Gosset Alpha-chymotrypsin Overview
Alpha-chymotrypsin is a serine protease enzyme produced in the pancreas as an inactive precursor (chymotrypsinogen) and activated in the duodenum by trypsin cleavage. It catalyzes the hydrolysis of peptide bonds on the carboxyl side of large hydrophobic amino acids such as phenylalanine, tryptophan, and tyrosine, playing a critical role in protein digestion. Structurally, it is characterized by three peptide chains held together by disulfide bonds and a catalytic triad (serine, histidine, aspartate) that orchestrates nucleophilic attack on peptide substrates. Besides its digestive role, alpha-chymotrypsin is used therapeutically as an anti-inflammatory and proteolytic agent in surgery, particularly ophthalmic procedures. Loss of enzyme activity can occur due to denaturation from heat or pH changes, and allergic or irritant reactions may rarely limit its clinical use[1][2][3][4][5][7].
Mechanism of Action
Proteolytic cleavage of peptide bonds C-terminal to aromatic amino acids (tyrosine, tryptophan, phenylalanine) in proteins and polypeptides, via a covalent hydrolysis (ping-pong) mechanism involving a catalytic triad (Ser195, His57, Asp102)[1][2][3][5]
Biological Functions
Disease Associations
Safety Considerations
- Allergic reactions (rare, in some patients upon administration)
- Potential for local tissue irritation
- instability at extremes of pH or temperature
- loss of enzyme activity due to denaturation at high temperature or improper storage[4][6][7]
Interacting Drugs
Associated Biomarkers
| Biomarker |
|---|
| None commonly used for patient selection or efficacy monitoring |