Peptide backbone dihedral angles
= Peptide backbone dihedral angles
{title2=$\phi,\psi$}
The <peptide backbone dihedral angles> are $\phi=\angle(C^{\prime}_{i-1},N_i,C_{\alpha i},C^{\prime}_i)$ and $\psi=\angle(N_i,C_{\alpha i},C^{\prime}_i,N_{i+1})$. Rotation is restricted by ring closure, <peptide> geometry and steric contacts.