National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
1R01GM108921
米国
American Heart Association
17POST33671152
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
3R01GM108921-03S1
米国
引用
ジャーナル: Nat Commun / 年: 2019 タイトル: Molecular mechanism of setron-mediated inhibition of full-length 5-HT receptor. 著者: Sandip Basak / Yvonne Gicheru / Abhijeet Kapoor / Megan L Mayer / Marta Filizola / Sudha Chakrapani / 要旨: Serotonin receptor (5-HTR) is the most common therapeutic target to manage the nausea and vomiting during cancer therapies and in the treatment of irritable bowel syndrome. Setrons, a class of ...Serotonin receptor (5-HTR) is the most common therapeutic target to manage the nausea and vomiting during cancer therapies and in the treatment of irritable bowel syndrome. Setrons, a class of competitive antagonists, cause functional inhibition of 5-HTR in the gastrointestinal tract and brainstem, acting as effective anti-emetic agents. Despite their prevalent use, the molecular mechanisms underlying setron binding and inhibition of 5-HTR are not fully understood. Here, we present the structure of granisetron-bound full-length 5-HTR solved by single-particle cryo-electron microscopy to 2.92 Å resolution. The reconstruction reveals the orientation of granisetron in the orthosteric site with unambiguous density for interacting sidechains. Molecular dynamics simulations and electrophysiology confirm the granisetron binding orientation and the residues central for ligand recognition. Comparison of granisetron-bound 5-HTR with the apo and serotonin-bound structures, reveals key insights into the mechanism underlying 5-HTR inhibition.