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Characterization of the spv Locus in Salmonella enterica Serovar Arizona

By Stephen J. Libby, Marc Lesnick, Patricia Hasegawa, Michael Kurth, Christopher Belcher, Joshua Fierer and Donald G. Guiney


Salmonella enterica serovar Arizona (S. enterica subspecies IIIa) is a common Salmonella isolate from reptiles and can cause serious systemic disease in humans. The spv virulence locus, found on large plasmids in Salmonella subspecies I serovars associated with severe infections, was confirmed to be located on the chromosome of serovar Arizona. Sequence analysis revealed that the serovar Arizona spv locus contains homologues of spvRABC but lacks the spvD gene and contains a frameshift in spvA, resulting in a different C terminus. The SpvR protein functions as a transcriptional activator for the spvA promoter, and SpvB and SpvC are highly conserved. The analysis supports the proposal that the chromosomal spv sequence more closely corresponds to the ancestral locus acquired during evolution of S. enterica, with plasmid acquisition of spv genes in the subspecies I strains involving addition of spvD and polymorphisms in spvA

Topics: Molecular Pathogenesis
Publisher: American Society for Microbiology
Year: 2002
DOI identifier: 10.1128/IAI.70.6.3290-3294.2002
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Provided by: PubMed Central
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