Study Finds Enzyme Can Kill Anthrax

NEW YORK — A bacteria-killing enzyme can detect and destroy anthrax, and it should work even if terrorists create antibiotic-resistant strains, researchers say.

The enzyme was isolated from a virus that attacks bacterial cells.

“Essentially, it cracks them open and releases all the cell contents, so the bacterial cell explodes,” said Raymond Schuch of the Rockefeller University in New York, co-author of a study published today in the journal Nature.

Ordinary anthrax responds to antibiotics, but there is concern that terrorists might develop resistant strains. The researchers suggested it would be difficult to create strains that resist the enzyme because it acts on a vital part of the bacterial wall, one that can’t easily be modified.

Schuch and colleagues reported that the enzyme, called PlyG lysin, kills anthrax bacteria in the laboratory. When they infected 19 mice with a related kind of bacteria that could kill them in five hours, prompt treatment with PlyG saved 13 of the animals.

They also found that spores of this anthrax-related bacteria could be quickly detected using PlyG and a hand-held device.

The PlyG enzyme possibly could be made into a drug that would hunt down anthrax bacteria as they begin to infect a person or an animal, said Stephen Morse, a Columbia University molecular biologist and former program manager of the advanced diagnostics program at the Defense Advanced Research Projects Agency.

“As always, it will take some time to fully develop and validate this approach to make sure it has therapeutic value, but it’s very promising,” Morse said.

Phil Hanna, a University of Michigan microbiologist who specializes in anthrax, said the next step will be further animal tests to see whether the enzyme can halt an anthrax infection.

The key, Hanna said, is early treatment before the bacteria produce enough toxins to kill healthy cells and tissue. This is also the case with conventional antibiotics used against anthrax.