Fold: Cysteine proteinases [54000]
consists of one alpha-helix and 4 strands of antiparallel beta-sheet and contains the catalytic triad Cys-His-Asn
Superfamily: Cysteine proteinases [54001]
the constitute families differ by insertion into and circular permutation of the common catalytic core made of one alpha-helix and 3-strands of beta-sheet uperfamily