Delineation of Receptor‐Ligand Interactions at the Human Histamine H1 Receptor by a Combined Approach of Site‐Directed Mutagenesis and Computational Techniques – or – How to Bind the H1 Receptor

Histamine H(1) antagonists or "antihistamines" are one of the most prescribed drug families in Western countries. They exert their effect by binding to the histamine H(1) receptor, a receptor belonging to the class of rhodopsin-like G protein-coupled receptors (GPCRs). In this review, the binding of ligands to the human histamine H(1) receptor with respect to site-directed mutagenesis studies and molecular modeling techniques is described. The ligands described include agonists (histamine and histaprodifens), a stereoselective partial agonist (lisuride), and selected inverse agonists (mepyramine, acrivastine and triprolidine).