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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Contribution of the 65-kilodalton protein encoded by the cloned gene cry19A to the mosquitocidal activity of Bacillus thuringiensis subsp. jegathesan.

Two new crystal protein genes, cry19A and orf2, isolated from Bacillus thuringiensis subsp. jegathesan were cloned and characterized. The cry19A gene encodes a 74.7-kDa protein, and the orf2 gene encodes a 60-kDa protein. Cry19A contains the five conserved blocks present in most B. thuringiensis delta-endotoxins. The ORF2 amino acid sequence is similar to that of the carboxy terminus of Cry4 proteins. The cry 19A gene was expressed independently or in combination with orf2 in a crystal-negative B. thuringiensis host. The proteins accumulated as inclusions. Purified inclusions containing either Cry19A alone or Cry19A and ORF2 together were toxic to Anopheles stephensi and Culex pipiens mosquito larvae. They were more toxic to C. pipiens than to A. stephensi. However, inclusions containing Cry19A and ORF2 together were more toxic than inclusions of Cry19A alone but less toxic than the wild-type inclusions of B. thuringiensis subsp. jegathesan.[1]


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