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Bacillus thuringiensis Cry toxins are used in the control of insect pests. They are pore-forming toxins with a complex mechanism that involves the sequential interaction with receptors. They are produced as protoxins, which are activated by midgut proteases. Activated toxin binds to cadherin receptor, inducing an extra cleavage including helix α-1, facilitating the formation of a pre-pore oligomer...
Based on the observation of large conductance states formed by Bacillus thuringiensis Cry toxins in synthetic planar lipid bilayers and the estimation of a pore size of 10–20 Å, it has been proposed that the pore could be formed by an oligomer containing four to six Cry toxin monomers. However, there is a lack of information regarding the insertion of Cry toxins into the membrane and oligomer formation...
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