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Newfound hijacked proteins linked to salmonella virulence
Date:8/23/2011

Scientists have discovered that bacteria like E. coli and Salmonella have a sneaky way of making minor alterations to their genes to boost their chances for infection.

It's a fascinating discovery made at Ohio State University, which is featured in the Aug. 14 issue of Nature Chemical Biology. This discovery shows how bacteria make tweaks in their genes, and their proteins to gain strength.

The team includes research scientist Herve Roy, who joined the University of Central Florida faculty at the College of Medicine this month. He co-authored the paper after conducting research in OSU Professor Michael Ibba's lab.

"Mother Nature tinkers a lot," Roy said from his new lab in Orlando. "Our recent findings illustrate that new proteins in living organisms often evolve from older pre-existing ones, and that evolution updates biochemical mechanisms of living cells by tweaking them a little by applying molecular patches."

The precise role of one protein in bacteria, EF-P, remains a mystery, but this team found that it plays an essential role in the virulence of Salmonella enterica typhimurium, a common foodborne pathogen causing diarrhea, fever, and abdominal cramps, and occasionally lifetime chronic arthritis. Salmonella also accounts for about 400 deaths each year in the United States.

EF-P is known to play a role in protein biosynthesis, which is a keystone mechanism present in all organisms. This process is the chain assembly line that decodes the blue prints stored in the genomes of living organisms, to make all the proteins necessary to sustain life.

The team's research identified a modification born by EF-P that acts as a molecular patch on protein synthesis. The patch seems to increase the bacteria's prowess. Interestingly, the modification on EF-P is made by a hijacked protein, normally involved in the protein synthesis machinery itself.

In the Aug. 14 issue of Nature Chemical Biology, R
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Contact: Zenaida Gonzalez Kotala
Zenaida.Kotala@ucf.edu
407-823-6120
University of Central Florida
Source:Eurekalert  

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Newfound hijacked proteins linked to salmonella virulence
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