The tertiary structure is determined by the interactions of R groups such as disulfide bonds and salt bridges, and determines the three-dimensional shape of the protein.
The overall three-dimensional structure of a polypeptide is called its tertiary structure. The tertiary structure is primarily due to interactions between the R groups of the amino acids that make up the protein. The interactions among R groups creates the complex three-dimensional tertiary structure of a protein.
The nature of the R groups found in the amino acids can counteract the formation of the hydrogen bonds described for standard secondary structures. The R groups have a variety of shapes, sizes, charges, and reactivities. This allows amino acids to be grouped according to the chemical properties of their side chains.
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