Fold: Metallo-dependent phosphatases

4 layers: alpha/beta/beta/alpha; mixed beta sheets; contains duplication

Lineage:

1. Root: scop
2. Class: Alpha and beta proteins (a+b)
   Mainly antiparallel beta sheets (segregated alpha and beta regions)
3. Fold: Metallo-dependent phosphatases
   4 layers: alpha/beta/beta/alpha; mixed beta sheets; contains duplication

Superfamilies:

1. Metallo-dependent phosphatases (3)
   1. Purple acid phosphatase (3)
   2. 5'-nucleotidase (syn. UDP-sugar hydrolase), N-terminal domain (1)
   3. Protein serine/threonine phosphatase (3)