Figure 3.. MvRadA-AMP-PNP, PfRad51 and SsoRadA quaternary structures. Side and top views are shown as indicated. The helical pitches of the right-handed MvRadA-AMPPNP filament, the left-handed SsoRadA filament and the overwound right-handed SsoRadA filament are 106.7 Å, 125.6 Å and 98.0 Å, respectively. The putative dsDNA binding regions or HhH motifs are highlighted in blue. The putative ssDNA binding L1 and L2 motifs are highlighted in pink and green, respectively. The helical filament axis is depicted as an orange rod running through the filament.