Agonists for 13 trace amine-associated receptors provide insight into the molecular basis of odor selectivity.

Agonists for 13 trace amine-associated receptors provide insight into the molecular basis of odor selectivity.
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DOI:
10.1021/cb300111e
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发表时间:
2012-07-20
影响因子:
4
通讯作者:
Liberles, Stephen D.
Liberles, Stephen D.
中科院分区:
生物学2区
文献类型:
--
作者:
Ferrero, David M.;Wacker, Daniel;Roque, Miguel A.;Baldwin, Maude W.;Stevens, Raymond C.;Liberles, Stephen D.

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Trace amine-associated receptors (TAARs) are vertebrate olfactory receptors. However, ligand recognition properties of TAARs remain poorly understood, as most are ‘orphan receptors’ without known agonists. Here, we identify the first ligands for many rodent TAARs, and classify these receptors into two subfamilies based on phylogeny and binding preference for primary or tertiary amines. Some mouse and rat orthologs have similar response profiles, although independent Taar7 gene expansions led to highly related receptors with altered ligand specificities. Using chimeric TAAR7 receptors, we identified an odor contact site in transmembrane helix III that functions as a selectivity filter. Homology models based on the β2 adrenergic receptor structure indicate close proximity of this site to the ligand. Gain-of-function mutations at this site created olfactory receptors with radically altered odor recognition properties. These studies provide new TAAR ligands, valuable tools to study receptor function, and general insights into the molecular pharmacology of GPCRs.
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