Search results for " Mode of action"
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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.…
DEVELOPMENT AND QUALIFICATION OF BIOANALYTICAL METHODS FOR DEAMIDATED IFNβ-1a AND INVESTIGATION ABOUT THE MECHANISM OF ACTION
2021
Interferon beta-1a (IFNβ-1a) is a recombinant IFNβ with the tradename Rebif involved in several biological activities. Recently, it has been reported that artificial deamidation of IFNb-1a increases its biological response. Given the therapeutical potential, an investigation on the deamidated variant has been carried out via different approaches to discover the mechanism underlying this biological effect. The antiviral and immunomodulatory activity of deamidated cytokine was assessed using two precise and accurate cell-based assays. As expected, deamidated IFNβ-1a showed an increase in the biological response and its canonical pathway and receptor binding affinity were thorough analysed. De…