登録情報 データベース : EMDB  /  ID : EMD-22117タイトル Structure of human SMO-D384R complex with Gi Structure of human SMO-D384R complex with Gi  複合体 : SMO-GI COMPLEXタンパク質・ペプチド : Smoothened homologタンパク質・ペプチド : Guanine nucleotide-binding protein G(i) subunit alpha-1タンパク質・ペプチド : Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1タンパク質・ペプチド : Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2タンパク質・ペプチド : scFv16リガンド : CHOLESTEROL /  機能・相同性 分子機能 ドメイン・相同性 構成要素 
 /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /   /  生物種 Homo sapiens  (ヒト) /  Mus musculus  (ハツカネズミ)手法  /   /  解像度 : 3.88 Å Qi X  /  Long T ジャーナル : Nat Chem Biol  /  年 : 2020タイトル : Sterols in an intramolecular channel of Smoothened mediate Hedgehog signaling.著者 : Xiaofeng Qi  /  Lucas Friedberg  /  Ryan De Bose-Boyd  /  Tao Long  /  Xiaochun Li  /  要旨 : Smoothened (SMO), a class Frizzled G protein-coupled receptor (class F GPCR), transduces the Hedgehog signal across the cell membrane. Sterols can bind to its extracellular cysteine-rich domain  ... Smoothened (SMO), a class Frizzled G protein-coupled receptor (class F GPCR), transduces the Hedgehog signal across the cell membrane. Sterols can bind to its extracellular cysteine-rich domain (CRD) and to several sites in the seven transmembrane helices (7-TMs) of SMO. However, the mechanism by which sterols regulate SMO via multiple sites is unknown. Here we determined the structures of SMO-G complexes bound to the synthetic SMO agonist (SAG) and to 24(S),25-epoxycholesterol (24(S),25-EC). A novel sterol-binding site in the extracellular extension of TM6 was revealed to connect other sites in 7-TMs and CRD, forming an intramolecular sterol channel from the middle side of 7-TMs to CRD. Additional structures of two gain-of-function variants, SMO and SMO, showed that blocking the channel at its midpoints allows sterols to occupy the binding sites in 7-TMs, thereby activating SMO. These data indicate that sterol transport through the core of SMO is a major regulator of SMO-mediated signaling. 履歴 登録 2020年6月6日 - ヘッダ(付随情報) 公開 2020年9月30日 - マップ公開 2020年9月30日 - 更新 2024年10月23日 - 現状 2024年10月23日 処理サイト : RCSB /  状態 : 公開
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