Promotes colloidosmotic lysis by binding to the midgut epithelial cells of mosquitos (Probable). Has larvicidal activity against Culex pipiens molestus, but not to Anopheles stephensi. The crystal protein is produced during sporulation and is accumulated both as an inclusion and as part of the spore coat. Toxic segment of the protein is located in the N-terminus. Encoded on an unnamed 110 kb plasmid. Belongs to the delta endotoxin family.