Scientists Find New Way to Kill Antibiotic-resistant Bacteria

by Jayashree on  July 11, 2007 at 11:48 AM Research News   - G J E 4
Scientists Find New Way to Kill Antibiotic-resistant Bacteria
Researchers at the University of North Carolina at Chapel Hill have found a way to put bacteria on birth control, the technique that may help stop the spread of drug-resistant microbes.

According to the researchers, the key to their discovery is a weakness in an enzyme that enables "fertile" bacteria to swap genes for drug resistance. They say that drugs called bisphosphonates, widely prescribed for bone loss, block this enzyme and prevent bacteria from spreading antibiotic resistance genes.

The researchers say that interfering with the enzyme has the added effect of annihilating antibiotic-resistant bacteria in laboratory cultures. Animal studies of the drugs are now underway.

"Our discoveries may lead to the ability to selectively kill antibiotic-resistant bacteria in patients, and to halt the spread of resistance in clinical settings," said senior study author Dr. Matt Redinbo, Professor of Chemistry, Biochemistry and Biophysics at UNC-Chapel Hill.

Almost every type of bacteria has become more resistant to antibiotic treatment in the last decade, and these bugs cause deadly infections that are difficult to treat and expensive to cure, according to the background information in an article published online in the Proceedings of the National Academy of Science.

When a person takes an antibiotic, any bug having a protective mutation against the drug survives. These drug-resistant microbes quickly accumulate useful mutations, and share them with other bacteria through conjugation.

The researchers analysed the enzyme relaxase that plays a crucial role in conjugation. It starts and stops the movement of DNA between bacteria.

It was found that bisphosphonates could block the spot where the enzyme handled DNA. The researchers say that the drugs steal the DNA binding site, preventing relaxase from handling DNA.

Although the researchers are still unsure as to how biophosphonates destroy bateria, they believe that the drugs have the potential to wipe out any E. coli carrying relaxase.

"That it killed bacteria was a surprise," Dr. Redinbo, adding that by targeting these bacteria, the drugs act like birth control and prevent antibiotic resistance from spreading.

The researcher, however, warns that the results only apply to E. coli, and that further testing will reveal whether bisphosphonates also attack similar species like Acinetobacter baumannii (hospital-acquired pneumonia), Staphylococcus aureus (staph infections), and Burkholderia (lung infections).

"We hope this discovery will help existing antibiotics or offer a new treatment for antibiotic-resistant bacteria," he said.

Dr. Redinbo said that the drugs might be most effective at sites where clinicians can best control dosage, such as skin and the gastrointestinal tract.

Source: ANI

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