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Related Concept Videos

Enzyme-Linked Immunosorbent Assay01:33

Enzyme-Linked Immunosorbent Assay

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In 1971, Peter Perlman and Eva Engvall developed an Enzyme-linked immunosorbent assay (ELISA or EIA). ELISA differs from western blot in that the assays are conducted in microtiter plates or in vivo rather than on an absorbent membrane.
There are many different types of ELISAs, but they all involve an antibody molecule whose constant region binds an enzyme, leaving the variable region free to bind its specific antigen.  Enzyme-substrate reaction allows the antigen to be visualized or...
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Homogeneous Glycoconjugate Produced by Combined Unnatural Amino Acid Incorporation and Click-Chemistry for Vaccine Purposes
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A Click-Type Enzymatic Method for Antigen-Adjuvant Conjugation.

Yange Sun1,2, Ting Li1, Yan Guo1

  • 1State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Biotechnology, Beijing, 100071, China.

Small Methods
|August 23, 2024
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A new enzymatic method covalently links protein antigens with CpG adjuvants, enhancing vaccine potency and reducing dosage. This approach simplifies manufacturing and enables the development of inhalable vaccines for infectious diseases and cancer.

Keywords:
CpG adjuvantHUH endonucleaseantigen‐adjuvant complexinhalable vaccine

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Area of Science:

  • Biochemistry
  • Immunology
  • Vaccine Development

Background:

  • Toll-like receptor 9 (TLR9) agonists like CpG oligodeoxynucleotides are potent vaccine adjuvants.
  • Current methods for combining protein antigens and adjuvants can be inefficient or require high dosages.
  • Novel strategies are needed to improve antigen-adjuvant conjugation for enhanced vaccine efficacy.

Purpose of the Study:

  • To develop a novel enzymatic method for site-specific covalent conjugation of protein antigens and CpG adjuvants.
  • To create stable antigen-adjuvant complexes using a recombinant fusion protein.
  • To evaluate the immunogenicity and efficacy of these complexes in preclinical models.

Main Methods:

  • Enzymatic coupling using a recombinant DCV endonuclease fused with SpyTag to link CpG adjuvants.
  • Post-purification conjugation of CpG-adjuvant conjugates with protein antigens (SARS-CoV-2 RBD) containing SpyCatcher sequences.
  • Subcutaneous and intratracheal administration of antigen-adjuvant complexes in mouse models.

Main Results:

  • Stable, covalently-linked antigen-adjuvant complexes were successfully generated.
  • The SARS-CoV-2 RBD-CpG complex elicited high-titer, specific antibody responses in mice.
  • A tumor vaccine candidate demonstrated significant inhibition of cancer progression after intratracheal administration.

Conclusions:

  • The enzymatic conjugation strategy provides precise, site-specific coupling, preserving antigen integrity.
  • This method simplifies manufacturing and facilitates the development of advanced vaccine formulations, including inhalable vaccines.
  • The approach holds promise for developing potent vaccines against infectious diseases and cancer.