<PreProline name="prepro" use_statistical_potential="(&bool)" residue_selector="(&residue selector)" />
Helical space (ABEGO type A) is strongly disfavored before a proline, and Rosetta energy may not capture this effect.
In the default mode, the filter simply checks the ABEGO of all residues before prolines and counts the residues that have non-B, non-E abego types (lower = better). With the "use_statistical_potential" option, the filter uses a bicubic spline fit to the data attached to guess at the favorability of a preproline residue with the given phi/psi angles -- this favorability is then returned as the filter score (lower = better).
Options
Example
<PreProline name="prepro" use_statistical_potential="0" />