Crystalline protein synthesized by Bacillus t | vedclass

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Question

(D) $Bacillus$ $thuringiensis$ $(Bt)$ produces insecticidal crystalline proteins called $Cry$ proteins in an inactive protoxin form.These crystals rem

Vedclass · Accepted Answer

Alkaline $pH$ in insect mid-gut

Vedclass · Answer

(D) $Bacillus$ $thuringiensis$ $(Bt)$ produces insecticidal crystalline proteins called $Cry$ proteins in an inactive protoxin form.These crystals remain inactive in the bacterium because the $pH$ of the bacterial cytoplasm is neutral.When an insect ingests the $Bt$ crystals,the alkaline $pH$ of the insect's mid-gut solubilizes the crystals and activates the toxin.The activated toxin then binds to the surface of mid-gut epithelial cells,creating pores that cause cell swelling and lysis,eventually leading to the death of the insect.

Crystalline protein synthesized by $Bacillus$ $thuringiensis$ is activated by

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$A$: $Bt$ toxin are protein crystals containing insecticidal protein.
$R$: $B. \text{ thuringiensis}$ forms these protein crystals throughout continuously during their growth period.

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