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Understanding a bacterial immune system one step at a time

In research published in the high impact journal Nature Structural & Molecular Biology, Andrew MacMillan and co-workers in his lab have described the first step of the immune response of bacterial cells. Scientists had previously found that a bacterial virus, called a bacteriophage, attacks a bacterial cell by injecting its DNA in to the cell. MacMillan's lab discovered the mechanism by which bacterial RNA is cut into pieces by a specific protein; these pieces then target the invading virus' DNA.

"We are starting at the beginning because we want to understand how this works and how we can use this to basically control bacterial growth," said Matt Schellenberg, a post-doctoral fellow in the MacMillan lab in the department of biochemistry in the Faculty of Medicine & Dentistry. This system could be beneficial for bacteria to fight off invasion of viruses. Alternatively, medical professionals could use knowledge of this system to help fight a human bacterial infection.

According to MacMillan they used a technique called X-ray crystallography to produce high-resolution pictures of a key step in the bacteria's immune response ā€” the production of the targeting RNAs.

"Bacteria have evolved this system to protect themselves against infection," said MacMillan.

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