A group of specialized protein molecules, primarily secreted by the pancreas and the mucosal lining of the gastrointestinal tract, whose essential function is to catalyze the breakdown of complex macronutrients into smaller, absorbable units. Key classes include amylases for carbohydrates, proteases for proteins, and lipases for fats. Optimal enzyme activity is paramount for nutrient assimilation, which directly supports the synthesis of hormones and neurotransmitters.
Origin
The term combines “digestive,” relating to the process of breaking down food, with “enzymes,” derived from the Greek enzymos, meaning “in leaven,” reflecting their function as biological catalysts. The understanding of these specific catalysts revolutionized nutritional science and the clinical management of malabsorption syndromes.
Mechanism
Enzymes operate through a lock-and-key model, binding to specific substrates to facilitate hydrolysis, the chemical reaction that uses water to break molecular bonds. In the small intestine, pancreatic enzymes are released in response to hormonal signals like cholecystokinin. Inadequate production or secretion of these enzymes compromises the availability of essential amino acids and fatty acids, which are the fundamental building blocks for all endocrine signaling molecules.
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