Abstract
Bacillus thuringiensis produces a variety of toxins, with the major group being the crystal proteins. The crystal protein ( cry) genes encoding for these proteins have recently been classified. The system is based on both the host range of the proteins and also on structure as it relates to DNA sequence. The mode of action of these toxins, in the light of current knowledge of structure and function, is also described. Another important toxin of B. thuringiensis is the heat-stable exotoxin, thuringiensin. This toxin, the expression of wwhich is plasmid-controlled, exerts its effect on the host by inhibition of RNA synthesis.
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