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Definition

beta-bulge
A motif of three residues within a β-sheet in which the main chains of two consecutive residues are H-bonded to that of the third, and in which the dihedral angles are as follows:

   residue(i):   -140° < φ < -20°     -90° < ψ < 40°
   residue(i+1): -180° < φ < -25° or  120° < φ < 180°
                   40° < ψ < 180° or -180° < ψ < -120°
Comments
Classic β-bulges are mostly found at the edges of the sheets.
 
structural motifs:
  alpha-beta-motif     asx-motif     asx-turn-iil  
  asx-turn-iir     asx-turn-il     asx-turn-ir  
  beta-bulge     beta-bulge-loop-5     beta-bulge-loop-6  
  beta-turn-iil     beta-turn-iir     beta-turn-il  
  beta-turn-ir     gamma-turn-classic     gamma-turn-inverse  
  nest-lr     nest-rl     niche-3l  
  niche-3r     niche-4l     niche-4r  
  schellmann-loop-6     schellmann-loop-7     st-motif  
  st-staple     st-turn-iil     st-turn-iir  
  st-turn-il     st-turn-ir  

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