From Proteopedia
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Trypsin
Trypsin is a serine protease that is used in the body to hydrolyze proteins. It is produced in the pancreas as its inactive zymogen form trypsinogen. It is produced inactively so as to not destroy the organ that produces it. Trypsin is used to cleave peptide bonds in proteins on the carboxyl side of the arginine or lysine. The exception to this is when either is followed by a proline, due to steric hindrance. Its optimal operating temperature is 37° C and around a pH of 8
Structure
Trypsin is composed of 229 amino acids. Its is composed of two alpha helices (pink) and two beta sheets (yellow).