title: The mosquito larvicidal activity of 130 kDa delta-endotoxin of Bacillus thuringiensis var. israelensis resides in the 72 kDa amino-terminal fragment.
abstract: Bacillus thuringiensis var. israelensis produces 130 kDa delta-endotoxin which is highly toxic to mosquito-larvae. The mosquito-larvicidal activity was delineated by sequential deletions from ends of the 1136 amino acids delta-endotoxin. A maximum of 459 amino acids could be removed from the carboxy-terminal of the toxin without a significant loss of the larvicidal activity. However, no more than 38 amino acids could be deleted from the amino-terminal without losing the toxicity. The truncated peptide of 72 kDa exhibited similar toxicity to the 130 kDa toxin and was between 39th and 677th amino acids.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001413:Bacillus thuringiensis / Q000032:analysis*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D001483:Base Sequence; D002872:Chromosome Deletion; D009033:Culicidae / Q000187:drug effects*; D004731:Endotoxins / Q000235:genetics / Q000494:pharmacology*; D006460:Hemolysin Proteins; D007814:Larva / Q000187:drug effects; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010446:Peptide Fragments / Q000032:analysis*
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004731:Endotoxins; D006460:Hemolysin Proteins; D010446:Peptide Fragments; C030956:insecticidal crystal protein, Bacillus Thuringiensis