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Redox, amino acid, and fatty acid metabolism intersect with bacterial virulence in the gut.

A new interesting article has been published in Proc Natl Acad Sci U S A. 2018 Oct 22. pii: 201813451. doi: 10.1073/pnas.1813451115. [Epub ahead of print] and titled:

Redox, amino acid, and fatty acid metabolism intersect with bacterial virulence in the gut.

Authors of this article are:

Pifer R, Russell RM, Kumar A, Curtis MM, Sperandio V.

A summary of the article is shown below:

The gut metabolic landscape is complex and is influenced by the microbiota, host physiology, and enteric pathogens. Pathogens have to exquisitely monitor the biogeography of the gastrointestinal tract to find a suitable niche for colonization. To dissect the important metabolic pathways that influence virulence of enterohemorrhagic Escherichia coli (EHEC), we conducted a high-throughput screen. We generated a dataset of regulatory pathways that control EHEC virulence expression under anaerobic conditions. This unraveled that the cysteine-responsive regulator, CutR, converges with the YhaO serine import pump and the fatty acid metabolism regulator FadR to optimally control virulence expression in EHEC. CutR activates expression of YhaO to increase activity of the YhaJ transcription factor that has been previously shown to directly activate the EHEC virulence genes. CutR enhances FadL, which is a pump for fatty acids that represses inhibition of virulence expression by FadR, unmasking a feedback mechanism responsive to metabolite fluctuations. Moreover, CutR and FadR also augment murine infection by Citrobacter rodentium, which is a murine pathogen extensively employed as a surrogate animal model for EHEC. This high-throughput approach proved to be a powerful tool to map the web of cellular circuits that allows an enteric pathogen to monitor the gut environment and adjust the levels of expression of its virulence repertoire toward successful infection of the host.

Check out the article’s website on Pubmed for more information:

This article is a good source of information and a good way to become familiar with topics such as:

EHEC;cutR;enterohemorrhagic E. coli;fadL


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