Data items in the PDBX_VALIDATE_MAIN_CHAIN_PLANE category list the residues that contain unexpected deviations from planes for main chain atoms as defined by the improper torsion angle describing planarity: PLANARITY = C(i-1) - CA(i-1) - N(i) - O(i-1) ==> planar < 5 as a pseudo torsion
loop_ _pdbx_validate_main_chain_plane.id _pdbx_validate_main_chain_plane.PDB_model_num _pdbx_validate_main_chain_plane.auth_comp_id _pdbx_validate_main_chain_plane.auth_asym_id _pdbx_validate_main_chain_plane.auth_seq_id _pdbx_validate_main_chain_plane.PDB_ins_code _pdbx_validate_main_chain_plane.improper_torsion_angle 1 0 TRP G 20 . 29.901 2 0 TRP G 21 . -42.450