New insight into the binding mode of peptide ligands at Urotensin-II receptor: structure-activity relationships study on P5U and urantide

J Med Chem. 2009 Jul 9;52(13):3927-40. doi: 10.1021/jm900148c.


Urotensin II (U-II) is a disulfide bridged peptide hormone identified as the ligand of a G protein-coupled receptor. Human U-II (H-Glu-Thr-Pro-Asp-c[Cys-Phe-Trp-Lys-Tyr-Cys]-Val-OH) has been described as the most potent vasoconstrictor compound identified to date. We have recently identified both a superagonist of hU-II termed P5U (H-Asp-c[Pen-Phe-Trp-Lys-Tyr-Cys]-Val-OH) and the compound termed urantide (H-Asp-c[Pen-Phe-DTrp-Orn-Tyr-Cys]-Val-OH), which is the most potent UT receptor peptide antagonist described to date. In the present study, we have synthesized several analogues of P5U and urantide in which the Asp(4) residue in N-terminus position was replaced with coded and noncoded amino acids. The replacement of the Asp(4) residue by Tic led to an analogue, compound 14, more potent as antagonist (pK(B) = 8.94) compared to urantide. Furthermore, a different SAR was observed for the P5U compared to the urantide analogues. NMR and docking studies revealed a different binding mode for the agonist and antagonist ligands which could explain the observed SAR.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Line
  • Computer Simulation
  • Humans
  • Ligands
  • Magnetic Resonance Spectroscopy
  • Oligopeptides / chemistry*
  • Oligopeptides / pharmacology
  • Peptide Fragments / chemistry
  • Peptide Fragments / pharmacology
  • Peptides, Cyclic / chemistry
  • Peptides, Cyclic / pharmacology
  • Protein Binding
  • Receptors, G-Protein-Coupled / agonists*
  • Receptors, G-Protein-Coupled / antagonists & inhibitors*
  • Receptors, G-Protein-Coupled / chemistry
  • Structure-Activity Relationship
  • Urotensins / chemistry
  • Urotensins / pharmacology


  • Ligands
  • Oligopeptides
  • Peptide Fragments
  • Peptides, Cyclic
  • Receptors, G-Protein-Coupled
  • UTS2R protein, human
  • Urotensins
  • aspartyl-cyclo(penicillamyl-phenylalanyl-tryptophyl-lysyl-tyrosyl-cysteinyl)valine
  • urotensin II (4-11), Pen(5)-Trp(7)-Orn(8)-