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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 are catalytic proteins that speed up chemical reactions. Without enzymes, biological reactions would occur at a much slower rate or not at all. Like other proteins, enzymes are made of long chains of amino acids held together by peptide bonds. Enzyme Substrate Complex.