Chopping up a microbial tail
By John Travis
From Washington, D.C., at a meeting of the American Society for Microbiology
Many disease-causing bacteria sport whiplike flagella that propel their movement. Scientists have now found that an enzyme produced by immune cells called neutrophils can chop up flagellin, the main protein in these tails.
Neutrophils are usually among the first immune cells to encounter bacteria. These cells use the enzyme neutrophil elastase to tear up the microbes’ membranes. Neutrophil elastase also rips apart flagellin, report Yolanda S. Lopez-Boado of Wake Forest University School of Medicine in Winston-Salem, N.C., and her colleagues. In test-tube studies, the enzyme can destroy flagellin whether it’s part of a bacterium’s flagella or just free-floating in a solution.