Enterohemorrhagic Escherichia coli senses low biotin status in the large intestine for colonization and infection.

Abstract

Enterohemorrhagic Escherichia coli (EHEC) is an important foodborne pathogen that infects humans by colonizing the large intestine. Here we identify a virulence-regulating pathway in which the biotin protein ligase BirA signals to the global regulator Fur, which in turn activates LEE (locus of enterocyte effacement) genes to promote EHEC adherence in the low-biotin large intestine. LEE genes are repressed in the high-biotin small intestine, thus preventing adherence and ensuring selective colonization of the large intestine. The presence of this pathway in all nine EHEC serotypes tested indicates that it is an important evolutionary strategy for EHEC. The pathway is incomplete in closely related small-intestinal enteropathogenic E. coli due to the lack of the Fur response to BirA. Mice fed with a biotin-rich diet show significantly reduced EHEC adherence, indicating that biotin might be useful to prevent EHEC infection in humans.

• Authors: Bin Yang, Lu Feng, Fang Wang, Lei Wang
• Journal: Nature communications (Nat Commun) Vol. 6 Pg. 6592 (Mar 20 2015) ISSN: 2041-1723 [Electronic] England
• PMID: 25791315 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Bacterial Proteins
• Escherichia coli Proteins
• LEE protein, E coli
• Phosphoproteins
• Repressor Proteins
• ferric uptake regulating proteins, bacterial
• Biotin
• Carbon-Nitrogen Ligases
• birA protein, E coli

Topics

• Animals
• Bacterial Adhesion
• Bacterial Proteins (genetics, metabolism)
• Biotin (metabolism)
• Blotting, Western
• Carbon-Nitrogen Ligases (genetics, metabolism)
• Electrophoretic Mobility Shift Assay
• Enterohemorrhagic Escherichia coli (genetics, metabolism, pathogenicity)
• Escherichia coli Infections
• Escherichia coli O157 (genetics, metabolism, pathogenicity)
• Escherichia coli Proteins (genetics, metabolism)
• HeLa Cells
• Humans
• Intestine, Large (chemistry, metabolism)
• Intestine, Small (chemistry, metabolism)
• Mice
• Phosphoproteins (genetics, metabolism)
• Real-Time Polymerase Chain Reaction
• Repressor Proteins (genetics, metabolism)