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An engineered CRM197 variant with enhanced stability and efficacy.

Enbo Hu1, Chen Cao1, Cheng Chen2

  • 1National Key Laboratory of Advanced Biotechnology, Academy of Military Medical Sciences, Beijing, 100071, China.

International Journal of Biological Macromolecules
|April 30, 2026
PubMed
Summary

Engineered Cross-Reacting Material 197 (CRM197) exhibits enhanced stability and immunogenicity, surpassing wild-type CRM197 as a vaccine carrier and for tumor growth inhibition.

Keywords:
CRM197 mutantCarrier proteinDiphtheria vaccineImmune memoryTh1/Th17 responseTumor therapy

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Area of Science:

  • Biochemistry
  • Immunology
  • Vaccine Development

Background:

  • Cross-Reacting Material 197 (CRM197) is a diphtheria toxin mutant used as a carrier protein in conjugate vaccines.
  • CRM197's structural instability limits its use, causing degradation and reduced immunogenicity.
  • CRM197 also has antitumor properties through interaction with heparin-binding epidermal growth factor (HB-EGF).

Purpose of the Study:

  • To engineer a CRM197 mutant with improved stability and immunogenicity.
  • To evaluate the engineered mutant's efficacy as a diphtheria immunogen and conjugate carrier.
  • To assess the mutant's HB-EGF-binding activity for potential antitumor applications.

Main Methods:

  • Site-directed mutagenesis was used to engineer the CRM197 mutant.
  • Immunogenicity was assessed in vivo, comparing the mutant to wild-type CRM197.
  • HB-EGF binding activity and structural stability were analyzed.

Main Results:

  • The engineered CRM197 mutant demonstrated superior stability and immunogenicity compared to wild-type CRM197.
  • The mutant elicited rapid, potent, and sustained immunity.
  • Effective HB-EGF-binding activity was maintained, indicating potential for tumor growth inhibition.

Conclusions:

  • The engineered CRM197 mutant offers enhanced stability and immunogenicity for vaccine applications.
  • Structural modifications, including a rigidified loop and additional hydrogen bonds, underlie the observed improvements.
  • The mutant shows promise as both a superior diphtheria immunogen/conjugate carrier and a therapeutic agent for tumor growth inhibition.