chi_pi_periodic

Whether torsion angles in amino acids is symmetric invariant, that is, rotating the corresponding torsion angle 180 degrees does not affect the overall three-dimensional structure.

The length of the first dimension is 21, representing 20 different amino acids and unknown amino acids (UNK). The length of the second dimension is 4, corresponding to four torsion angles (chi1,chi2,chi3,chi4). When the corresponding amino acids contain symmetric invariant atoms, the value of the index position is 1.0.

value	amino_acid
[0.0, 0.0, 0.0, 0.0]	# ALA
[0.0, 0.0, 0.0, 0.0]	# ARG
[0.0, 0.0, 0.0, 0.0]	# ASN
[0.0, 1.0, 0.0, 0.0]	# ASP
[0.0, 0.0, 0.0, 0.0]	# CYS
[0.0, 0.0, 0.0, 0.0]	# GLN
[0.0, 0.0, 1.0, 0.0]	# GLU
[0.0, 0.0, 0.0, 0.0]	# GLY
[0.0, 0.0, 0.0, 0.0]	# HIS
[0.0, 0.0, 0.0, 0.0]	# ILE
[0.0, 0.0, 0.0, 0.0]	# LEU
[0.0, 0.0, 0.0, 0.0]	# LYS
[0.0, 0.0, 0.0, 0.0]	# MET
[0.0, 1.0, 0.0, 0.0]	# PHE
[0.0, 0.0, 0.0, 0.0]	# PRO
[0.0, 0.0, 0.0, 0.0]	# SER
[0.0, 0.0, 0.0, 0.0]	# THR
[0.0, 0.0, 0.0, 0.0]	# TRP
[0.0, 1.0, 0.0, 0.0]	# TYR
[0.0, 0.0, 0.0, 0.0]	# VAL
[0.0, 0.0, 0.0, 0.0]	# UNK