Structure of the Human Smoothened Receptor Bound to an Antitumour Agent

Overview

Journal Nature

Specialty Science

Date 2013 May 3

PMID 23636324

Citations 211

Authors

Chong Wang

Huixian Wu

Vsevolod Katritch

Gye Won Han

Xi-Ping Huang

Wei Liu

Fai Yiu Siu

Bryan L Roth

Vadim Cherezov

Raymond C Stevens

Affiliations

Soon will be listed here.

Abstract

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 Å 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.

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