Food safety assessment of Cry8Ka5 mutant protein using XXXX Ac as a control Bt protein.

@entity1522 @entity137 @entity37922 @entity2708 @entity19 @entity11137
UNASSIGNED: Cry8Ka5 is a mutant protein from @entity11137 (Bt) that has been proposed for developing transgenic plants due to promising activity against coleopterans, like Anthonomus grandis (the major pest of Brazilian @entity2708 culture). Thus, an early food safety assessment of Cry8Ka5 protein could provide valuable information to support its use as a harmless biotechnological tool. This study aimed to evaluate the food safety of Cry8Ka5 protein following the two-tiered approach, based on weights of evidence, proposed by ILSI. Cry1Ac protein was used as a control Bt protein. The history of safe use revealed no convincing hazard reports for Bt pesticides and three-domain Cry proteins. The bioinformatics analysis with the primary @entity1522 sequence of Cry8Ka5 showed no similarity to any known @entity137 , antinutritional or allergenic proteins. The mode of action of Cry proteins is well understood and their fine specificity is restricted to insects. Cry8Ka5 and Cry1Ac proteins were rapidly degraded in simulated gastric fluid, but were resistant to simulated intestinal fluid and heat treatment. The LD50 for Cry8Ka5 and @entity37922 Ac was >5000   mg/kg body weight when administered by gavage in @entity19 . Thus, no expected relevant risks are associated with the consumption of Cry8Ka5 protein.
