Fig. 3.

Crystal structure of pyocin DNase–Immunity protein complexes.

Identical views of the pyocin AP41 DNase–ImAP41 (A) and pyocin S2 DNase–ImS2 (B) complexes shown in cartoon representation. AP41 DNase and Im coloured blue and light blue, respectively; S2 DNase and Im coloured orange and light orange, respectively. In both complexes, the DNase domains adopt the typical mixed α/β DNase fold whilst the Im is a four-helix bundle.