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Bordetella Parapertussis and Bordetella Bronchiseptica Contain Transcriptionally Silent Pertussis Toxin Genes

Overview
Journal J Bacteriol
Specialty Microbiology
Date 1987 Jun 1
PMID 3584073
Citations 86
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Abstract

Pertussis toxin, the major virulence factor of Bordetella pertussis, is not produced by the closely related species Bordetella parapertussis and Bordetella bronchiseptica. It is shown here that these two species possess but do not express the complete toxin operon. Nucleotide sequencing of an EcoRI fragment of 5 kilobases comprising the regions homologous to the pertussis toxin genes shows that in this region, B. parapertussis and B. bronchiseptica are 98.5% and 96% homologous, respectively, to B. pertussis. The changes (mostly base pair substitutions) in many cases are identical in B. parapertussis and B. bronchiseptica, suggesting that these two species derive from a common ancestor. Many of the mutations common to B. parapertussis and B. bronchiseptica involve the promoter region, which becomes very inefficient. The S1 subunits of both species, when expressed in Escherichia coli, have the same ADP-ribosylating activity as the S1 subunit from B. pertussis, indicating that the mutations in the S1 gene described here do not affect its function.

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