PJB-2009-224
A NOVEL DNA SEQUENCE OF BACILLUS THURINGIENSIS d-ENDOTOXIN RECEPTOR IN HELICOVERPA ARMIGERA
KAUSAR MALIK AND SHEIKH RIAZUDDIN
Abstract
The pesticidal bacterium Bacillus thuringiensis has been the subject of intensive research. Bacillus thuringiensis (Bt) crystal proteins are effective in controlling agriculturally and biomedically harmful insects. However, the mechanism of Bt protein pesticidal action is not well understood. It is assumed that the pesticidal protein has affinity for specific receptors in the midgut of the susceptible larvae and binds irreversibly to create holes in the gut leading to eventual death of the target larvae. The study is endeavored to characterization of Bt delta endotoxin receptor in agronomically important pest, American bollworm (Helicoverpa armigera). Presence of a novel Protein is reported in the extract of the larval midgut membrane of Helicoverpa armigera as putative receptor for Bt Cry1A delta-endotoxins. The gene sequence has novelty because it has no significant homology to already existing sequences of Bt receptor.
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