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Updated: Feb 12, 2026

Investigating the Alleviating Effects of Bacillus cereus Administration on Colitis through Gut Microbiota Modulation
Published on: July 27, 2022
A ferric dicitrate uptake system is required for the full virulence of Bacillus cereus
Duncan R Harvie1, David J Ellar
1Department of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge, CB2 1GA, UK.
Abstract:
Bacillus cereus is an opportunistic human pathogen of increasing prevalence. Analysis of the Bacillus cereus genome sequence identified a potential ferric dicitrate uptake system. The three-gene operon was confirmed to be negatively regulated by the ferric uptake repressor (Fur). The Fec operon was genetically silenced using the integration suicide vector pMUTIN4. The mutant strain displayed no growth defect under iron-limited conditions but was unable to grow on ferric citrate as a sole iron source. The virulence of the mutant strain was attenuated in a lepidopteran infection model, highlighting the importance of iron uptake systems to the virulence of B. cereus and the potential of these systems to act as targets for novel antimicrobial agents.
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