ArticleCurrent microbiology2011
Germinant generation from δ-endotoxin of Bacillus thuringiensis strain 1.1.
Article in Current microbiology, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
The novel finding of this study is that the δ-endotoxin present in the spore coat of Bacillus thuringiensis strain 1.1 (Bt1.1), plays a central role in spore germination by generation of germinant via its β-glucosidase activity and is based on the following: (i) the crystals of Bt1.1 consist of the 140 kDa δ-endotoxin which exhibits β-glucosidase enzymatic activity. Besides crystals, δ-endotoxin is also located in the spore coat and at this site displays β-glucosidase activity, resulting in glucose production; (ii) glucose is an efficient germinant of both Bt1.1 and acrystalliferous Bt4.1 strain; (iii) substrates of β-glucosidase can activate the germination of Bt1.1 spores, but not those of the acrystalliferous Bt4.1 sister strain that do not contain the 140 kDa δ-endotoxin; (iv) Reduction or enhancement of enzymatic activity of δ-endotoxin, results in retardation or acceleration of germination and outgrowth, respectively. Bt1.1 cells secrete a 60 kDa polypeptide which displays β-glucosidase activity as indicated by zymogram analysis and which is immunologically related to the 140 kDa δ-endotoxin.
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