β-314 Helical Rotamers

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C3 C2
D L D L
χ1 χ2 χ1 χ2 χ1 χ2 χ1 χ2

The pitch of the 314 helix (roughly 3 residues per turn) results in a triangular helical motif. The 314 helix prefers two particular substitution patterns. Both the L - C3 (green) and D - C2 (yellow) result in equatorial positioning of sidechain R groups.