Search results for "Toxin receptor binding"

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Mutations in the Bacillus thuringiensis Cry1Ca toxin demonstrate the role of domains II and III in specificity towards Spodoptera exigua larvae

2004

Several mutants of the Bacillus thuringiensis Cry1Ca toxin affected with regard to specific activity towards Spodoptera exigua were studied. Alanine was used to replace single residues in loops 2 and 3 of domain II (mutant pPB19) and to replace residues 541– 544 in domain III (mutant pPB20). Additionally, a Cry1Ca mutant combining all mutations was constructed (mutant pPB21). Toxicity assays showed a marked decrease in toxicity against S. exigua for all mutants, while they retained their activity against Manduca sexta, confirming the importance of these residues in determining insect specificity. Parameters for binding to the specific receptors in BBMV (brush border membrane vesicles) of S.…

Models MolecularMutantLaboratory of Virologyaminopeptidase nmedicine.disease_causeBiochemistrybrush-border membraneToxin oligomerizationSubstrate SpecificityBacterial toxin; Manduca sexta; Mode of action; Protoxin activation; Toxin oligomerization; Toxin receptor bindingHemolysin Proteinsmanduca-sextaBacillus thuringiensisheliothis-virescensAlanine:CIENCIAS DE LA VIDA::Bioquímica [UNESCO]MicrovillibiologyPRI BioscienceBiochemistryMode of actionLarvaThermodynamicsResearch ArticleProtein BindingBacterial Toxinspink-bollwormBacillus thuringiensisSpodopteraSpodopteraBinding CompetitiveManduca sextaLaboratorium voor VirologieBacterial ProteinsExiguamedicineirreversible bindingAnimalscrystal proteinsProtoxin activationProtein Structure QuaternaryMode of actionMolecular BiologyBacillus thuringiensis ToxinsToxin receptor bindingToxininsecticidal toxinpore formationCytoplasmic VesiclesfungiUNESCO::CIENCIAS DE LA VIDA::BioquímicaBacterial toxinCell Biologybiology.organism_classificationProtein Structure TertiaryEndotoxinsManduca sextaMutationcryia delta-endotoxins
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