Abstract
Vibrio cholerae, the causative agent of cholera, has an absolute requirement for iron and must obtain this element in the human host as well as in its varied environmental niches. It has multiple systems for iron acquisition, including the TonB-dependent transport of heme, the endogenous siderophore vibriobactin and several siderophores that are produced by other microorganisms. There is also a Feo system for the transport of ferrous iron and an ABC transporter, Fbp, which transports ferric iron. There appears to be at least one additional high affinity iron transport system that has not yet been identified. In iron replete conditions, iron acquisition genes are repressed by Fur. Fur also represses the synthesis of a small, regulatory RNA, RyhB, which negatively regulates genes for iron-containing proteins involved in the tricarboxylic acid cycle and respiration as well as genes for motility and chemotaxis. The redundancy in iron transport systems has made it more difficult to determine the role of individual systems in vivo and in vitro, but it may reflect the overall importance of iron in the growth and survival of V. cholerae.
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Acknowledgments
We wish to acknowledge Payne lab members past and present who have contributed to our understanding of iron acquisition in V. cholerae, including, Candye Andrus, Suzanne Barth, Stephanie Craig, Carolyn Fisher, Douglas Henderson, Vanamala Kanukurthy, Deborah Occhino Wrona, Stefan Seliger, Janice Stoebner, and Ana Maria Valle. This work was supported by National Institutes of Health Grant AI50669 and the Foundation for Research.
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Wyckoff, E.E., Mey, A.R. & Payne, S.M. Iron acquisition in Vibrio cholerae . Biometals 20, 405–416 (2007). https://doi.org/10.1007/s10534-006-9073-4
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DOI: https://doi.org/10.1007/s10534-006-9073-4