登録情報 データベース : EMDB  /  ID : EMD-47953タイトル Cryo-EM structure of the adenosine A2A receptor intermediate bound to a miniGs heterotrimer Raw Map  複合体 : Cryo-EM structure of the GPCR bound to a miniGs heterotrimerタンパク質・ペプチド : Adenosine receptor A2a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 : Guanine nucleotide-binding protein G(s) subunit alpha isoforms shortタンパク質・ペプチド : nanobody Nb35リガンド : ADENOSINE /   /   /   /  機能・相同性 分子機能 ドメイン・相同性 構成要素 
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 ジャーナル : Nat Commun  /  年 : 2025タイトル : Structure and function of a near fully-activated intermediate GPCR-Gαβγ complex.著者 : Maxine Bi  /  Xudong Wang  /  Jinan Wang  /  Jun Xu  /  Wenkai Sun  /  Victor Ayo Adediwura  /  Yinglong Miao  /  Yifan Cheng  /  Libin Ye  /  要旨 : Unraveling the signaling roles of intermediate complexes is pivotal for G protein-coupled receptor (GPCR) drug development. Despite hundreds of GPCR-Gαβγ structures, these snapshots primarily  ... Unraveling the signaling roles of intermediate complexes is pivotal for G protein-coupled receptor (GPCR) drug development. Despite hundreds of GPCR-Gαβγ structures, these snapshots primarily capture the fully activated complex. Consequently, the functions of intermediate GPCR-G protein complexes remain elusive. Guided by a conformational landscape visualized via F quantitative NMR and molecular dynamics (MD) simulations, we determined the structure of an intermediate GPCR-mini-Gαβγ complex at 2.6 Å using cryo-EM, by blocking its transition to the fully activated complex. Furthermore, we present direct evidence that the complex at this intermediate state initiates a rate-limited nucleotide exchange before transitioning to the fully activated complex. In this state, BODIPY-GDP/GTP based nucleotide exchange assays further indicated the α-helical domain of the Gα is partially open, allowing it to grasp a nucleotide at a non-canonical binding site, distinct from the canonical nucleotide-binding site. These advances bridge a significant gap in our understanding of the complexity of GPCR signaling. 履歴 登録 2024年11月18日 - ヘッダ(付随情報) 公開 2025年4月9日 - マップ公開 2025年4月9日 - 更新 2025年8月13日 - 現状 2025年8月13日 処理サイト : RCSB /  状態 : 公開
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