Nanotechnology Now





Heifer International

Wikipedia Affiliate Button


DHgate

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

Groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015

Iranian Scientists Find Simple, Economic Method to Synthesize Antibacterial Nanoparticles July 2nd, 2015

Leti Announces Launch of First European Nanomedicine Characterisation Laboratory: Project Combines Expertise of 9 Partners in 8 Countries to Foster Nanomedicine Innovation and Facilitate Regulatory Approval July 1st, 2015

Chitosan coated, chemotherapy packed nanoparticles may target cancer stem cells June 30th, 2015

Announcements

Clues to inner atomic life from subtle light-emission shifts: Hyperfine structure of light absorption by short-lived cadmium atom isotopes reveals characteristics of the nucleus that matter for high precision detection methods July 3rd, 2015

Pioneering Southampton scientist awarded prestigious physics medal July 3rd, 2015

Groundbreaking research to help control liquids at micro and nano scales July 3rd, 2015

NIST Group Maps Distribution of Carbon Nanotubes in Composite Materials July 2nd, 2015

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