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An Infectious Agent of Deception, Exposed Through Proteomics

Salmonella bacteria, infamous for food poisoning that kills hundreds of thousands worldwide, infect by stealth. They slip unnoticed into and multiply inside macrophages, the very immune system// cells the body relies on to seek and destroy invading microbes.

Just how Salmonella escapes detection by macrophages, turning predator cells to prey complicit in promoting infection, has seemed impossibly complicated, a needle-in-a-haystack proposition involving thousands of proteins, the building blocks that carry out cells’ vital functions.

Applying the high-volume sorting and analytical power of proteomics—a detailed survey of microbial proteins present in the 24 hours that follow mouse-macrophage infection—a team led by Liang Shi of the Department of Energy’s Pacific Northwest National Laboratory in Richland, Wash., has turned up a suspect protein.

The discovery of the protein, dubbed STM3117, is detailed today (Sept. 29) in The Journal of Biological Chemistry. Knocking out the gene that codes for STM3117, the researchers subsequently crippled the microbe’s ability to multiply inside macrophages. Shi and colleagues say the protein and two closely related proteins discovered in the study are similar in genetic sequence to those known to make and modify chemicals in the microbe’s cell wall called peptidoglycan.

Drug and vaccine designers armed with this mouse-model information can target chemicals or immune responses that disrupt peptidoglycan synthesis and other processes linked to Salmonella’s colonization of macrophages in humans, said Joshua Adkins, a co-author on Shi’s paper and lead author of a related study in Molecular & Cellular Proteomics last month. A quick identification of these proteins, Adkins added, could help physicians assess the virulence of a given strain.

The candidate proteins were winnowed from among 315 possibilities that emerged through a combination of techniques, culminating in measureme
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