Proteases - GCSE Biology Definition

Proteases are enzymes that break down proteins into smaller molecules called amino acids. They act like scissors, cutting proteins at specific points. Proteases are important for digestion—for example, they help break down protein in food so the body can absorb the amino acids. They also play roles in other biological processes like cell repair and defence against infection. Proteases are found in the cells of all living organisms, as well as many places in the human body, including the stomach and small intestine.