Trypsin is a serine protease that catalyzes acyl peptide bonds. It is specific for positively charged residues. The and are located in the active site of the trypsin. The role of asp 102 and his 57 during Trypsin catalysis is to effectively function as a proton shuttle. Location of residue which shows the beta sheet regular secondary structure. The trypsin mechanism is defined by 2 separate reactions. The mechanism begins by the breaking of the scissile bond in the substrate polypeptide. A tetrahedral intermediate forms followed by an acyl-enzyme intermediate. The C terminus then departs followed by the creation of an additional tetrahedral intermediate. Finally the N terminus of the substrate polypeptide exits, leaving the active enzyme. Trypsin also contains a to either split a substrate or transfer a substrate. The triad in trypsin consists of histidine, aspartate, and serine. In addition to this triad Trypsin also contains an to stabilize charge in between glycine and serine when the anionic carbonyl oxygen of the scissile peptide approaches. Finally in the creation of trypsin the specificity pocket leads to a binding preference for lysine or arginine. [1]
Function
Trypsin functions to convert peptides into smaller amino acids through a hydrolysis reaction. Trypsin also is linked to pancreatic cancer.
Structural highlights
Structure also includes sulfate, carbonyl, and Calcium .
