Structure of the gangrene alpha-toxin: the beauty in the beast.

The crystal and molecular structure of the Clostridium perfringens alpha-toxin crowns over a century-long research into the mechanisms of pathogenesis of gas gangrene. The structure reveals a two-domain enzyme, with a catalytic all-helical N-terminal domain, and a C-terminal domain similar in its jelly-roll topology to those found in pancreatic lipase and lipoxygenases.