An Oxidative Central Metabolism Enables Salmonella to Utilize Microbiota-Derived Succinate

Publication date: Available online 24 August 2017
Source:Cell Host & Microbe
Author(s): Luisella Spiga, Maria G. Winter, Tatiane Furtado de Carvalho, Wenhan Zhu, Elizabeth R. Hughes, Caroline C. Gillis, Cassie L. Behrendt, Jiwoong Kim, Daniela Chessa, Helene L. Andrews-Polymenis, Daniel P. Beiting, Renato L. Santos, Lora V. Hooper, Sebastian E. Winter
The mucosal inflammatory response induced by Salmonella serovar Typhimurium creates a favorable niche for this gut pathogen. Conventional wisdom holds that S. Typhimurium undergoes an incomplete tricarboxylic acid (TCA) cycle in the anaerobic mammalian gut. One change during S. Typhimurium-induced inflammation is the production of oxidized compounds by infiltrating neutrophils. We show that inflammation-derived electron acceptors induce a complete, oxidative TCA cycle in S. Typhimurium, allowing the bacteria to compete with the microbiota for colonization. A complete TCA cycle facilitates utilization of the microbiota-derived fermentation product succinate as a carbon source. S. Typhimurium succinate utilization genes contribute to efficient colonization in conventionally raised mice, but provide no growth advantage in germ-free mice. Mono-association of gnotobiotic mice with Bacteroides, a major succinate producer, restores succinate utilization in S. Typhimurium. Thus, oxidative central metabolism enables S. Typhimurium to utilize a variety of carbon sources, including microbiota-derived succinate.

Graphical abstract

Teaser

Spiga et al. show that during colonization of the intestinal lumen, the enteric pathogen S. Typhimurium performs a complete TCA cycle. This oxidative central metabolism enables S. Typhimurium to utilize the microbiota-derived fermentation product succinate as a nutrient and to compete with the microbiota for colonization of the intestinal tract.


http://ift.tt/2gatehA