Lineage for Family c.52.1.31: PA4535-like

1. Root: SCOP 1.73

2. Class c: Alpha and beta proteins (a/b) [51349] (141 folds)

3. Fold c.52: Restriction endonuclease-like [52979] (3 superfamilies) core: 3 layers, a/b/a; mixed beta-sheet of 5 strands, order 12345; strands 2 &, in some families, 5 are antiparallel to the rest

4. Superfamily c.52.1: Restriction endonuclease-like [52980] (31 families)

5. Family c.52.1.31: PA4535-like [142449] (1 protein) contains the PD motif at the beginning of strand 2 and putative catalytic glutamate in strand 3, whereas the putative catalytic lysine is migrated to an alpha-helix