+データを開く
-基本情報
登録情報 | データベース: PDB / ID: 6w2x | |||||||||
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タイトル | CryoEM Structure of Inactive GABAB Heterodimer | |||||||||
要素 | (Gamma-aminobutyric acid type B receptor subunit ...) x 2 | |||||||||
キーワード | SIGNALING PROTEIN / Inhibitor / Heterodimer / GPCR | |||||||||
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: 3.6 Å | |||||||||
データ登録者 | Papasergi-Scott, M.M. / Robertson, M.J. / Skiniotis, G. | |||||||||
資金援助 | 米国, 1件
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引用 | ジャーナル: Nature / 年: 2020 タイトル: Structures of metabotropic GABA receptor. 著者: Makaía M Papasergi-Scott / Michael J Robertson / Alpay B Seven / Ouliana Panova / Jesper M Mathiesen / Georgios Skiniotis / 要旨: Stimulation of the metabotropic GABA receptor by γ-aminobutyric acid (GABA) results in prolonged inhibition of neurotransmission, which is central to brain physiology. GABA belongs to family C of ...Stimulation of the metabotropic GABA receptor by γ-aminobutyric acid (GABA) results in prolonged inhibition of neurotransmission, which is central to brain physiology. GABA belongs to family C of the G-protein-coupled receptors, which operate as dimers to transform synaptic neurotransmitter signals into a cellular response through the binding and activation of heterotrimeric G proteins. However, GABA is unique in its function as an obligate heterodimer in which agonist binding and G-protein activation take place on distinct subunits. Here we present cryo-electron microscopy structures of heterodimeric and homodimeric full-length GABA receptors. Complemented by cellular signalling assays and atomistic simulations, these structures reveal that extracellular loop 2 (ECL2) of GABA has an essential role in relaying structural transitions by ordering the linker that connects the extracellular ligand-binding domain to the transmembrane region. Furthermore, the ECL2 of each of the subunits of GABA caps and interacts with the hydrophilic head of a phospholipid that occupies the extracellular half of the transmembrane domain, thereby providing a potentially crucial link between ligand binding and the receptor core that engages G proteins. These results provide a starting framework through which to decipher the mechanistic modes of signal transduction mediated by GABA dimers, and have important implications for rational drug design that targets these receptors. | |||||||||
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 | 6w2x.cif.gz | 245.8 KB | 表示 | PDBx/mmCIF形式 |
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PDB形式 | pdb6w2x.ent.gz | 189.9 KB | 表示 | PDB形式 |
PDBx/mmJSON形式 | 6w2x.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
アーカイブディレクトリ | https://data.pdbj.org/pub/pdb/validation_reports/w2/6w2x ftp://data.pdbj.org/pub/pdb/validation_reports/w2/6w2x | HTTPS FTP |
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-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
-Gamma-aminobutyric acid type B receptor subunit ... , 2種, 2分子 AB
#1: タンパク質 | 分子量: 94173.570 Da / 分子数: 1 / 断片: UNP residues 30-844 / 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: Spodoptera frugiperda (ツマジロクサヨトウ) 参照: UniProt: Q9UBS5 |
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#2: タンパク質 | 分子量: 102799.164 Da / 分子数: 1 / 断片: UNP residues 42-941 / 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: Spodoptera frugiperda (ツマジロクサヨトウ) 参照: UniProt: O75899 |
-糖 , 2種, 4分子
#3: 多糖 | #4: 糖 | |
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-非ポリマー , 3種, 4分子
#5: 化合物 | #6: 化合物 | ChemComp-SGG / [( | #7: 化合物 | ChemComp-MG / | |
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-詳細
研究の焦点であるリガンドがあるか | N |
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-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: GABAB Heterodimer / タイプ: COMPLEX / Entity ID: #1-#2 / 由来: RECOMBINANT | |||||||||||||||||||||||||
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分子量 | 実験値: NO | |||||||||||||||||||||||||
由来(天然) | 生物種: Homo sapiens (ヒト) | |||||||||||||||||||||||||
由来(組換発現) | 生物種: Spodoptera frugiperda (ツマジロクサヨトウ) | |||||||||||||||||||||||||
緩衝液 | pH: 7.5 | |||||||||||||||||||||||||
緩衝液成分 |
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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: GOLD / グリッドのタイプ: Quantifoil R1.2/1.3 | |||||||||||||||||||||||||
急速凍結 | 装置: FEI VITROBOT MARK IV / 凍結剤: ETHANE / 湿度: 100 % / 凍結前の試料温度: 291 K |
-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: TFS KRIOS |
電子銃 | 電子線源: FIELD EMISSION GUN / 加速電圧: 300 kV / 照射モード: OTHER |
電子レンズ | モード: BRIGHT FIELD |
撮影 | 平均露光時間: 3.5 sec. / 電子線照射量: 60.5 e/Å2 / フィルム・検出器のモデル: GATAN K3 (6k x 4k) |
-解析
EMソフトウェア |
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CTF補正 | タイプ: NONE | ||||||||||||||||||||||||||||||||||||
粒子像の選択 | 選択した粒子像数: 2601040 | ||||||||||||||||||||||||||||||||||||
対称性 | 点対称性: C1 (非対称) | ||||||||||||||||||||||||||||||||||||
3次元再構成 | 解像度: 3.6 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 286140 / 対称性のタイプ: POINT |