Predict where the structural differences would occur between an-pep and other enzymes that do not digest the peptides.

AN-PEP enzyme refers to a dietary supplement, which has been shown to dissociate gluten in the stomach. It has been proven to help the individuals suffering from Gluten sensitivity or Celiac disease. The scientific name of the enzyme is Aspergillus Niger prolyl endoprotease.  

However, certain structural differences would take place between AN-PEP, which prevent the enzyme from digesting the peptides. Some of the differences like amino acid differences would be expected in the active site, and in the regions, which influence the folded composition of the active site.