Figure 2
Orientation angles. The three orientation angles mu(μ), theta(θ) and rho(ρ) between any pair of residues in a protein. In the 3D structure of the protein, considering any two residues A and B, θAB represents the dihedral angle between the vectors NA—> CαA and CβA—> CβB along the axis of CαA—> CβA. ρAB represents the angle between the vectors CβA—> CαA and CβA—> CβB. θ and ρ depends on the order of residue and thus are asymmetric. μ represents the dihedral angle between the vectors CαA—> CβA and CβA—> CαB along the axis of CβA—> CβB. These orientation angles help in representing the direction of residue A to residue B and vice-versa. The orientation angles were originally described in Yang et al.23 We used different notations of angles from them to prevent confusion with conventionally used angle notation.
