of Science:

  • Virology
  • Vaccinology
  • Structural Biology

Background:

  • Measles virus (MeV) causes significant morbidity and mortality, especially in under-vaccinated populations.
  • Current live-attenuated vaccines primarily target the hemagglutinin (H) glycoprotein, with a weaker response to the fusion (F) protein.
  • The F protein is crucial for MeV entry into host cells.

Purpose of the Study:

  • To engineer and characterize stabilized, prefusion MeV F protein antigens to enhance immunogenicity.
  • To compare the immunogenicity and protective efficacy of soluble ectodomain (FECTO) and full-length (FFL) F protein constructs.
  • To evaluate the potential of these antigens as next-generation, non-replicating measles vaccines.

Main Methods:

  • Engineered stabilized FECTO and FFL constructs with mutations for thermal stability.
  • Utilized cryo-electron microscopy to confirm prefusion conformation of engineered antigens.
  • Assessed immunogenicity and protective efficacy in a cotton rat model following immunization and viral challenge.

Main Results:

  • Engineered FECTO and FFL constructs maintained native prefusion conformation.
  • Immunization with both FECTO and FFL induced neutralizing antibodies and protection against MeV challenge.
  • The most stable full-length construct (FFL 3M) showed a more potent neutralizing antibody response than its ectodomain counterpart.
  • No vaccine-enhanced respiratory disease was observed.

Conclusions:

  • Thermostable, full-length MeV F protein is a superior immunogen compared to its soluble ectodomain.
  • These stabilized F protein antigens represent promising candidates for next-generation, non-replicating measles vaccines.
  • This approach offers a safe alternative for immunocompromised individuals and those unable to receive live-virus vaccines.