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. 1991 Jan;173(2):417–425. doi: 10.1128/jb.173.2.417-425.1991

Identification and cloning of a fur regulatory gene in Yersinia pestis.

T M Staggs 1, R D Perry 1
PMCID: PMC207028  PMID: 1898928

Abstract

Yersinia pestis is one of many microorganisms responding to environmental iron concentrations by regulating the synthesis of proteins and an iron transport system(s). In a number of bacteria, expression of iron uptake systems and other virulence determinants is controlled by the Fur regulatory protein. DNA hybridization analysis revealed that both pigmented and nonpigmented cells of Y. pestis possess a DNA locus homologous to the Escherichia coli fur gene. Introduction of a Fur-regulated beta-galactosidase reporter gene into Y. pestis KIM resulted in iron-responsive beta-galactosidase activity, indicating that Y. pestis KIM expresses a functional Fur regulatory protein. A cloned 1.9-kb ClaI fragment of Y. pestis chromosomal DNA hybridized specifically to the fur gene of E. coli. The coding region of the E. coli fur gene hybridized to a 1.1-kb region at one end of the cloned Y. pestis fragment. The failure of this clone to complement an E. coli fur mutant suggests that the 1.9-kb clone does not contain a functional promoter. Subcloning of this fragment into an inducible expression vector restored Fur regulation in an E. coli fur mutant. In addition, a larger 4.8-kb Y. pestis clone containing the putative promoter region complemented the Fur- phenotype. These results suggest that Y. pestis possesses a functional Fur regulatory protein capable of interacting with the E. coli Fur system. In Y. pestis Fur may regulate the expression of iron transport systems and other virulence factors in response to iron limitation in the environment. Possible candidates for Fur regulation in Y. pestis include genes involved in ferric iron transport as well as hemin, heme/hemopexin, heme/albumin, ferritin, hemoglobin, and hemoglobin/haptoglobin utilization.

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Selected References

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