Why is meat tough? Muscles have to endure a lot of mechanical stress; they are made of strong fibers that make them hard to cut, and tough connective tissue holds them together. Individual muscle cells contain microscopic fibrils that give them their structural integrity and allow them to contract. The fibrils have a complex internal structure bound together by long protein chains. The connective tissue that holds the muscle together is also mostly protein.
How does papain tenderize meat? Papain cuts the protein chains in the fibrils and also in the connective tissue, disrupting the structural integrity of the muscle fiber, and tenderizing the meat.
|A database that shows structural and evolutionary relationships for all proteins whose structures are known. Entries include RasMol and Chime 3D models and links to additional databases.|
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