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Researchers developed novel photoresponsive ligands targeting the neuropeptide Y (NPY) Y4 receptor, a potential obesity treatment. Replacing flexible linkers with rigid photochromic ones maintained high receptor affinity, suggesting linker flexibility is less critical for potent Y4 receptor agonists.

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Area of Science:

  • Pharmacology
  • Medicinal Chemistry
  • Molecular Biology

Background:

  • The neuropeptide Y (NPY) Y4 receptor (Y4R) is a G protein-coupled receptor targeted by pancreatic polypeptide.
  • Selective Y4R agonists are investigated as potential therapeutics for obesity treatment.
  • Dimeric peptidic Y4R agonists with flexible aliphatic linkers show high potency.

Purpose of the Study:

  • To synthesize and characterize photoresponsive Y4R ligands with rigid photochromic linkers.
  • To explore the structural requirements for Y4R binding using photochromic linkers.
  • To assess the impact of linker rigidity on Y4R ligand affinity and activity.

Main Methods:

  • Synthesis of dimeric peptidic ligands incorporating photochromic chromophores (azobenzene, azopyrazole, diethienylethene, fulgimide).
  • Evaluation of Y4R binding affinity for synthesized ligands.
  • Assessment of photoisomer-dependent differences in affinity and activity.

Main Results:

  • Synthesized photoresponsive Y4R ligands with rigid photochromic linkers exhibited high Y4R affinity.
  • Replacement of flexible aliphatic linkers with rigid photochromic linkers was well-tolerated for Y4R binding.
  • Differences in affinity and activity between photoisomers were marginal, indicating linker flexibility is not critical.

Conclusions:

  • Rigid photochromic linkers can be successfully incorporated into dimeric Y4R agonists without compromising binding affinity.
  • The linking element's flexibility is less critical for achieving high-affinity binding to the Y4 receptor.
  • These findings provide insights into the structural basis of Y4R ligand design for potential obesity therapeutics.