sequence analysis of inducible prophage phis3501 integrated into the haemolysin ii gene of bacillus thuringiensis var israelensis atcc35646
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2012
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Abstract
Diarrheic food poisoning by bacteria of the Bacillus cereus group is mostly due to several toxins encoded in the genomes. One of them, cytotoxin K, was recently identified as responsible for severe necrotic syndromes. Cytotoxin K is similar to a class of proteins encoded by genes usually annotated as haemolysin II (hlyII) in the majority of genomes of the B. cereus group. The partially sequenced genome of Bacillus thuringiensis var israelensis ATCC35646 contains several potentially induced prophages, one of them integrated into the hlyII gene. We determined the complete sequence and established the genomic organization of this prophage-designated phIS3501. During induction of excision of this prophage with mitomycin C, intact hlyII gene is formed, thus providing to cells a genetic ability to synthesize the active toxin. Therefore, this prophage, upon its excision, can be implicated in the regulation of synthesis of the active toxin and thus in the virulence of bacterial host. A generality of selection for such systems in bacterial pathogens is indicated by the similarity of this genetic arrangement to that of Staphylococcus aureus β-haemolysin.
| Reference Key |
moumen2012geneticssequence
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| Authors | ;Bouziane Moumen;Christophe Nguen-The;Alexei Sorokin |
| Journal | the lancet respiratory medicine |
| Year | 2012 |
| DOI |
10.1155/2012/543286
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