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   niche4l
 
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Definition

niche 4l
A motif of 4 consecutive residues with dihedral angles as follows:
   residue (i-1): no limitations on φ/ψ
   residue   (i):  -160° < φ < -30°    90° < ψ < 180°
   residue (i+1):    50° < φ < 140°   -40° < ψ <  50°
   residue (i+2):  -160° < φ < -30°    90° < ψ < 180°
Comments
According to these definitions, virtually all niche4s incorporate a niche3 (residues i+1 and i+2 of the niche4 are i and i+1 of a niche3). This version of the database contains motifs with the amended definition. The criteria used was that the distance between i-1 and i+2 Oxygen atoms must be within 4.5 Å, both C-O vectors must look towards each other and the residues must not fall into the helical region.
 
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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