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   αβmotif
 
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Definition

alpha-beta motif
A motif of five consecutive residues and two H-bonds in which:
 
  - H-bond between CO of residue(i) and NH of residue(i+4)
  - H-bond between CO of residue(i) and NH of residue(i+3)
  - φ angles of residues(i+1), (i+2) and (i+3) are negative.
	
Comments
A common feature of the C- and N-termini of α-helices. Left-handed α-β motifs are rare.
 
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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