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Table 4 Intermolecular hydrogen bonds observed in the crystal structure of the peptide.

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

Conformer A
Type Donor (D) Acceptor (A) D.A (Å) H...A (Å) D-H...A (°) Symmetry
Lateral N1A O11'B 2.807 1.99 159 x+1, y-1, z
Leu-Leu interface       
Head-to-tail N2A O10'A 2.737 2.09 132 x, y, z+1
  N12A O1A 3.106 2.26 170 x+1,y, z-1
Tail-to-tail       
  N12A O9'B 2.877 2.04 165 x+1,y, z-1
Lateral C3D2A O6'B 3.224 2.36 154  
ΔPhe-ΔPhe C6D2A O3'B 3.260 2.38 158  
Interface C9D2A O1B 3.370 2.80 120  
  C2AA O8'B 3.304 2.60 129 x+1, y, z
Gly-Gly C5AA O5'B 3.215 2.54 127 x+1, y, z
Interface C8AA O2'B 3.368 2.71 126 x+1,y,z
Solvent N3A O1W 2.876 2.03 166  
  C9D2A O2W 3.426 2.50 176  
Conformer B
Type Donor (D) Acceptor (A) D.A (Å) H...A (Å) D-H...A (°) Symmetry
Lateral N1B O11'A 2.771 1.95 159 x-1, y+1, z
Leu-Leu interface       
Head-to-tail N2B O10'B 2.854 2.02 165 x, y, z-1
  N12B O1B 3.065 2.22 168 x-1, y, z+1
Tail-to-tail       
  N12B O9'A 3.009 2.19 160 x-1, y, z+1
Lateral C3D2B O6'A 3.433 2.57 154  
ΔPhe-ΔPhe C6D2B O3'A 3.405 2.53 157  
Interface C9D2B O1A 3.508 2.98 118  
Gly-Gly C5AB O5'A 3.271 2.66 121 x-1, y, z
Interface C8AB O2'A 3.475 2.89 120 x-1, y, z
Solvent N3B O2W 2.922 2.08 168  
  C9D2B O1W 3.417 2.51 166