Lineage for Species: Escherichia coli [TaxId: 331111]

1. Root: SCOPe 2.07

2. Class c: Alpha and beta proteins (a/b) [51349] (148 folds)

3. Fold c.56: Phosphorylase/hydrolase-like [53162] (8 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] (2 families) 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

5. Family c.56.2.1: Purine and uridine phosphorylases [53168] (7 protein domains)

6. Protein Purine nucleoside phosphorylase, PNP [53169] (13 species)

7. Species Escherichia coli [TaxId:331111] [329984] (1 PDB entry)