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A: The enzymes that break down protein include trypsin, chymotrypsin, pepsin, thermolysin, glutamyl endopeptidase, elastase, bromelain and papain. Trypsin, pepsin, elastase, thermolysin, glutamyl, endopeptidase and chymotrypsin are made in the human body. Bromelain comes from pineapples and papain comes from papayas.
Enzymes. An enzyme is a protein that functions as a biological catalyst â a substance that speeds up a chemical reaction without being changed by the reaction. Lock and key model . Enzymes are folded into complex shapes that allow smaller molecules to fit into them. The place where these molecules fit is called the active site.