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Definition

st-turn
A motif of two consecutive residues with dihedral angles as follows (for the RL form):

Sub-categories
Type RL
   residue(i):   -140° < φ < -20°   -90° < ψ < 40°
   residue(i+1):   20° < φ < 140°   -40° < ψ < 90°
Type LR
   In LR nests the φ and ψ values for (i) and (i+1) are interchanged.

Nest should not have Proline as any residue.
Comments
The Nest can form a binding site for an anionic group (the ‘egg’). Nests frequently occur as parts of other motifs such as Schellmann loops.
 
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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