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Definition

schelmann loop
A motif of six consecutive residues (common type) or seven consecutive residues (wide type) that contains two H-bonds in which:
- the main-chain CO of residue(i) is H-bonded to the main-chain NH of residue(i+5) (common type) or residue(i+6) (wide type)
- the main-chain CO of residue(i+1) is H-bonded to the main-chain NH of residue(i+4) (common type) or residue(i+5) (wide type)
Comments
The Schellman Loop is also known as the ‘Paperclip’. The left-handed form (LR) is rare. The common Schellman Loop contains an RL Nest at positions (i+3) and (i+4), whereas the wide type contains one at positions (i+4) and (i+5). Schellman Loops are a common feature of the C-termini of α-helices. A Schellman Loop of the common type is illustrated.
 
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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