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Diphtheria Toxin Mutant CRM197 (CRM197)

Target: CRM197
Molecular classification: Toxin (mutant), Carrier Protein

Overview

CRM197 is a genetically detoxified, non-toxic mutant of diphtheria toxin. It is widely used as a carrier protein in conjugate vaccines to enhance the immunogenicity of polysaccharides and haptens, making them capable of inducing robust T-cell-dependent immune responses. It contains a single amino acid substitution at position 52 (Glycine to Glutamic Acid; G52E), which abolishes the ADP-ribosyltransferase enzymatic activity responsible for toxicity.

Mechanism of action

Acts as a carrier protein to enhance the immunogenicity of conjugated antigens by facilitating T-cell dependent immune responses. In cancer therapy research, binds to HB-EGF receptors.

Biological functions

Immunogenic carrierAntigen presentation enhancementHB-EGF receptor binding

Disease associations

Infectious Diseases (vaccine prevention)Cancer (investigational therapies)

Safety considerations

Potential for residual toxicity in certain cell types (e.g., yeast)Immunogenicity (potential for anti-CRM197 antibody development)

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