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© Research
Publication : Applied and environmental microbiology

Cloning and expression of a novel toxin gene from Bacillus thuringiensis subsp. jegathesan encoding a highly mosquitocidal protein.

Member: Marie-Laure Rosso
Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Applied and environmental microbiology - 01 Dec 1995

Delécluse A, Rosso ML, Ragni A,

Link to Pubmed [PMID] – 8534090

Appl. Environ. Microbiol. 1995 Dec; 61(12): 4230-5

A gene, designated cry11B, encoding a 81,293-Da crystal protein of Bacillus thuringiensis subsp. jegathesan was cloned by using a gene-specific oligonucleotide probe. The sequence of the Cry11B protein, as deduced from the sequence of the cry11B gene, contains large regions of similarity with the Cry11A toxin (previously CryIVD) from B. thuringiensis subsp. israelensis. The Cry11B protein was immunologically related to both Cry11A and Cry4A proteins. The cry11B gene was expressed in a nontoxic strain of B. thuringiensis, in which Cry11B was produced in large amounts during sporulation and accumulated as inclusions. Purified Cry11B inclusions were highly toxic for mosquito larvae of the species Aedes aegypti, Culex pipiens, and Anopheles stephensi. The activity of Cry11B toxin was higher than that of Cry11A and similar to that of the native crystals from B. thuringiensis subsp. jegathesan, which contain at least seven polypeptides.