Structure of the human smoothened receptor bound to an antitumour agent

Article

关键词: RESOLUTION CRYSTAL-STRUCTURE;    PROTEIN-COUPLED RECEPTOR;    OPIOID RECEPTOR;    INTERNATIONAL UNION;    LIPIDIC MESOPHASES;    FRIZZLED RECEPTORS;    MEMBRANE-PROTEINS;    HEDGEHOG;    ACTIVATION;    PATHWAY;   

DOI  :  10.1038/nature12167

来源: SCIE

【 摘 要 】

The smoothened (SMO) receptor, a key signal transducer in the hedgehog signalling pathway, is responsible for the maintenance of normal embryonic development and is implicated in carcinogenesis. It is classified as a class frizzled (class F) G-protein-coupled receptor (GPCR), although the canonical hedgehog signalling pathway involves the GLI transcription factors and the sequence similarity with class A GPCRs is less than 10%. Here we report the crystal structure of the transmembrane domain of the human SMO receptor bound to the small-molecule antagonist LY2940680 at 2.5 angstrom resolution. Although the SMO receptor shares the seven-transmembrane helical fold, most of the conserved motifs for class A GPCRs are absent, and the structure reveals an unusually complex arrangement of long extracellular loops stabilized by four disulphide bonds. The ligand binds at the extracellular end of the seven-transmembrane-helix bundle and forms extensive contacts with the loops.

【 授权许可】

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