Bond Angles and Conformations
| 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 = 0º is a cis
peptide bond and omega = 180º is a trans peptide bond.