How Iron and Methylation Control a Bacterial Gene Switch
Author Information
Author(s): Brunet Yannick R., Bernard Christophe S., Gavioli Marthe, Lloubès Roland, Cascales Eric
Primary Institution: Laboratoire d'Ingénierie des Systèmes Macromoléculaires, CNRS – UPR 9027, Institut de Microbiologie de la Méditerranée, Aix-Marseille Université, Marseille, France
Hypothesis
What is the regulatory mechanism controlling expression of the enteroaggregative Escherichia coli sci1 T6SS gene cluster?
Conclusion
The expression of the sci1 Type VI secretion gene cluster is regulated by an epigenetic switch influenced by iron availability and DNA methylation.
Supporting Evidence
- The study identified Fur as the main regulator of the sci1 T6SS gene cluster.
- Fur binding prevents methylation at a specific GATC site, influencing gene expression.
- In iron-limited conditions, Fur is relieved from the promoter, allowing gene expression.
Takeaway
Bacteria can turn certain genes on or off based on the amount of iron available and some chemical changes to their DNA, which helps them adapt to their environment.
Methodology
The study used reporter fusion, gel shift, and in vivo and in vitro methylation assays to analyze the regulatory role of Fur and Dam-dependent methylation.
Digital Object Identifier (DOI)
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