Lineage for Family a.25.4.1: PE

1. Root: SCOP 1.75

2. Class a: All alpha proteins [46456] (284 folds)

3. Fold a.25: Ferritin-like [47239] (6 superfamilies) core: 4 helices; bundle, closed, left-handed twist; 1 crossover connection

4. Superfamily a.25.4: PE/PPE dimer-like [140459] (2 families) (hetero)dimer of alpha-hairpin subunits similar to that of the half-ferritin family; no bound metals inside the bundle

5. Family a.25.4.1: PE [140460] (1 protein) Pfam PF00934; pairs with with the N-terminal hairpin of PPE