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A cloned CryIVB toxin was purified from a cured strain of Bacillus thuringiensis (BT) containing the cryIVB gene on the recombinant plasmid Cam135. Solubilized protoxin was treated with Aedes gut extract or trypsin for varying times and tested for toxicity in vitro on three dipteran and one lepidopteran cell line. Treatment with the Aedes extract but not trypsin, produced an active toxin which lysed only Aedes aegypti cells out of those tested. This activation was time-dependent reaching a maximum after 6 h. Both the Aedes extract-treated and trypsin-treated toxin killed A. aegypti larvae, but this toxicity declined rapidly with increasing time of exposure to the proteolytic preparations.

Cytotoxicity of a cloned Bacillus thuringiensis subsp. israelensis CryIVB toxin to an Aedes aegypti cell line