Lineage for Species: SARS coronavirus [TaxId: 227859]

1. Root: SCOP 1.73

2. Class d: Alpha and beta proteins (a+b) [53931] (334 folds)

3. Fold d.294: EndoU-like [142876] (1 superfamily) comprises several helices and two three-stranded antiparallel beta-sheets; similar architecture to the RNase A-like fold (scop_cf 54075)

4. Superfamily d.294.1: EndoU-like [142877] (2 families) similarity to the RNase A-like superfamily (scop_sf 54076) extends to the active site location and architecture; the two structural cores of the RNase A and EndoU superfamilies are interrelated by a topological permutation - transposition of two pereferial beta-strands, suggesting possible distant homology of the two superfamilies (and their unification in a hyperfamily)

5. Family d.294.1.2: Nsp15 C-terminal domain-like [142881] (1 protein) PfamB 001946

6. Protein Nsp15, C-terminal domain [142882] (2 species)

7. Species SARS coronavirus [TaxId:227859] [142883] (1 PDB entry)