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The function of a protein is highly dependent on its 3D structure. The amino acid sequence of a polypeptide chain determines the final 3D structure of the protein. There are four levels of protein structure; the primary structure, the secondary structure, the tertiary structure, and the quaternary structure. Peptide bond, disulfide bond, their nomenclature, and their characteristics, along with the primary structure of proteins and their importance, are described. Learn about the primary structure of proteins, which is the sequence of amino acids in a polypeptide chain. Also, explore the secondary, tertiary and quaternary structures of proteins and their formation and examples. The first level of protein structure is the primary structure which is defined as the linear sequence of amino acids joined together by peptide bonds. The primary structure is maintained by peptide and disulfide bonds.
