dihedral_backbone#

biotite.structure.dihedral_backbone(atom_array)[source]#

Measure the characteristic backbone dihedral angles of a chain.

Parameters:
atoms: AtomArray or AtomArrayStack

The protein structure to measure the dihedral angles for. For missing backbone atoms the corresponding angles are NaN.

Returns:
phi, psi, omegandarray

An array containing the 3 backbone dihedral angles for every CA atom. phi is not defined at the N-terminus, psi and omega are not defined at the C-terminus. In these places the arrays have NaN values. If an AtomArrayStack is given, the output angles are 2-dimensional, the first dimension corresponds to the model number.