Chemistry/structural biology of psychedelic drugs and their receptor(s).

This brief review highlights some of the structure-activity relationships of classic serotonergic psychedelics. In particular, we discuss structural features of three chemotypes: phenethylamines, ergolines and certain tryptamines, which possess psychedelic activity in humans. Where they are known, we point out the underlying molecular mechanisms utilized by each of the three chemotypes of psychedelic molecules. With a focus on the 5-HT2A receptor subtype, a G-protein coupled receptor known to be the primary target of psychedelics, we refer to several X-ray and cryoEM structures, with a variety of ligands bound, to illustrate the underlying atomistic basis for some of the known pharmacological observations of psychedelic drug actions. LINKED ARTICLES: This article is part of a themed issue Emerging Therapeutic Opportunities for Psychedelic and Related Drugs. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v183.14/issuetoc.