Lineage for Superfamily c.56.2: Purine and uridine phosphorylases

1. Root: SCOP 1.69

2. Class c: Alpha and beta proteins (a/b) [51349] (136 folds)

3. Fold c.56: Phosphorylase/hydrolase-like [53162] (6 superfamilies) core: 3 layers, a/b/a ; mixed sheet of 5 strands: order 21354; strand 4 is antiparallel to the rest; contains crossover loops

4. Superfamily c.56.2: Purine and uridine phosphorylases [53167] (1 family) complex architecture; contains mixed beta-sheet of 8 strands, order 23415867, strands 3, 6 & 7 are antiparallel to the rest; and barrel, closed; n=5, S=8