TY  - JOUR
AU  - Stauch, Benjamin
AU  - Johansson, Linda C.
AU  - McCorvy, John D.
AU  - Patel, Nilkanth
AU  - Han, Gye Won
AU  - Huang, Xi-Ping
AU  - Gati, Cornelius
AU  - Batyuk, Alexander
AU  - Slocum, Samuel T.
AU  - Ishchenko, Andrii
AU  - Brehm, Wolfgang
AU  - White, Thomas A.
AU  - Michaelian, Nairie
AU  - Madsen, Caleb
AU  - Zhu, Lan
AU  - Grant, Thomas D.
AU  - Grandner, Jessica M.
AU  - Shiriaeva, Anna
AU  - Olsen, Reid H. J.
AU  - Tribo, Alexandra R.
AU  - Yous, Saïd
AU  - Stevens, Raymond C.
AU  - Weierstall, Uwe
AU  - Katritch, Vsevolod
AU  - Roth, Bryan L.
AU  - Liu, Wei
AU  - Cherezov, Vadim
TI  - Structural basis of ligand recognition at the human MT1 melatonin receptor
JO  - Nature  / Physical science
VL  - 569
IS  - 7755
SN  - 1476-4687
CY  - London
PB  - Macmillan28177
M1  - PUBDB-2019-05027
SP  - 284 - 288
PY  - 2019
N1  - © Springer Nature Limited; Embargo 12 months from publication; Waiting for fulltext
AB  - Melatonin (N-acetyl-5-methoxytryptamine) is a neurohormone that maintains circadian rhythms by synchronization to environmental cues and is involved in diverse physiological processes such as the regulation of blood pressure and core body temperature, oncogenesis, and immune function. Melatonin is formed in the pineal gland in a light-regulated manner by enzymatic conversion from 5-hydroxytryptamine (5-HT or serotonin), and modulates sleep and wakefulness by activating two high-affinity G-protein-coupled receptors, type 1A (MT<sub>1</sub>) and type 1B (MT<sub>2</sub>). Shift work, travel, and ubiquitous artificial lighting can disrupt natural circadian rhythms; as a result, sleep disorders affect a substantial population in modern society and pose a considerable economic burden. Over-the-counter melatonin is widely used to alleviate jet lag and as a safer alternative to benzodiazepines and other sleeping aids, and is one of the most popular supplements in the United States. Here, we present high-resolution room-temperature X-ray free electron laser (XFEL) structures of MT<sub>1</sub> in complex with four agonists: the insomnia drug ramelteon, two melatonin analogues, and the mixed melatonin–serotonin antidepressant agomelatine. The structure of MT<sub>2</sub> is described in an accompanying paper. Although the MT<sub>1</sub> and 5-HT receptors have similar endogenous ligands, and agomelatine acts on both receptors, the receptors differ markedly in the structure and composition of their ligand pockets; in MT<sub>1</sub>, access to the ligand pocket is tightly sealed from solvent by extracellular loop 2, leaving only a narrow channel between transmembrane helices IV and V that connects it to the lipid bilayer. The binding site is extremely compact, and ligands interact with MT<sub>1</sub> mainly by strong aromatic stacking with Phe179 and auxiliary hydrogen bonds with Asn162 and Gln181. Our structures provide an unexpected example of atypical ligand entry for a non-lipid receptor, lay the molecular foundation of ligand recognition by melatonin receptors, and will facilitate the design of future tool compounds and therapeutic agents, while their comparison to 5-HT receptors yields insights into the evolution and polypharmacology of G-protein-coupled receptors. 
LB  - PUB:(DE-HGF)16
C6  - pmid:31019306
UR  - <Go to ISI:>//WOS:000467473600054
DO  - DOI:10.1038/s41586-019-1141-3
UR  - https://bib-pubdb1.desy.de/record/429424
ER  -