Test180919: Difference between revisions

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==== Cis peptide bonds ====
==== Cis peptide bonds ====


The ω torsion angle can adopt a value close to 0° (cis-conformation), when a Pro residue is the following residue (Xaa-Pro peptide bond). In this situation a <scene name='82/824563/Pro_213_in_cis_conformation/1'>cis-Pro</scene> and a <scene name='User:Tilman_Schirmer/Sandbox_99/Pro_211_in_trans_conformation/2'>trans-Pro</scene> are similarily unfavorable, since there is a steric clash between Cα,i  with Cα,i+1 or Cδ,i+1, respectively. Conversely, the carbonyl O of residue i is in tight juxtaposition with Cδ,i+1 or Cα,i+1 (note that latter tight contact occurs in any trans peptide bond).
The ω torsion angle can adopt a value close to 0° (cis-conformation), when a Pro residue is the following residue (Xaa-Pro peptide bond). In this situation a <scene name='82/824563/Pro_213_in_cis_conformation/1'>cis-Pro</scene> and a <scene name='82/824563/Pro_211_in_trans_conformation/1'>trans-Pro</scene> are similarily unfavorable, since there is a steric clash between Cα,i  with Cα,i+1 or Cδ,i+1, respectively. Conversely, the carbonyl O of residue i is in tight juxtaposition with Cδ,i+1 or Cα,i+1 (note that latter tight contact occurs in any trans peptide bond).




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