Egyed, AttilaKelemen, Ádám A.Vass, MártonVisegrády, AndrásThee, Stephanie A.Wang, ZhiyongGraaf, Chris deBrea Floriani, José ManuelLoza García, María IsabelLeurs, RobKeserű, György M.2026-01-212026-01-212021-03-19Egyed, A., Kelemen, Á A., Vass, M., Visegrády, A., Thee, S. A., Wang, Z., . . . Keserű, G. M. (2021). Controlling the selectivity of aminergic GPCR ligands from the extracellular vestibule. Bioorganic Chemistry, 111, 104832. doi:10.1016/j.bioorg.2021.1048320045-2068https://hdl.handle.net/10347/45313In addition to the orthosteric binding pocket (OBP) of GPCRs, recent structural studies have revealed that there are several allosteric sites available for pharmacological intervention. The secondary binding pocket (SBP) of aminergic GPCRs is located in the extracellular vestibule of these receptors, and it has been suggested to be a potential selectivity pocket for bitopic ligands. Here, we applied a virtual screening protocol based on fragment docking to the SBP of the orthosteric ligand-receptor complex. This strategy was employed for a number of aminergic receptors. First, we designed dopamine D3 preferring bitopic compounds from a D2 selective orthosteric ligand. Next, we designed 5-HT2B selective bitopic compounds starting from the 5-HT1B preferring ergoline core of LSD. Comparing the serotonergic profiles of the new derivatives to that of LSD, we found that these derivatives became significantly biased towards the desired 5-HT2B receptor target. Finally, addressing the known limitations of H1 antihistamines, our protocol was successfully used to eliminate the well-known side effects related to the muscarinic M1 activity of amitriptyline while preserving H1 potency in some of the designed bitopic compounds. These applications highlight the usefulness of our new virtual screening protocol and offer a powerful strategy towards bitopic GPCR ligands with designed receptor profiles.eng© 2021 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/)Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/GPCRSelectivityBitopic ligandSecondary binding pocketFragment linking2306 Química orgánicajournal article10.1016/j.bioorg.2021.104832open access