Master service agreement. [hide]This article has multiple issues. Please help improve it or discuss these issues on the talk page. This article needs more links to other articles to help integrate it into the encyclopedia. Please help improve this article by adding links that are relevant to the context within the existing text.
#4. The R represents the side chain of the amino acids which make up the anti-parallel beta sheet. Since a wide variety of side chains can exist on a beta -sheet, they generalize the structure by writing Rs instead of specific amino acid side chains.
Based on the R-group structures, identify each amino acid residue and specify the sequence of amino acids in this peptide. Now select protein-sidechain; then select-change color to and pick a color. This will give the R-groups a color distinct from the CPK-colored backbone atoms.Select protein-protein.n an a-helix, the amino acid R-groups protrude out from the helically coiled polypeptide backbone. The surface of an a-helix largely consists of the R-groups of amino acid residues. At right, an a-helix is shown end-on and from the side.