Two types of entomocidal crystals of Bacillus thuringiensis ssp finitimus have the same set of unique delta-endotoxins

The strain B-1166 differs from the other strains of Bacillus thuringiensis sap. finitimus because it has two crystal types with different localization in the sporulating cell, i.e., inside and outside of exosporium membrane. Two dissociants of the strain were obtained containing only one of the crys tal types. The initial strain produces at least three various delta-endotox ins (Fin2, Fin3, and Fin5) differing from all other known entomocidal prote ins; Fin2 and Fin3 are similar to each other but differ from FinS. Both cry stal types contain the same endotoxins (Fin2, Fin3, and FinS). In the B-116 6 strain the site of crystal deposition is not determined by their protein composition.