Fold: Pentein, beta/alpha-propeller

duplication: composed of 5 alpha-beta(2)-alpha-beta units arranged around pseudo fivefold axis

Lineage:

1. Root: scop
2. Class: Alpha and beta proteins (a+b)
   Mainly antiparallel beta sheets (segregated alpha and beta regions)
3. Fold: Pentein, beta/alpha-propeller
   duplication: composed of 5 alpha-beta(2)-alpha-beta units arranged around pseudo fivefold axis

Superfamilies:

1. Pentein (2)
   1. Ribosome anti-association factor eIF6 (aIF6) (2)
   2. Amidinotransferase (2)
      common fold is elaborated with many active site-forminging insertions