Abstract

CRM45, a non-toxic mutant protein of diphtheria toxin, is treated with glutaraldehyde and conjugated to ricin agglutinin. The hybrid protein thus obtained is purified by gel filtration and affinity chromatography. The toxicity of the purified hybrid toxin is about 8–10 times grater than that of ricin agglutinin when tested in mice and cultured L cells.

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