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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.
The Rules of Protein Structure. 1  The function of a protein is determined by its shape. 2  The shape of a protein is determined by its primary structure (sequence of amino acids). 3  The sequence of amino acids in a protein is determined by the sequence of nucleotides in the gene (DNA) encoding it.