- The Helicobacter pylori Ferric Uptake Regulator (Fur) Is Essential for Growth Under Sodium Chloride Stress
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Hanan Gancz , D. Scott Merrell
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J. Microbiol. 2011;49(2):294-298. Published online May 3, 2011
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DOI: https://doi.org/10.1007/s12275-011-0396-7
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Epidemiological data and animal models indicate that Helicobacter pylori and dietary NaCl have a synergistic ill effect on gastric maladies. Here we show that the Ferric Uptake Regulator (Fur), which is a crucial regulatory factor required for H. pylori colonization, is essential for growth in the presence of high NaCl concentrations. Moreover, we demonstrate that the transcriptional response induced by sodium chloride stress exhibits similarities to that seen under iron depletion.
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Citations
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- Helicobacter pylori apo-Fur Regulation Appears Unconserved Across Species
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Shana Miles , Beth M. Carpenter , Hanan Gancz , D. Scott Merrell
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J. Microbiol. 2010;48(3):378-386. Published online June 23, 2010
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DOI: https://doi.org/10.1007/s12275-010-0022-0
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667
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Abstract
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The Ferric Uptake Regulator (Fur) is a transcriptional regulator that is conserved across a broad number of bacterial species and has been shown to regulate expression of iron uptake and storage genes. Additionally, Fur has been shown to be an important colonization factor of the gastric pathogen Helicobacter pylori. In H. pylori, Fur-dependent regulation appears to be unique in that Fur is able to act as a transcriptional repressor when bound to iron as well as in its iron free (apo) form. To date, apo-regulation has not been identified in any other bacterium. To determine whether Fur from other species has the capacity for aporegulation, we investigated the ability of Fur from Escherichia coli, Campylobacter jejuni, Desulfovibrio vulgaris Hildenborough, Pseudomonas aeruginosa, and Vibrio cholerae to complement both iron-bound and apo-Fur regulation within the context of a H. pylori fur mutant. We found that while some Fur species (E. coli, C. jejuni, and V. cholerae) complemented iron-bound regulation, apo-regulation was unable to be complemented by any of the examined species. These data suggest that despite the conservation among bacterial Fur proteins, H. pylori Fur contains unique structure/function features that make it novel in comparison to Fur from other species.
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