Summary of Study ST004270
This data is available at the NIH Common Fund's National Metabolomics Data Repository (NMDR) website, the Metabolomics Workbench, https://www.metabolomicsworkbench.org, where it has been assigned Project ID PR002696. The data can be accessed directly via it's Project DOI: 10.21228/M85K1P This work is supported by NIH grant, U2C- DK119886. See: https://www.metabolomicsworkbench.org/about/howtocite.php
| Study ID | ST004270 |
| Study Title | Amino Acid Decarboxylation Preserves Salmonella Fitness During Phagocyte-Derived Oxidative Stress |
| Study Summary | Successful establishment of infection by non-typhoidal Salmonella depends upon its ability to resist the antimicrobial defenses of the host innate immune response. To withstand the membrane depolarization that potentiates the killing activity of reactive oxygen species (ROS) produced by the phagocyte NADPH oxidase, Salmonella employs metabolic adaptations that maintain intracellular pH homeostasis and membrane energetics. Here, we identify amino acid decarboxylation as a critical determinant of Salmonella virulence and resistance to the oxidative pressures within the host environment. The proton-consuming decarboxylation of L-arginine preserves intracellular ∆pH and enhances Salmonella survival against the bactericidal effects of ROS, while downstream polyamine biosynthesis aids in bacterial recovery following ROS exposure. Polyamines alone cannot substitute for the immediate, protective impact of proton 26 consuming decarboxylation during oxidative stress killing. Specifically, we show that Salmonella relies on the combined activity of the inducible arginine AdiA and ornithine SpeF decarboxylases for resistance to oxidative stress, and that this activity is essential for Salmonella virulence during systemic infection. Together, amino acid decarboxylation and polyamine biosynthesis play complementary, but distinct roles in Salmonella adaptation to phagocyte-derived oxidative stress, providing a new framework for understanding how amino acid catabolism influences bacterial survival in the host |
| Institute | University of Colorado School of Medicine |
| Last Name | Stephenson |
| First Name | Daniel |
| Address | Research 1 South L18-1303 12801 E. 17th Ave., Aurora, Colorado, 80045, USA |
| daniel.stephenson@cuanschutz.edu | |
| Phone | 303-724-3339 |
| Submit Date | 2025-09-24 |
| Raw Data Available | Yes |
| Raw Data File Type(s) | mzXML, raw(Thermo) |
| Analysis Type Detail | LC-MS |
| Release Date | 2025-10-31 |
| Release Version | 1 |
Select appropriate tab below to view additional metadata details:
Combined analysis:
| Analysis ID | AN007107 | AN007108 |
|---|---|---|
| Chromatography ID | CH005399 | CH005400 |
| MS ID | MS006804 | MS006805 |
| Analysis type | MS | MS |
| Chromatography type | Reversed phase | Reversed phase |
| Chromatography system | Thermo Vanquish | Thermo Vanquish |
| Column | Waters ACQUITY UPLC BEH C18 (100 x 2.1mm,1.7um) | Waters ACQUITY UPLC BEH C18 (100 x 2.1mm,1.7um) |
| MS Type | ESI | ESI |
| MS instrument type | Orbitrap | Orbitrap |
| MS instrument name | Thermo Orbitrap Exploris 120 | Thermo Orbitrap Exploris 120 |
| Ion Mode | POSITIVE | NEGATIVE |
| Units | Peak area | Peak area |
