Amino Acid Hot Spots of Halogen Bonding: A Combined Theoretical and Experimental Case Study of the 5-HT<sub>7</sub> Receptor
作者:Rafał Kurczab、Vittorio Canale、Grzegorz Satała、Paweł Zajdel、Andrzej J. Bojarski
DOI:10.1021/acs.jmedchem.8b00828
日期:2018.10.11
A computational approach combining a structure-activity relationship library of halogenated and the corresponding unsubstituted ligands (called XSAR) with QM-based molecular docking and binding free energy calculations was used to search for amino acids frequently targeted by halogen bonding (hot spots) in a 5-HT7R as a case study. The procedure identified two sets of hot spots, extracellular (D2.65, T2.64, and E7.35) and transmembrane (C3.36, TS.39, and S5.42), which were further verified by a synthesized library of halogenated arylsulfonamide derivatives of (aryloxy)ethylpiperidines. It was found that a halogen bond formed between T5.39 and a bromine atom at 3-position of the aryloxy fragment caused the most remarkable, 35-fold increase in binding affinity for 5-HT7R when compared to the nonhalogenated analog. The proposed paradigm of halogen bonding hot spots was additionally verified on D-4 dopamine receptor showing that it can be used in rational drug design/optimization for any protein target.