This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.
Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.
Kyle Schroering Sandbox 1
From Proteopedia
The Mechanism of Trypsin
Trypsin structure contains an aspartate residue (189) in its catalytic pocket that is used to attract and stabilize the positively charged lysine and/or arginine. Therefore, the aspartate residue is responsible for the specificity of the enzyme. Trypsin cleaves protein on the carboxyl end of lysine and arginine except when they are bound to proline. Once in the small intestine, the enzyme enteropeptidase activates it into trypsin by proteolytic cleavage. The cleavage occurs within the polypeptide chain rather than at the terminal amino acids located at the ends of polypeptides.
| |||||||||
| 2age, resolution 1.15Å () | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ligands: | |||||||||
| Non-Standard Residues: | |||||||||
| Activity: | Trypsin, with EC number 3.4.21.4 | ||||||||
| Related: | 2agg, 2agi, 2ah4
| ||||||||
| |||||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||
