Proteins are composed of amino acids that are joined by peptide bonds to form a polypeptide. The structure of proteins exists in four basic levels. They are primary, secondary, tertiary, and quaternary structures. The primary structure contains a sequence of amino acids, which are linked to each other by peptide bonds. Secondary structure is formed when the amino acids in primary structure form hydrogen bonds with other amino acids in the same or different polypeptide chain.
Tertiary structure is formed when the protein in secondary structure gets coiled on itself and the amino acids are involved in various kinds of interactions such as ionic, disulfide, and hydrophobic. Quaternary structure is formed when the actual functional protein is composed of more than one polypeptide chains.
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