Researchers are increasingly exploring bacteriophage therapy as a treatment approach for bacterial infections, particularly those resistant to conventional antibiotics. These viruses specifically target bacterial cells while leaving human cells unharmed. However, bacteria possess their own defense mechanisms that can neutralize phages, and understanding these defenses is critical for developing more effective therapeutic applications.
A team of researchers led by Sam Hobbs at University of Utah Health has identified a previously unknown mechanism by which bacteria detect viral infections. The study focused on a bacterial immune system called CBASS, which functions as a last-resort defense capable of triggering cell death to prevent viral propagation to neighboring cells. Because this response is fatal to the infected bacterium, the detection system must distinguish genuine threats from false alarms with high precision.
The researchers discovered that the detection process relies on an enzyme produced by certain phages. When this viral protease acts directly on a host protein within the bacterial cell, it generates a signal that activates the entire CBASS defense pathway. This mechanism differs from related antiviral immune systems, which typically recognize viral genetic material directly. According to Hobbs, this represents an entirely novel way these host proteins become activated.
The findings have implications extending beyond bacteriophage therapy. CBASS is related to an antiviral immune pathway found in humans, suggesting that aspects of this defense have been preserved through billions of years of evolution. The connection indicates the pathway originated in the common ancestor of bacteria and humans. This evolutionary conservation underscores the pathway’s fundamental importance in viral defense across diverse organisms. The research was published in Science and supported by multiple biomedical research funding organizations.
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