Bacteria turn a virus’ own weapon against it

Scientists searching for new ways to treat bacterial infections are increasingly turning to viruses known as bacteriophages (phages). These viruses specifically target bacteria, allowing them to kill harmful microbes without damaging human cells. They can also attack bacteria that have developed resistance to antibiotics.

Phage therapy, however, faces a major obstacle. Bacteria are not defenseless against viruses. They have evolved their own immune systems, and understanding those defenses could help scientists develop therapeutic phages that are better able to overcome them.

New research has now identified an important way bacteria recognize a viral attack. Scientists found that a viral enzyme cuts a crucial sensor molecule inside the bacterial cell. That damage serves as an alarm, activating an immune response. The discovery could ultimately help researchers develop more effective phage therapies capable of avoiding bacterial immune defenses.