Conformation Phi Psi Omega Residues per turn Translation per residue
Antiparallel beta -139 +135 -178 2.0 3.4
Parallel beta -119 +113 180 2.0 3.2
alpha helix -57 -47 180 3.6 1.5
3-10 helix -49 -26 180 3.0 2.0
Xi-helix -57 -70 180 4.4 1.15
Polyproline I -83 +158 0 3.33 1.9
Polyproline II -78 +149 180 3.0 3.12
Polyproline III -80 +150 180 3.0 3.1

A diagram showing the dihedral bond angles for regular polypeptide conformations.
Note: omega = 0 is a cis peptide bond and omega = 180 is a trans peptide bond.
Contents