Wed, Mar 29, 2017 | updated 08:46 AM IST

New protein findings may lead to new class of antibiotics

Updated: Sep 03, 2016 18:54 IST
Washingbton D.C. [USA], Sept. 3 (ANI): A first of its kind detailed research of atomic-level images of a peroxiredoxin has revealed a peculiar characteristic of the protein and might form the foundation for a new approach to antibiotics.

Scientists have used X-ray crystallography, a powerful technique that can reveal structures down to their individual atoms, to study the fundamental nature and behavior of this peroxiredoxin.

Peroxiredoxin is needed by all cells to help eliminate hydrogen peroxide, a toxin, and in normal cells this process is healthy and valuable.

But peroxiredoxin inside bacteria also helps provide protection from our immune cells and increases the virulence of bacterial cells that cause infections.

The researchers were able to visualize peroxiredoxin chemistry in action. They found that when it's restrained and loses its mobility, it also loses its function. And if the normal function is lost, it can lead to cell death.

If a molecule can be found that selectively blocks the motions of peroxiredoxin only in bacterial cells, which the researchers believe may be possible, it could function as an entirely new way to kill those cells.

This would leave normal cells undamaged and set the stage for new types of antibiotics.

With the increasing problem of antibiotic resistance to many existing drugs, this approach could have significant value, researchers said.

It might also work in synergy with existing antibiotics to improve their efficacy, they said.

Lead author Arden Perkins said, "Peroxiredoxins are found in animals, plants, and bacteria, and are proteins that are crucial for cell survival."

"The main function of peroxiredoxins is to eliminate hydrogen peroxide in cells by converting it to water," Perkins said, adding, "This toxin is a by-product of normal cell metabolism, and hydrogen peroxide has to be removed so it doesn't damage the cell. If peroxiredoxin doesn't do its job, cells will die."

With the extraordinary images provided by X-ray crystallography, the research also discovered that there are special regions on bacterial peroxiredoxins, different from those found in humans that could be specifically targeted.

If compounds could aim at those targets and selectively shut down the protective function of peroxiredoxin just in acteria, it would weaken or kill those cells.

"There's a lot of potential for this to be foundational work, something we can build on to create a new class of antibiotics. The key concept is selectively restraining the motions of peroxiredoxins in some cells, inactivating its function and leading to the death of the cells you want to kill," said Perkins.

Their findings were announced today in the journal Structure. (ANI)

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