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Definition

beta-bulge-loop
A motif of three residues within a β-sheet consisting of two H-bonds in which:
- the main-chain NH of residue(i) is H-bonded to the main-chain CO of residue(i+4) (Type 1) or residue(i+5) (Type 2)
- the main-chain CO of residue i is H-bonded to the main-chain NH of residue(i+3) (Type 1) or residue(i+4) (Type 2)
       type 1 beta-bulge loops have an RL nest at residues i+2 and i+3
       type 2 beta-bulge loops have an RL nest at residues i+3 and i+4
Comments
β-bulge loops often occur at the loop ends of β-hairpins.
 
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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