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Bacillus thuringiensis Cry1Ac toxin shares structurally five conserved blocs with the other δ‐endotoxins. To study the role of some amino acids belonging to these regions, two mutations, Y229P and F603S, were introduced respectively in blocs 2 and 5. The stability and crystallization of the resulting mutant proteins Cry1Ac′1 and Cry1Ac′3 were affected. Both of them lost their toxicity to the Lepidopteran...
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