Automatic α-helix identification in Patterson maps

Caliandro, R.; Dibenedetto, D.; Cascarano, G.L.; Mazzone, A.; Nico, G.

doi:10.1107/S0907444911046282

Figure 8
Section of the power spectrum $[|G_{{\hat {\bf n}}}({\overline \nu})|^2]$ in the plane (t, [varphi]

) for 1dy5 obtained by filtering $[|G_{{\hat {\bf n}}}(\nu)|^2]$ at the characteristic frequency [nu]

for

-helix identification. The boxes are centred on the [alpha]

-helix directions calculated from the published coordinates for chain A (red) and chain B (blue). The lengths of their sides are equal to the steps used to define the grid. The dashed line indicates the restriction introduced by the space-group symmetry.