that can even kill off slimy groups of bacteria called biofilms that are responsible for many hard-to-treat infections, such as those that take hold in the lungs, the bladder and on implanted medical devices.
Matthew Wook Chang and colleagues explain that biofilm infections are difficult to treat because the bacteria hide away under a protective barrier of sugars, DNA and proteins. That shield makes them very resistant to conventional therapies. In addition, overuse of antibiotics in medicine and agriculture also have made some bacteria, such as MRSA, shrug off most known treatments, making at least 2 million Americans sick every year. This growing public health threat has motivated scientists to look for new antibiotics and alternative treatments to beat infections. In the past, researchers made bacteria that fight off other microbes, but they had limitations. Chang's team addressed those limitations by making a new kind of bacterial "gun-for-hire" that can sense an infection, swim toward it and kill off the disease-causing microbes.
They reprogrammed E. coli
to sense Pseudomonas aeruginosa
a bacteria that can form biofilms and causes hospital-acquired infections in the lungs and the gut. The new E. coli
then swims directly toward P. aeruginosa
and launches an attack with an antimicrobial peptide and an enzyme that breaks down biofilms. Though the researchers successfully tested their engineered microbe on P. aeruginosa
, they say that their engineering strategy could be used to combat other pathogens as well.