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ABSTRACT: The strain Bt-NGRA of Bacillus thuringiensis, isolated from a highly transformer oil contaminated soil, has the ability to produce high levels of extracellular caseinase, keratinase, elastase, lipase, phospholipase, esterase, and nuclease. Such a strain belongs to the serovar finitimus, and forms a bipyramidal crystal attached to the spore, constituted by a ca. 120 kDa protein, which has low insecticidal activity against Manduca sexta larvae (Lepidoptera), and none against Leptinotarsa texana (Coleoptera), Aedes aegypti and Culex quinquefasciatus (Diptera). Additionally, Bt-NGRA has only one plasmid (~43 MDa), produces no β-exotoxin and is able to grow in a medium with transformer oil as sole carbon source. When Bt-NGRA was cultured in presence of polychlorinated biphenyl mixture, some tetra, penta and hexachlorobiphenyls were partially degraded (33, 32 and 21%, respectively). This is the first report of a Bacillus thuringiensis strain isolated from a highly polychlorinated biphenyls contaminated soil.
