Applied and Environmental Microbiology (1997) 63, 2716-2721

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Alejandra Guerchicoff, R.A. Ugalde and C.P. Rubinstein (1997)
Identification and characterization of a previously undescribed cyt gene in Bacillus thuringiensis subsp. israelensis
Applied and Environmental Microbiology 63 (7), 2716-2721
Abstract: Mosquitocidal Bacillus thuringiensis strains show as a common feature the presence of toxic proteins with cytolytic and hemolytic activities, Cyt1Aa1 being the characteristic cytolytic toxin of Bacillus thuringiensis subsp. israelensis. We have detected the presence of another cyt gene in this subspecies, highly homologous to cyt2An1, coding for the 29-kDa cytolytic toxin from B. thuringiensis subsp. kyushuensis. This gene, designated cyt2Ba1, maps upstream of cry4B coding for the 130-kDa crystal toxin, on the 72-MDa plasmid of strain 4Q2-72. Sequence analysis revealed, as a remarkable feature, a 5' mRNA stabilizing region similar to those described for some cry genes. PCR amplification and Southern analysis confirmed the presence of this gene in other mosquitocidal subspecies. Interestingly, anticoleopteran B. thuringiensis subsp. tenebrionis belonging to the morrisoni serovar also showed this gene. On the other hand, negative results were obtained with the anti-lepidopteran strains B. thuringiensis subsp. kurstaki HD-1 and subsp. aizawai HD-137. Western analysis failed to reveal Cyt2A-related polypeptides in B. thuringiensis subsp. israelensis 4Q2-72. However, B. thuringiensis subsp. israelensis 1884 and B. thuringiensis subsp. tenebrionis did show cross-reactive products, although in very small amounts.
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Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
molecular biology - genes
general biology - morphology - evolution

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Bacillus thuringiensis var. israelensis (entomopathogen)
Bacillus thuringiensis var. tenebrionis (entomopathogen)
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