Fig. 5
From: Reciprocal carbonyl–carbonyl interactions in small molecules and proteins
Ramachandran plots and analyses of reciprocal interactions in proteins. a Ramachandran plot generated by plotting torsion angles (φ, ψ) of all residues in 2184 protein structures (blue) and torsion angles (φ, ψ) of the residue between the two interacting carbonyl groups involved in reciprocal C═O···C═O interactions (yellow). b Ramachandran plot generated by plotting torsion angles (φ, ψ) of all residues in 2184 protein structures (blue) and torsion angles (φ, ψ) of the residue between the two interacting carbonyl groups involved in reciprocal C═O···C═O interactions present only in the coil regions (yellow). c Plot showing percentage distribution of amino acids involved in reciprocal C═O···C═O interactions. d Plot showing percentage distribution of amino acid pairs involved in reciprocal C═O···C═O interactions
