Angle Combinations - Fig 3 shows a plot of the phi and psi...

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Angle Combinations The conformation of the phi and psi angles shown in Fig. 2 obviously does not exist because of the steric hinderance between the H and O groups from the adjacent planes. When angles of phi and psi are monitored in natural polypeptides and proteins, it is found that these two angles tend to be restricted to certain combinations of angles.
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Unformatted text preview: Fig. 3 shows a plot of the phi and psi angles from over 300 residues naturally occuring in polypeptides. Summary: Even though the peptide planes have the potential to assume any angle around the alpha carbon, they do not because certain combinations of Phi and Psi angles...
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