proteinase omega shares 148 identical amino-acid residues ( 68.5 % ) with papain and 108 ones ( 50 % ) with actinidin , including the three disulfide bridges and the free cysteine residue required for activity , as well as most of the other amino-acid residues involved in the catalytic mechanism and two thirds of the glycine residues which are of structural significance .
C0002520
amino-acid
C0017890
glycine