Abstract
The vir locus of Bordetella pertussis apparently encodes a trans-acting positive regulator that is required for the coordinate expression of genes associated with virulence: pertussis toxin, filamentous hemagglutinin (FHA), hemolysin, and adenylate cyclase toxin. DNA clones of vir and of genes required for the synthesis of some of the factors under vir control were obtained with DNA probes from the chromosomal DNA surrounding sites of Tn5 insertion mutations that inactivated those genes. Two vir clones were found which also contained genes required for the proper expression of FHA in B. pertussis. The plasmids which contained both the fha and vir genes expressed immunologically reactive FHA in Escherichia coli, as detected by colony blots, whereas plasmids which contained only fha or vir were negative in this assay. The regulation of FHA production in E. coli, as in B. pertussis, was temperature dependent and inhibited by high concentrations of either magnesium ions or nicotinic acid, indicating that the sequences cloned in E. coli contained the information required to preserve the physiological responses seen in B. pertussis. Further characterization of the vir-fha clones by Tn5 mutagenesis in E. coli and by the return of cloned sequences to B. pertussis in trans and to the B. pertussis chromosome led to the localization of the vir locus, the structural gene for FHA, and genes that are possibly required for the synthesis and export of FHA.
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