Journal
APPLIED AND ENVIRONMENTAL MICROBIOLOGY
Volume 76, Issue 20, Pages 6955-6961Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/AEM.01393-10
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Funding
- Royal Society, New Zealand
- University of Otago
- National Science Foundation Division of Ocean Sciences [OCE-0453737, OCE-0825790]
- NW Regional Center of Excellence [5-U54-AIO57141-05]
- Directorate For Geosciences
- Division Of Ocean Sciences [0825790] Funding Source: National Science Foundation
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The biochemical and molecular mechanisms used by alkaliphilic bacteria to acquire iron are unknown. We demonstrate that alkaliphilic (pH > 9) Bacillus species are sensitive to artificial iron (Fe3+) chelators and produce iron-chelating molecules. These alkaliphilic siderophores contain catechol and hydroxamate moieties, and their synthesis is stimulated by manganese(II) salts and suppressed by FeCl3 addition. Purification and mass spectrometric characterization of the siderophore produced by Caldalkalibacillus thermarum failed to identify any matches to previously observed fragmentation spectra of known siderophores, suggesting a novel structure.
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