Characterisation of the urease gene cluster in Bordetella bronchiseptica

Gene
D J McMillanM J Walker

Abstract

Bordetella bronchiseptica is a common ureolytic mammalian respiratory pathogen. The urease operon of this organism is encoded within an 8.9 kb DNA fragment which contains the structural genes (ureA, ureB and ureC) and accessory genes (ureD and ureG) homologous to other urease genes. Uniquely, the ureE and ureF genes are fused to form a hybrid protein, UreEF, which may result in tighter coordination of the putative functions of the individual accessory genes, nickel donation to the urease active site, and prevention of nickel incorporation until correct formation of the active site, respectively. The operon contains an additional open reading frame, UreJ, found only also in the Alcaligenes eutrophus urease operon. UreJ is also 37% homologous with HupE from Rhizobium leguminosarum bv. viciae, and may potentially be involved in nickel transport. A transcriptional activator, designated Bordetella bronchiseptica urease regulator (BbuR), is located directly upstream and in the opposite orientation to the urease operon. BbuR shares homology with members of the LysR regulatory protein family. LysR proteins have been shown to regulate urease in Klebsiella aerogenes (NAC), and catalase in Escherichia coli (OxyR), which offers the intrace...Continue Reading

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Citations

Sep 15, 2005·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Thomas EitingerJ Andrew C Smith
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