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1. fourth in order. 2. containing four elements or groups. quaternary. 1 adj, pertaining to a chemical compound in which four atoms or groups of elements are bonded to one atom, such as a quaternary ammonium compound in which four organic radicals are substituted for the four hydrogen molecules on an ammonium ion.
1 Quaternary Structure-refers to the structure of a protein macromolecule formed by interactions between multiple polypeptide chains. 2  Each polypeptide chain is referred to as a subunit. 3  Proteins with quaternary structure may consist of more than one of the same type of protein subunit. There are two types of secondary structures observed in proteins. 2  One type is the alpha (Î±) helix structure. 3  This structure resembles a coiled spring and is secured by hydrogen bonding in the polypeptide chain.