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• W1978022170 endingPage "300" @default.
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• W1978022170 abstract "The members of the neuropeptide Y (NPY) family are key players in food-intake regulation. In humans this family consists of NPY, peptide YY (PYY) and pancreatic polypeptide (PP) which interact with distinct preference for the four receptors showing very low sequence identity, i.e. Y1, Y2, Y4 and Y5. The binding of similar peptides to these divergent receptors makes them highly interesting for mutagenesis studies. We present here a site-directed mutagenesis study of four amino acid positions in the human Y2 receptor. T(3.40) was selected based on sequence alignments both between subtypes and between species and G(2.68), L(4.60) and Q(6.55) also on previous binding studies of the corresponding positions in the Y1 receptor. The mutated receptors were characterized pharmacologically with the peptide agonists NPY, PYY, PYY(3-36), NPY(13-36) and the non-peptide antagonist BIIE0246. Interestingly, the affinity of NPY and PYY(3-36) increased for the mutants T(3.40)I and Q(6.55)A. Increased affinity was also observed for PYY to Q(6.55)A. PYY(3-36) displayed decreased affinity for G(2.68)N and L(4.60)A whereas binding of NPY(13-36) was unaffected by all mutations. The antagonist BIIE0246 showed decreased affinity for T(3.40)I, L(4.60)A and Q(6.55)A. Although all positions investigated were found important for interaction with at least one of the tested ligands the corresponding positions in hY1 seem to be of greater importance for ligand binding. Furthermore these data indicate that binding of the agonists and the antagonist differs in their points of interaction. The increase in the binding affinity observed may reflect an indirect effect caused by a conformational change of the receptor. These findings will help to improve the structural models of the human NPY receptors." @default.
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• W1978022170 date "2011-08-01" @default.
• W1978022170 modified "2023-10-16" @default.
• W1978022170 title "Identification of positions in the human neuropeptide Y/peptide YY receptor Y2 that contribute to pharmacological differences between receptor subtypes" @default.
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• W1978022170 doi "https://doi.org/10.1016/j.npep.2011.05.006" @default.
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