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Updated: Sep 22, 2025

Protocol for Recombinant RBD-based SARS Vaccines: Protein Preparation, Animal Vaccination and Neutralization Detection
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Adaptation-proof SARS-CoV-2 vaccine design.

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    Researchers developed novel immunogens by grafting conserved SARS-CoV-2 spike protein regions onto scaffolds. This epitope grafting strategy aims to create broadly protective vaccines against mutating coronaviruses.

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    Area of Science:

    • Virology
    • Immunology
    • Vaccine Design

    Background:

    • The SARS-CoV-2 spike protein's receptor binding domain (RBD) is a key target for neutralizing antibodies, but mutations here allow viral escape.
    • Conserved structural regions of the spike protein offer potential targets for broader, more durable protection against SARS-CoV-2 variants.

    Approach:

    • Developed stable immunogens using 'epitope grafting' to present conserved spike protein epitopes on heterologous scaffolds.
    • Structurally characterized the epitope-scaffold designs, confirming agreement with computational models and target epitopes.
    • Immunized mice with engineered epitope-scaffolds and assessed antibody binding activity against spike protein.

    Key Points:

    • Epitope grafting successfully presented conserved SARS-CoV-2 spike protein features on diverse scaffolds.
    • Immunization with designed epitope-scaffolds elicited specific antibody responses.
    • Demonstrated the potential diagnostic utility of the engineered epitope-scaffolds.

    Conclusions:

    • This study presents a novel methodology for targeting conserved, non-RBD spike protein motifs for SARS-CoV-2 vaccine development.
    • Epitope grafting is a promising rational design approach for creating vaccines with broad protective capabilities.
    • The developed epitope-scaffolds show potential for both vaccine and diagnostic applications.