Nanotechnology Now

Our NanoNews Digest Sponsors



Heifer International

Wikipedia Affiliate Button


android tablet pc

Home > Press > Scientists decipher mechanism behind antimicrobial 'hole punchers'

Photo by L. Brian Stauffer

The rapid development of bacterial resistance to conventional antibiotics has become a major public health concern. Gerard Wong, an Illinois professor, and colleagues at the University of Massachusetts have made a discovery that could shorten the road to new and more potent antibiotics.
Photo by L. Brian Stauffer

The rapid development of bacterial resistance to conventional antibiotics has become a major public health concern. Gerard Wong, an Illinois professor, and colleagues at the University of Massachusetts have made a discovery that could shorten the road to new and more potent antibiotics.

Abstract:
In the battle against bacteria, researchers have scored a direct hit. They have made a discovery that could shorten the road to new and more potent antibiotics.

Scientists decipher mechanism behind antimicrobial 'hole punchers'

CHAMPAIGN, IL | Posted on September 20th, 2007

The rapid development of bacterial resistance to conventional antibiotics (such as penicillin or vancomycin) has become a major public health concern. Because resistant strains of bacteria can arise faster than drug companies can create antibiotics, understanding how these molecules function could help companies narrow their focus on potential antibiotics and bring them to market sooner.

As reported in a paper accepted for publication in the Journal of the American Chemical Society and posted on its Web site, researchers have now deciphered the molecular mechanism behind selective antimicrobial activity for a prototypical class of synthetic compounds.

The compounds, which mimic antimicrobial peptides found in biological immune systems, "function as molecular ‘hole punchers,' punching holes in the membranes of bacteria," said Gerard Wong, a professor of materials science and engineering, physics, and bioengineering at the U. of I., and a corresponding author of the paper. "It's a little like shooting them with a hail of nanometer-sized bullets - the perforated membranes leak and the bacteria consequently die."

The researchers also determined why some compounds punch holes only in bacteria, while others kill everything within reach, including human cells.

"We can use this as a kind of Rosetta stone to decipher the mechanisms of much more complicated antimicrobial molecules," said Wong, who also is a researcher at the university's Beckman Institute.

"If we can understand the design rules of how these molecules work, then we can assemble an arsenal of killer molecules with small variations, and no longer worry about antimicrobial resistance."

In a collaboration between the U. of I. and the University of Massachusetts at Amherst, the researchers first synthesized a prototypical class of antimicrobial compounds, then used synchrotron small-angle X-ray scattering to examine the structures made by the synthetic compounds and cell membranes.

Composed of variously shaped lipids, including some that resemble traffic cones, the cell membrane regulates the passage of materials in and out of the cell. In the presence of the researchers' antimicrobial molecules, the cone-shaped lipids gather together and curl into barrel-shaped openings that puncture the membrane. Cell death soon follows.

The effectiveness of an antimicrobial molecule depends on both the concentration of cone-shaped lipids in the cell membrane, and on the shape of the antimicrobial molecule, Wong said. For example, by slightly changing their synthetic molecule's length, the researchers created antimicrobial molecules that would either kill nothing, kill only bacteria, or kill everything within reach.

"By understanding how these molecules kill bacteria, and how we can prevent them from harming human cells, we can provide a more direct and rational route for the design of future antibiotics," Wong said.

This work was supported by the National Science Foundation, the National Institutes of Health and the Office of Naval Research.

####

About University of Illinois
At Illinois, research shapes the campus identity, stimulates classroom instruction and serves as a springboard for public engagement activities throughout the world. Opportunities abound for graduate students to develop independent projects and launch their own careers as researchers while working alongside faculty and assisting in their research. Illinois continues its long tradition of groundbreaking accomplishments with remarkable new discoveries and achievements that inspire and enrich the lives of people around the world.

For more information, please click here

Contacts:
James E. Kloeppel
Physical Sciences Editor
217-244-1073


Gerard Wong
217-265-5254

Copyright © University of Illinois

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Nanomedicine

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research reveals how our bodies keep unwelcome visitors out of cell nuclei November 24th, 2014

ASU, IBM move ultrafast, low-cost DNA sequencing technology a step closer to reality November 24th, 2014

An Inside Job: UC-Designed Nanoparticles Infiltrate, Kill Cancer Cells From Within November 24th, 2014

Announcements

Vegetable oil ingredient key to destroying gastric disease bacteria: In mice, therapeutic nanoparticles dampen H. pylori bacteria and inflammation that lead to ulcers and gastric cancer November 25th, 2014

Research yields material made of single-atom layers that snap together like Legos November 25th, 2014

Blu-ray disc can be used to improve solar cell performance: Data storage pattern transferred to solar cell increases light absorption November 25th, 2014

Cooling with the coldest matter in the world November 24th, 2014

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoTech-Transfer
University Technology Transfer & Patents
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More












ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project







© Copyright 1999-2014 7th Wave, Inc. All Rights Reserved PRIVACY POLICY :: CONTACT US :: STATS :: SITE MAP :: ADVERTISE