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Salmonella enterica  is a common cause of diarrhea. For eliciting disease, the pathogen has to colonize the gut lumen, a site colonized by the microbiota. This process/initial stage is incompletely understood. Recent work established that one particular strain,  Salmonella enterica  subspecies 1 serovar Typhimurium strain SL1344, employs the  hyb  H 2 -hydrogenase for consuming microbiota-derived H 2  to support gut luminal pathogen growth: Protons from the H 2 -splitting reaction contribute to the proton gradient across the outer bacterial membrane which can be harvested for ATP production or for import of carbon sources. However, it remained unclear, if other  Salmonella  strains would use the same strategy. In particular, earlier work had left unanswered if strain ATCC14028 might use H 2  for growth at systemic sites. To clarify the role of the hydrogenases, it seems important to establish if H 2  is used at systemic sites or in the gut and if  Salmonella  strains may differ with respect to the host sites where they require H 2  in vivo. In order to resolve this, we constructed a strain lacking all three H 2 -hydrogenases of ATCC14028 (14028 hyd3 ) and performed competitive infection experiments. Upon intragastric inoculation, 14028 hyd3  was present at 100-fold lower numbers than 14028 WT  in the stool and at systemic sites. In contrast, i.v. inoculation led to equivalent systemic loads of 14028 hyd3  and the wild type strain. However, the pathogen population spreading to the gut lumen featured again up to 100-fold attenuation of 14028 hyd3 . Therefore, ATCC14028 requires H 2 -hydrogenases for growth in the gut lumen and not at systemic sites. This extends previous work on ATCC14028 and supports the notion that H 2 -utilization might be a general feature of  S.  Typhimurium gut colonization.

Salmonella Typhimurium Strain ATCC14028 Requires H2-Hydrogenases for Growth in the Gut, but Not at Systemic Sites