Cow Enzyme Defeats Drug-Resistant Superbugs

Drug-resistant bacteria that shrug off antibiotics may have finally met their match in an unlikely source: the cow's stomach.

Researchers at the Indian Institute of Science in Bangalore isolated an enzyme called CRhAB that breaks down the protective biofilms used by two notorious hospital superbugs. These sticky bacterial shields have made infections increasingly difficult to treat as antibiotic resistance spreads worldwide.

The enzyme targets Klebsiella pneumoniae and Acinetobacter baumannii, both members of the ESKAPE pathogen group. These bacteria cause serious infections in hospitals, particularly in wounds and on medical equipment, and they've developed alarming resistance to standard treatments.

Professor Dipshikha Chakravortty and her team tested the enzyme on mice with infected wounds using special gauze soaked with CRhAB. The biofilms broke down, leaving the bacteria vulnerable to antibiotics and the body's immune system.

Getting the mice to keep the bandages on proved surprisingly challenging. "The mice naturally tried to remove the dressing," Chakravortty explained. The team had to redesign their experiment setup to keep the gauze in place without stressing the animals.

This breakthrough builds on similar work from 2024, when IISc researchers found another cow enzyme effective against K. pneumoniae alone. The new enzyme works against multiple bacterial species, making it more versatile for real-world medical applications.

The Ripple Effect

The research team is already developing practical applications that could help millions of patients. They're designing wound dressings specifically for diabetic foot infections, which affect roughly one in four diabetes patients and often resist conventional treatment.

Even more ambitious, the scientists are exploring ways to deliver the enzyme through inhalation for respiratory infections. This could offer new hope for patients with pneumonia caused by drug-resistant bacteria, particularly those on ventilators in intensive care units.

The discovery comes at a critical time. The World Health Organization has identified antibiotic resistance as one of the top ten global public health threats, with drug-resistant infections already causing hundreds of thousands of deaths annually.

What makes this approach particularly promising is that it doesn't kill bacteria directly. Instead, it strips away their defenses, allowing existing antibiotics to work again. This strategy could extend the usefulness of drugs that have saved countless lives but are losing effectiveness.

The research, published in the prestigious journal Nature, represents years of painstaking work isolating and testing enzymes from cow digestive systems. Cows naturally break down complex plant materials, and their gut enzymes have evolved to tackle tough molecular structures similar to bacterial biofilms.

Clinical trials in humans will be the next step before these treatments reach patients, but the mouse studies provide strong evidence that the approach works in living organisms.