+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 7cum | ||||||
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タイトル | Cryo-EM structure of human GABA(B) receptor bound to the antagonist CGP54626 | ||||||
要素 |
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キーワード | SIGNALING PROTEIN / GPCR / GABA / Neurosignalling / MEMBRANE PROTEIN | ||||||
機能・相同性 | 機能・相同性情報 G protein-coupled neurotransmitter receptor activity involved in regulation of postsynaptic membrane potential / GABA B receptor activation / G protein-coupled neurotransmitter receptor activity involved in regulation of presynaptic membrane potential / G protein-coupled GABA receptor complex / negative regulation of gamma-aminobutyric acid secretion / neuron-glial cell signaling / G protein-coupled GABA receptor activity / G protein-coupled receptor heterodimeric complex / negative regulation of epinephrine secretion / negative regulation of dopamine secretion ...G protein-coupled neurotransmitter receptor activity involved in regulation of postsynaptic membrane potential / GABA B receptor activation / G protein-coupled neurotransmitter receptor activity involved in regulation of presynaptic membrane potential / G protein-coupled GABA receptor complex / negative regulation of gamma-aminobutyric acid secretion / neuron-glial cell signaling / G protein-coupled GABA receptor activity / G protein-coupled receptor heterodimeric complex / negative regulation of epinephrine secretion / negative regulation of dopamine secretion / positive regulation of growth hormone secretion / extracellular matrix protein binding / GABA receptor complex / negative regulation of adenylate cyclase activity / positive regulation of glutamate secretion / Class C/3 (Metabotropic glutamate/pheromone receptors) / synaptic transmission, GABAergic / gamma-aminobutyric acid signaling pathway / negative regulation of synaptic transmission / axolemma / GABA-ergic synapse / adenylate cyclase-inhibiting G protein-coupled receptor signaling pathway / dendritic shaft / response to nicotine / mitochondrial membrane / Schaffer collateral - CA1 synapse / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / osteoblast differentiation / transmembrane signaling receptor activity / synaptic vesicle / presynaptic membrane / G alpha (i) signalling events / chemical synaptic transmission / postsynaptic membrane / response to ethanol / dendritic spine / neuron projection / protein heterodimerization activity / G protein-coupled receptor signaling pathway / negative regulation of cell population proliferation / neuronal cell body / glutamatergic synapse / endoplasmic reticulum membrane / extracellular space / plasma membrane / cytoplasm 類似検索 - 分子機能 | ||||||
生物種 | Homo sapiens (ヒト) | ||||||
手法 | 電子顕微鏡法 / 単粒子再構成法 / クライオ電子顕微鏡法 / 解像度: 3.52 Å | ||||||
データ登録者 | Kim, Y. / Jeong, E. / Jeong, J. / Kim, Y. / Cho, Y. | ||||||
資金援助 | 韓国, 1件
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引用 | ジャーナル: J Mol Biol / 年: 2020 タイトル: Structural Basis for Activation of the Heterodimeric GABA Receptor. 著者: Yoojoong Kim / Eunyoung Jeong / Ji-Hong Jeong / Youngjin Kim / Yunje Cho / 要旨: The neurotransmitter γ-aminobutyric acid (GABA) activates the metabotropic GABA receptor to generate slow, prolonged inhibitory signals that regulate the neural circuitry. The GABA receptor is an ...The neurotransmitter γ-aminobutyric acid (GABA) activates the metabotropic GABA receptor to generate slow, prolonged inhibitory signals that regulate the neural circuitry. The GABA receptor is an obligate heterodimeric G protein-coupled receptor (GPCR) comprised of GBR1 and GBR2 subunits, each with extracellular, seven-helix transmembrane (7TM), and coiled-coil domains. To understand how GABA-driven conformational changes in the extracellular domain are transmitted to the 7TM domain during signal transduction, we determined cryo-electron microscopy (EM) structures of GABA in two different states: an antagonist-bound inactive state, and an active state in which both the GABA agonist and a positive allosteric modulator (PAM) are bound. In the inactive state, the TM3 and TM5 helices in the two 7TM domains engage in cholesterol-mediated as well as direct interactions, resulting in an open conformation. GABA binding forces the extracellular domains of GBR1 and GBR2 into a compact form, relocating the linkers that connect the extracellular and 7TM domains closer to each other. The movement of the linker along with the associated extracellular loop 2 of the 7TM domain reorients the two 7TM domains and creates a new interface with the TM5, TM6 and TM7 helices in a closed conformation. PAM binding to the interface between the TM6 and TM6 helices stabilizes the active 7TM domain conformation. The relayed structural rearrangement results in significant conformational changes in the TM helices, as well as intracellular loop 3 in GBR2, which may promote the binding and activation of the Gi/o proteins. | ||||||
履歴 |
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-構造の表示
ムービー |
ムービービューア |
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構造ビューア | 分子: MolmilJmol/JSmol |
-ダウンロードとリンク
-ダウンロード
PDBx/mmCIF形式 | 7cum.cif.gz | 487.7 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb7cum.ent.gz | 399.8 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 7cum.json.gz | ツリー表示 | PDBx/mmJSON形式 | |
その他 | その他のダウンロード |
-検証レポート
文書・要旨 | 7cum_validation.pdf.gz | 1.7 MB | 表示 | wwPDB検証レポート |
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文書・詳細版 | 7cum_full_validation.pdf.gz | 1.7 MB | 表示 | |
XML形式データ | 7cum_validation.xml.gz | 43.9 KB | 表示 | |
CIF形式データ | 7cum_validation.cif.gz | 65 KB | 表示 | |
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/cu/7cum ftp://data.pdbj.org/pub/pdb/validation_reports/cu/7cum | HTTPS FTP |
-関連構造データ
-リンク
-集合体
登録構造単位 |
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1 |
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-要素
#1: タンパク質 | 分子量: 87248.195 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: GABBR1, GPRC3A / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: Q9UBS5 | ||||||||
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#2: タンパク質 | 分子量: 92231.258 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 遺伝子: GABBR2, GPR51, GPRC3B / 発現宿主: Homo sapiens (ヒト) / 参照: UniProt: O75899 | ||||||||
#3: 化合物 | ChemComp-2BV / ( | ||||||||
#4: 化合物 | 分子量: 814.167 Da / 分子数: 2 / 由来タイプ: 合成 / タイプ: SUBJECT OF INVESTIGATION #5: 化合物 | ChemComp-CLR / 研究の焦点であるリガンドがあるか | Y | Has protein modification | Y | 非ポリマーの詳細 | The phospholipid-like ligands are similar to U3G and U3D respectively but not exactly same. Since ...The phospholipid-like ligands are similar to U3G and U3D respectively but not exactly same. Since they were not characterized due to the unknown part, they are assigned with UNL. | |
-実験情報
-実験
実験 | 手法: 電子顕微鏡法 |
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EM実験 | 試料の集合状態: PARTICLE / 3次元再構成法: 単粒子再構成法 |
-試料調製
構成要素 | 名称: Gamma-aminobutyric acid type B receptor / タイプ: COMPLEX 詳細: Antagonist-bound Gamma-aminobutyric acid type B receptor Entity ID: #1-#2 / 由来: RECOMBINANT |
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分子量 | 値: 200 kDa/nm / 実験値: YES |
由来(天然) | 生物種: Homo sapiens (ヒト) |
由来(組換発現) | 生物種: Homo sapiens (ヒト) |
緩衝液 | pH: 7.5 |
試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES |
試料支持 | グリッドの材料: COPPER / グリッドのサイズ: 400 divisions/in. / グリッドのタイプ: C-flat-1.2/1.3 |
急速凍結 | 凍結剤: ETHANE |
-電子顕微鏡撮影
実験機器 | モデル: Titan Krios / 画像提供: FEI Company | ||||||||||||
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顕微鏡 | モデル: FEI TITAN KRIOS | ||||||||||||
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: FLOOD BEAM | ||||||||||||
電子レンズ | モード: DIFFRACTION | ||||||||||||
撮影 |
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-解析
ソフトウェア | 名称: PHENIX / バージョン: 1.14_3260: / 分類: 精密化 | ||||||||||||||||||||||||
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CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3次元再構成 | 解像度: 3.52 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 512675 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
拘束条件 |
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