Half-Life Extending Modifications of Peptide YY3-36 Direct Receptor-Mediated Internalization.
Mol Pharm. 2019 Jul 16;:
Authors: Bech EM, Kaiser A, Bellmann-Sickert K, Nielsen SS, Sørensen KK, Elster L, Hatzakis N, Pedersen SL, Beck-Sickinger AG, Jensen KJ
Peptide YY3-36 (PYY3-36) is an endogenous ligand of the neuropeptide Y2 receptor (Y2R), on which it acts to reduce food intake. Chemically modified PYY3-36 analogs with extended half-lives are potential therapeutics for the treatment of obesity. Here we show that the common half-life extending strategies PEGylation and lipidation not only control PYY3-36’s pharmacokinetics but also affects central aspects of its pharmacodynamics. PEGylation of PYY3-36 inhibited endocytosis by increasing receptor dissociation rates (koff), which reduced arrestin-3 (Arr3) activity. This is the first link between Arr3 recruitment and Y2R residence time. C16-lipidation of PYY3-36 had negligible impact on Y2R signaling, binding, and endocytosis. In contrast, C18acid-lipidation minimized endocytosis, which indicated a decreased internalization through non-arrestin-related mechanisms. We propose a temporal model that connects properties and position of the half-life extender with receptor Gi versus Arr3 signaling bias. We believe that this will be important for future design of peptide therapeutics.
PMID: 31310716 [PubMed – as supplied by publisher]