R groups are the side chain of an amino acid. R groups determine the properties of amino acids. There are 4 common side chains: acidic, basic, nonpolar and uncharged polar. The R groups also determine the type of bonds and interactions formed when polypeptide chain folds into its tertiary structure.
- ↑ Becker, W.M., Kleinsmith, L.J., Hardin, J. and Bertoni, G.P. (2009) The World of the Cell. 7th edn. California, USA: Pearson Benjamin Cummings.