Trypsin, Chymotrypsin & Elastases – What type of enzymes are they?
**Core Concept**
Trypsin, chymotrypsin, and elastases are a group of enzymes that belong to the serine protease family, specifically the trypsin-like serine proteases. These enzymes play a crucial role in the digestion of proteins in the gastrointestinal tract.
**Why the Correct Answer is Right**
These enzymes are secreted by the pancreas in an inactive form (zymogens) and are activated in the small intestine to break down proteins into smaller peptides and amino acids. Trypsin, chymotrypsin, and elastase have distinct specificities for different amino acid residues, allowing them to cleave proteins at specific sites. Trypsin cleaves after basic amino acids (lysine and arginine), chymotrypsin cleaves after aromatic amino acids (phenylalanine and tyrosine), and elastase cleaves after small, non-polar amino acids (alanine, valine, and leucine).
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because trypsin, chymotrypsin, and elastases are not glycosidases, which are enzymes that break down carbohydrate molecules.
**Option B:** This option is incorrect because trypsin, chymotrypsin, and elastases are not lipases, which are enzymes that break down fat molecules.
**Option C:** This option is incorrect because trypsin, chymotrypsin, and elastases are not DNases, which are enzymes that break down DNA molecules.
**Clinical Pearl / High-Yield Fact**
Trypsin, chymotrypsin, and elastase deficiencies can lead to pancreatic insufficiency, a condition characterized by malabsorption of proteins and fats. This condition can be treated with pancreatic enzyme supplements.
**Correct Answer: C. Serine proteases.