Abstract
To investigate the distribution of the hemolysin II determinant among strains of Bacillus cereus and Bacillus thuringiensis, thirteen strains of B. cereus and fourteen strains of B. thuringiensis strains were tested for hybridization of their chromosomal DNAs with a DNA probe containing the B. cereus hemolysin II gene. In addition, the production of hemolysin II, whose activity is not inhibited by cholesterol, was tested. The presence (absence) of the hybridization response in the microorganism's genome correlated with the presence (absence) of cholesterol-unaffected hemolysin production. Only four out of thirteen B. cereus strains were found to give a positive response in hybridization experiments, whereas thirteen out of fourteen B. thuringiensis strains responded positively. DNAs from ten B. thuringiensis strains contained a 3.5 kb EcoRV fragment, which hybridized with the B. cereus hemolysin II gene probe. The 3.5 kb EcoRV DNA fragment from one of these strains (B. thuringiensis VKM-B1555) was cloned and expressed in Escherichia coli cells. The hemolysin encoded by the cloned DNA fragment was not inhibited by cholesterol and possessed all other properties of B. cereus hemolysin II. The obtained data clearly show limited distribution of hemolysin II among B. cereus strains and demonstrate that hemolysin II is more characteristic of B. thuringiensis than B. cereus.
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Budarina, Z.I., Sinev, M.A., Mayorov, S.G. et al. Hemolysin II is more characteristic of Bacillus thuringiensis than Bacillus cereus . Arch. Microbiol. 161, 252–257 (1994). https://doi.org/10.1007/BF00248701
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DOI: https://doi.org/10.1007/BF00248701