English: Backbone-conformation dependent interactions occur between gamma heavy atoms (Cγ,Oγ,Oγ1,Cγ1,Cγ2,Sγ) and backbone Ci-1 (carbonyl carbon of the previous amino acid), backbone Ni+1 (backbone nitrogen of the next amino acid), backbone Oi (backbone oxygen of the same amino acid), and the hydrogen bond donor to backbone Ni of the same amino acid ("hb" below, assuming linear hydrogen bond between oxygen and H-N bond). These interactions are expected to be strongly repulsive when dihedral angles connecting these heavy atoms to gamma heavy atoms occur in +60°,-60° or -60°,+60° pairs. They will occur in a range about the φ and ψ dihedrals that cause the connecting dihedrals to the backbone to be near +60° or -60° (when connecting dihedral to Xγ is -60° or +60° respectively). In each case, the dihedrals needed are of the form: X1-X2-X3-X4 and X2-X3-X4-X5. So for instance for ψ dependent interactions, the dihedrals are Ni+1-C-Cα-Cβ and C-Cα-Cβ-Xγ or ψ+120° and χ1-120° respectively. Interactions with "hb" are expected to be weak, but the backbone-dependent rotamer library does exhibit effects due to this interaction.
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