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Pharmacophore and receptor models for neurokinin receptors

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Abstract

Three neurokinin (NK) antagonist pharmacophore models (Models 1–3) accounting for hydrogen bonding groups in the `head' and `tail' of NK receptor ligands have been developed by use of a new procedure for treatment of hydrogen bonds during superimposition. Instead of modelling the hydrogen bond acceptor vector in the strict direction of the lone pair, an angle is allowed between the hydrogen bond acceptor direction and the ideal lone pair direction. This approach adds flexibility to hydrogen bond directions and produces more realistic RMS values. By using this approach, two novel pharmacophore models were derived (Models 2 and 3) and a hydrogen bond acceptor was added to a previously published NK2 pharmacophore model [Poulsen et al., J. Comput.-Aided Mol. Design, 16 (2002) 273] (Model 1). Model 2 as well as Model 3 are described by seven pharmacophore elements: three hydrophobic groups, three hydrogen bond acceptors and a hydrogen bond donor. Model 1 contains the same hydrophobic groups and hydrogen bond donor as Models 2 and 3, but only one hydrogen bond acceptor. The hydrogen bond acceptors and donor are represented as vectors. Two of the hydrophobic groups are always aromatic rings whereas the other hydrophobic group can be either aromatic or aliphatic. In Model 1 the antagonists bind in an extended conformation with two aromatic rings in a parallel displaced and tilted conformation. Model 2 has the same two aromatic rings in a parallel displaced conformation whereas Model 3 has the rings in an edge to face conformation. The pharmacophore models were evaluated using both a structure (NK receptor homology models) and a ligand based approach. By use of exhaustive conformational analysis (MMFFs force field and the GB/SA hydration model) and least-squares molecular superimposition studies, 21 non-peptide antagonists from several structurally diverse classes were fitted to the pharmacophore models. More antagonists could be fitted to Model 2 with a low RMS and a low conformational energy penalty than to Models 1 and 3. Pharmacophore Model 2 was also able to explain the NK1, NK2 and NK3 subtype selectivity of the compounds fitted to the model. Three NK 7TM receptor models were constructed, one for each receptor subtype. The location of the antagonist binding site in the three NK receptor models is identical. Compounds fitted to pharmacophore Model 2 could be docked into the NK1, NK2 and NK3 receptor models after adjustment of the conformation of the flexible linker connecting the head and tail. Models 1 and 3 are not compatible with the receptor models.

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Authors and Affiliations

  1. Department of Medicinal Chemistry, The Danish University of Pharmaceutical Sciences, 2 Universitetsparken, DK-2100, Copenhagen, Denmark

    Anders Poulsen & Tommy Liljefors

  2. H. Lundbeck A/S, 9 Ottiliavej, DK-2500, Copenhagen-Valby, Denmark

    Anders Poulsen, Berith Bjørnholm & Klaus Gundertofte

  3. College of Pharmacy, University of Michigan, Ann Arbor, MI, 48109, USA

    Irina D. Pogozheva

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  1. Anders Poulsen
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  5. Tommy Liljefors
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Poulsen, A., Bjørnholm, B., Gundertofte, K. et al. Pharmacophore and receptor models for neurokinin receptors. J Comput Aided Mol Des 17, 765–783 (2003). https://doi.org/10.1023/B:JCAM.0000017497.58165.d8

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