![]() Finally some protein macromolecules are comprised of several protein subunits and the overall arrangement is known as the quaternary structure, e.g. As these folded twisted chains are further organized into larger crystals (etc.) the arrangement is called the tertiary structure. A typical example is the α-helix, the simplest secondary structure of proteins (helical form). ![]() The basic chains are then folded and twisted in complex ways to form the secondary structure. The sequence of amino acids in the protein chain is called the primary structure. Glycoproteins are proteins with a carbohydrate component and lipoproteins are proteins with a lipid component. Conversely, chains of approximately 100 amino acids or more are termed proteins 1. A peptide bond is formed by the carboxyl group of one amino acid linking to the amino group of the next one.Īrbitrarily proteins are categorized according to length of the amino acid chain: if less than one hundred amino acids, then they are peptides, subdivided into oligopeptides (2-10 amino acids) and polypeptides (11-99 amino acids).
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