Fold: Zincin-like

contains mixed beta sheet with connection over free side of the sheet

Lineage:

1. Root: scop
2. Class: Alpha and beta proteins (a+b)
   Mainly antiparallel beta sheets (segregated alpha and beta regions)
3. Fold: Zincin-like
   contains mixed beta sheet with connection over free side of the sheet

Superfamilies:

1. Metalloproteases ("zincins"), catalytic domain (11)
2. Bacterial chitobiase, Domain 2 (1)
   contains similar fold but lacks its catalytic centre