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. 1997 Jun;179(12):3997–4002. doi: 10.1128/jb.179.12.3997-4002.1997

A genetic locus involved in iron utilization unique to some Campylobacter strains.

P Guerry 1, J Perez-Casal 1, R Yao 1, A McVeigh 1, T J Trust 1
PMCID: PMC179210  PMID: 9190817

Abstract

Two genes involved in iron utilization in Campylobacter coli VC167 T1 have been characterized. The cfrA gene encodes a protein with a predicted Mr of 77,653 which, after processing of the leader sequence, has a predicted Mr of 75,635. This protein has significant sequence identity to siderophore receptors of several bacteria, and site-specific mutants defective in cfrA do not synthesize one of two major iron-repressible outer membrane proteins. An adjacent gene encodes a TonB-like protein; a mutant in this gene lost the ability to utilize hemin, ferrichrome, and enterochelin as iron sources. The cfrA and tonB genes of VC167 T1 hybridized to all strains of C. coli and most strains of C. jejuni examined but did not hybridize to several other strains of C. jejuni, suggesting that the thermophilic campylobacters can be separated into two categories based on the presence of these two iron utilization genes.

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Selected References

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