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Full Text. Each protein has its own unique sequence of amino acids and the interactions between these amino acids create a specify shape. This shape determines the protein's function, from digesting protein in the stomach to carrying oxygen in the blood. Changing the Shape of a Protein.
1 Protein structure plays a key role in its function; if a protein loses its shape at any structural level, it may no longer be functional. 2  Primary structure is the amino acid sequence.  Secondary structure is local interactions between stretches of a polypeptide chain and includes Î±-helix and Î²-pleated sheet structures.