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Biased agonists at the human Y1 receptor lead to prolonged membrane residency and extended receptor G protein interaction

Abstract

Functionally selective ligands to address specific cellular responses downstream of G protein-coupled receptors (GPCR) open up new possibilities for therapeutics. We designed and characterized novel subtype- and pathway-selective ligands. Substitution of position Q34 of neuropeptide Y to glycine (G34-NPY) results in unprecedented selectivity over all other YR subtypes. Moreover, this ligand displays a significant bias towards activation of the Gi/o pathway over recruitment of arrestin-3. Notably, no bias is observed for an established Y1R versus Y2R selective ligand carrying a proline at position 34 (F7,P34-NPY). Next, we investigated the spatio-temporal signaling at the Y1R and demonstrated that G protein-biased ligands promote a prolonged localization at the cell membrane, which leads to enhanced G protein signaling, while endosomal receptors do not contribute to cAMP signaling. Thus, spatial components are critical for the signaling of the Y1R that can be modulated by tailored ligands and represent a novel mode for biased pathways.

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Fig. 1

modified from Yang et al. [21]. Positions 7, 18 and 34 used for modification are highlighted in circles. c Binding of peptides to the Y1R was measured by competition binding experiments with 125I-PYY (75 pM) of membrane preparations of stably transfected HEK293-Y1R cells and is displayed as mean ± SEM of three independent experiments performed in technical triplicate

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Acknowledgements

The authors thank Prof. Dr. D. Huster for fruitful discussions on the binding mode and conformational freedom of NPY when bound to its receptors, which further motivated exploration of ligand position 34. Moreover, they would like to thank Dr. K. Bellmann-Sickert for help with synthesis of the PEGylated peptide. The authors gratefully acknowledge the expert technical assistance of C. Dammann, K. Löbner, R. Müller, R. Reppich-Sacher and J. Schwesinger.

Funding

This work was supported by the German Science Foundation project number 209933838, SFB1052 TP A3 to A. G. B.-S., project number 421152132, SFB 1423 TP B1 to A. G. B.-S. and B3 to A. K., the European Union, the Federal State of Saxony (SMWK, grant 100316655 to A.K.) and the “European Regional Development Fund”.

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Correspondence to Annette G. Beck-Sickinger.

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Kaiser, A., Wanka, L., Ziffert, I. et al. Biased agonists at the human Y1 receptor lead to prolonged membrane residency and extended receptor G protein interaction. Cell. Mol. Life Sci. (2020) doi:10.1007/s00018-019-03432-7

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Keywords

  • GPCR
  • NPY
  • Signaling bias
  • Arrestin
  • G Protein