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Biological sciences

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Structural stability of Bacillus thuringiensis delta-endotoxin homolog-scanning mutants determined by susceptibility to proteases

Article Abstract:

A study of 40 homolog-scanning mutant proteins of two Bacillus thuringiensis delta-endotoxin genes revealed three mutant groups. Group1 with 13 mutants did not contain delta-endotoxin under overexpressed conditions in Escherichia coli. Group 2 comprised 13 mutants that produced delta-endotoxins that were fully digested by 2% bovine trypsin. Group 3 mutants revealed the presence of delta-endotoxin and trypsin-stable toxins similar to wild-type toxins.

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Role of tryptophan residues in toxicity of Cry1Ab toxin from Bacillus thuringiensis

Article Abstract:

A study was conducted to examine the role of Trp residues in the structure and function of Cry1Ab toxin, produced by Bacillus thuringiensis. The results show that W65 and W316 are important for insecticidal activity of the toxin since their replacement by Phe reduced toxicity against Manduca sexta.

Physiological aspects, Tryptophan

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Enhancement of cry19Aa mosquitocidal activity against aedes aegypti by mutations in the putative loop regions of domain II

Article Abstract:

It is shown in the study that cry19Aa in bacillus thuringiensis is enhanced in toxicity for aedes aegypti. This is the first time toxicity in a cry toxin is increased by protein engineering.

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