Regular ArticleGeneration of Active Immunotoxins Containing Recombinant RESTRICTOCIN (cas 1406-72-0)☆

Add time:09/29/2019    Source:sciencedirect.com

Restrictocin, a toxin produced by the fungusAspergillus restrictus,is a potent inhibitor of eukaryotic protein synthesis. Recombinant restrictocin was made inEscherichia coliand purified to homogeneity in large amounts. The recombinant protein was found to be poorly immunogenic in mice with low toxicity, when injected intraperitoneally. Two immunotoxins were constructed by coupling the recombinant restrictocin to an antibody to the human transferrin receptor, using a cleavable and a stable linkage. The immunotoxins so generated showed specific cytotoxic activity toward receptor bearing cells in tissue culture. Immunotoxin with a cleavable linkage, however, was more active than that containing a stable linkage. Restrictocin appears to be a promising candidate to be developed as a chimeric toxin for targeted therapy.

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