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Table 3 Intrahelical hydrogen bonds observed in the crystal structure of Peptide Ac-Gly-Ala-ΔPhe-Leu-Gly-ΔPhe-Leu-Gly-ΔPhe-Ala-Gly-NH2.

From: Observation of glycine zipper and unanticipated occurrence of ambidextrous helices in the crystal structure of a chiral undecapeptide

Conformer A (left-handed 310-helix)
Type Donor (D) Acceptor (A) D...A (Å) H...A (Å) D-H...A (°)
4→1 N4A O1'A 2.799 1.96 166
  N5A O2'A 2.964 2.11 176
  N6A O3'A 2.836 1.99 167
  N7A O4'A 2.865 2.02 166
  N8A O5'A 2.874 2.03 166
  N9A O6'A 2.868 2.05 158
  N10A O7'A 2.876 2.03 170
  N11A O8'A 2.972 2.12 170
Conformer B (right-handed 310-helix)
Type Donor (D) Acceptor (A) D...A (Å) H...A (Å) D-H...A (°)
4→1 N4B O1'B 2.932 2.09 165
  N5B O2'B 2.931 2.08 171
  N6B O3'B 2.872 2.03 168
  N7B O4'B 2.897 2.04 172
  N8B O5'B 2.915 2.07 167
  N9B O6'B 2.802 1.99 157
  N10B O7'B 2.902 2.05 172
  N11B O8'B 2.899 2.06 165