Journal of Applied Microbiology (1998) 84, 501-508

N. Wasano, K.-H. Kim and M. Ohba (1998)
Delta-endotoxin proteins associated with spherical parasporal inclusions of the four Lepidoptera-specific Bacillus thuringiensis strains
Journal of Applied Microbiology 84 (4), 501-508
Abstract: Four Lepidoptera-specific reference strains of Bacillus thuringiensis, belonging to serovars sumiyoshiensis (H3a:3d), fukuokaensis (H3a:3d:3e), darmstadiensis (H10a:10b) and japonensis (H23), which produce spherical parasporal inclusions, were examined for comparative characterization of delta- endotoxins. SDS-PAGE profiles of the alkali-solubilized parasporal inclusions revealed the presence of single major protein bands of 130 kDa in the four strains. Chymotrypsin and trypsin treatment of the proteins gave profiles different from those of the strains HD-1 (serovar kurstaki, H3a:3b:3c) and T84 A1 (serovar sotto, H4a:4b). Also, minor variations were observed in proteolysis profiles among the four strains. The LC₅₀ values of purified parasporal inclusions for the silkworm (Bombyx mori) larvae were 7·35, 6·45, 3·08 and 2·63 µg g^-1 diet, respectively, showing that their toxicity levels were 5-15 times lower than that of the strain HD-1 (0·49 µg g^-1 diet). Analysis by immunodiffusion and immunoblotting with polyclonal antisera revealed that parasporal inclusion proteins of the four strains are highly related, whereas they shared few or no common antigens with those of the strains HD-1, T84 A1 and Buibui (serovar japonensis).
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Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
molecular biology - genes

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
Bacillus thuringiensis var. darmstadiensis (entomopathogen)
Bacillus thuringiensis var. japonensis (entomopathogen)
Bacillus thuringiensis var. fukuokaensis (entomopathogen)
Bacillus thuringiensis var. sumiyoshiensis (entomopathogen)