Scientists discover a key molecular interaction in bacterial pathogens, opening the door for new treatment strategies

A science lab at UNLV.
Photo Credit: Josh Hawkins / University of Nevada, Las Vegas

The legendary Alexander Fleming, who famously discovered penicillin, once said “never to neglect an extraordinary appearance or happening.” And the path of science often leads to just that. New UNLV research is turning the page in our understanding of harmful bacteria and how they turn on certain genes, causing disease in our bodies.

A team of interdisciplinary scientists, led by professor and microbiologist Helen Wing, focuses on Shigella – a lethal bacterial pathogen that causes abdominal cramping, fever, and diarrhea. The Centers for Disease Control and Prevention estimates that Shigella cases lead to 600,000 deaths globally each year.

Shigella contains a major ‘switch’ protein (VirB), which triggers the bacterium to cause disease in humans. VirB does this by binding to Shigella’s DNA, activating the disease. The researchers showed that it is possible that interfering with VirB’s binding process can prevent Shigella from making us sick.

Professor Helen Wing.
Photo Credit: Courtesy of UNLV 

The study, which was published Sept. 20 in the top-ranked microbiology journal mBIO, earned the journal’s “Editor’s Pick” accolade.

“When molecular substitutions are made in VirB, this protein loses the ability to turn on virulence genes in Shigella, therefore making Shigella non-infectious,” said Taylor Gerson, a fourth-year Ph.D. student at UNLV and the study’s first author.

Traditionally, proteins that control how harmful a disease is, such as VirB, have been underappreciated. The goal of the team’s microbiology lab is to better understand these ‘switch’ proteins, which turn an otherwise harmless bacteria into an aggressive pathogen.

“I think our research has a broader impact,” said Monika Karney, a UNLV lab technician and study co-author. “What we’re seeing with this one protein in this one bacterium – there’s room for it to be applied to other proteins in other clinically relevant bacteria.”

The implications this research has for other pathogens remain to be seen, but the hope is that it is a major stepping stone toward putting a big red “X” through some of the diseases plaguing many parts of the world.

“We study these molecules to understand how they function in disease, so that other labs may look into finding drugs that kill these pathogens,” said Wing. “Understanding these proteins and what they interact with is critical.”

Integral to the research is CPT, or cytidine triphosphate, and its role in the binding process. The molecule is traditionally used as a building block for making DNA and RNA, and is needed by VirB for this process. Interfering with that binding process is what ultimately opens the door for future treatment strategies and potentially minimizes the impacts of harmful bacteria, such as Shigella.

Published in journal: mBIO

Additional information: In addition to Gerson, Wing, and Karney, the following researchers collaborated on the research: Audrey Ott, Jillian Socea, Daren Ginete, and Ronald Gary of UNLV; and Lakshminarayan Iyer and L. Aravind from the National Library of Medicine in Bethesda, MD.

Source/Credit: University of Nevada, Las Vegas

Reference Number: mcb101623_03

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