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データを開く
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基本情報
| 登録情報 | データベース: PDB / ID: 9jco | ||||||
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| タイトル | Cryo-EM structure of the proton-sensing GPCR (GPR4)-Gs protein complex at pH 6.5 | ||||||
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キーワード | SIGNALING PROTEIN / Cryo-EM / GPCR / proton-sensing / GPR4 / pH 6.5 / Gs / complex | ||||||
| 機能・相同性 | 機能・相同性情報glomerular mesangial cell development / regulation of vascular permeability / response to acidic pH / Class A/1 (Rhodopsin-like receptors) / angiogenesis involved in wound healing / positive regulation of Rho protein signal transduction / regulation of cell adhesion / negative regulation of angiogenesis / G protein-coupled receptor activity / Olfactory Signaling Pathway ...glomerular mesangial cell development / regulation of vascular permeability / response to acidic pH / Class A/1 (Rhodopsin-like receptors) / angiogenesis involved in wound healing / positive regulation of Rho protein signal transduction / regulation of cell adhesion / negative regulation of angiogenesis / G protein-coupled receptor activity / Olfactory Signaling Pathway / Activation of the phototransduction cascade / adenylate cyclase-activating G protein-coupled receptor signaling pathway / G beta:gamma signalling through PLC beta / Presynaptic function of Kainate receptors / Thromboxane signalling through TP receptor / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G-protein activation / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through CDC42 / Glucagon signaling in metabolic regulation / positive regulation of inflammatory response / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / ADP signalling through P2Y purinoceptor 12 / photoreceptor disc membrane / Sensory perception of sweet, bitter, and umami (glutamate) taste / Glucagon-type ligand receptors / Adrenaline,noradrenaline inhibits insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / G alpha (z) signalling events / cellular response to catecholamine stimulus / ADORA2B mediated anti-inflammatory cytokines production / ADP signalling through P2Y purinoceptor 1 / G beta:gamma signalling through PI3Kgamma / adenylate cyclase-activating dopamine receptor signaling pathway / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / Inactivation, recovery and regulation of the phototransduction cascade / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / G alpha (12/13) signalling events / sensory perception of taste / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / retina development in camera-type eye / GTPase binding / Ca2+ pathway / fibroblast proliferation / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / G alpha (i) signalling events / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / G alpha (q) signalling events / Ras protein signal transduction / Extra-nuclear estrogen signaling / cell population proliferation / G protein-coupled receptor signaling pathway / lysosomal membrane / GTPase activity / synapse / protein-containing complex binding / signal transduction / extracellular exosome / membrane / plasma membrane / cytoplasm / cytosol 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: 2.36 Å | ||||||
データ登録者 | You, C. / Xu, H.E. / Jiang, Y. | ||||||
| 資金援助 | 中国, 1件
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引用 | ジャーナル: Cell Discov / 年: 2025タイトル: Molecular mechanism of pH sensing and activation in GPR4 reveals proton-mediated GPCR signaling. 著者: Chongzhao You / Shimeng Guo / Tianwei Zhang / Xinheng He / Tianyu Gao / Wenwen Xin / Zining Zhu / Yujie Lu / Youwei Xu / Zhen Li / Yumu Zhang / Xi Cheng / Yi Jiang / Xin Xie / H Eric Xu / ![]() 要旨: Maintaining pH homeostasis is critical for cellular function across all living organisms. Proton-sensing G protein-coupled receptors (GPCRs), particularly GPR4, play a pivotal role in cellular ...Maintaining pH homeostasis is critical for cellular function across all living organisms. Proton-sensing G protein-coupled receptors (GPCRs), particularly GPR4, play a pivotal role in cellular responses to pH changes. Yet, the molecular mechanisms underlying their proton sensing and activation remain incompletely understood. Here we present high-resolution cryo-electron microscopy structures of GPR4 in complex with G proteins under physiological and acidic pH conditions. Our structures reveal an intricate proton-sensing mechanism driven by a sophisticated histidine network in the receptor's extracellular domain. Upon protonation of key histidines under acidic conditions, a remarkable conformational cascade is initiated, propagating from the extracellular region to the intracellular G protein-coupling interface. This dynamic process involves precise transmembrane helix rearrangements and conformational shifts of conserved motifs, mediated by strategically positioned water molecules. Notably, we discovered a bound bioactive lipid, lysophosphatidylcholine, which has positive allosteric effects on GPR4 activation. These findings provide a comprehensive framework for understanding proton sensing in GPCRs and the interplay between pH sensing and lipid regulation, offering insights into cellular pH homeostasis and potential therapies for pH-related disorders. | ||||||
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構造の表示
| 構造ビューア | 分子: Molmil Jmol/JSmol |
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ダウンロードとリンク
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ダウンロード
| PDBx/mmCIF形式 | 9jco.cif.gz | 413.6 KB | 表示 | PDBx/mmCIF形式 |
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| PDB形式 | pdb9jco.ent.gz | 表示 | PDB形式 | |
| PDBx/mmJSON形式 | 9jco.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/jc/9jco ftp://data.pdbj.org/pub/pdb/validation_reports/jc/9jco | HTTPS FTP |
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-関連構造データ
| 関連構造データ | ![]() 61370MC ![]() 9jcpC ![]() 9jcqC M: このデータのモデリングに利用したマップデータ C: 同じ文献を引用 ( |
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| 類似構造データ | 類似検索 - 機能・相同性 F&H 検索 |
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リンク
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集合体
| 登録構造単位 | ![]()
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要素
-Guanine nucleotide-binding protein ... , 3種, 3分子 ABG
| #1: タンパク質 | 分子量: 41879.465 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) Homo sapiens (ヒト) / 発現宿主: Trichoplusia ni (イラクサキンウワバ) |
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| #2: タンパク質 | 分子量: 56515.297 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: GNB1 / 発現宿主: Trichoplusia ni (イラクサキンウワバ) / 参照: UniProt: P62873 |
| #3: タンパク質 | 分子量: 7729.947 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: GNG2 / 発現宿主: Trichoplusia ni (イラクサキンウワバ) / 参照: UniProt: P59768 |
-抗体 / タンパク質 , 2種, 2分子 NR
| #4: 抗体 | 分子量: 13885.439 Da / 分子数: 1 / 由来タイプ: 組換発現 / 由来: (組換発現) ![]() ![]() |
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| #5: タンパク質 | 分子量: 41026.664 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: GPR4 / 発現宿主: Trichoplusia ni (イラクサキンウワバ) / 参照: UniProt: P46093 |
-非ポリマー , 3種, 9分子 


| #6: 化合物 | | #7: 化合物 | 分子量: 300.266 Da / 分子数: 2 / 由来タイプ: 合成 / 式: C10H23NO7P / タイプ: SUBJECT OF INVESTIGATION #8: 水 | ChemComp-HOH / | |
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-詳細
| 研究の焦点であるリガンドがあるか | Y |
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| Has protein modification | Y |
-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 |
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試料調製
| 構成要素 | 名称: Cryo-EM structure of the proton-sensing GPCR (GPR4)-Gs protein complex at pH 6.5 タイプ: COMPLEX / Entity ID: #1-#5 / 由来: RECOMBINANT | ||||||||||||
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| 由来(天然) |
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| 由来(組換発現) |
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| 緩衝液 | pH: 6.5 | ||||||||||||
| 試料 | 包埋: NO / シャドウイング: NO / 染色: NO / 凍結: YES | ||||||||||||
| 急速凍結 | 凍結剤: ETHANE |
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電子顕微鏡撮影
| 実験機器 | ![]() モデル: Talos Arctica / 画像提供: FEI Company |
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| 顕微鏡 | モデル: FEI TALOS ARCTICA |
| 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: BRIGHT FIELD / 最大 デフォーカス(公称値): 20000 nm / 最小 デフォーカス(公称値): 5000 nm |
| 撮影 | 電子線照射量: 50 e/Å2 フィルム・検出器のモデル: FEI FALCON IV (4k x 4k) |
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解析
| CTF補正 | タイプ: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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| 3次元再構成 | 解像度: 2.36 Å / 解像度の算出法: FSC 0.143 CUT-OFF / 粒子像の数: 596409 / 対称性のタイプ: POINT | ||||||||||||||||||||||||
| 精密化 | 最高解像度: 2.36 Å 立体化学のターゲット値: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS) | ||||||||||||||||||||||||
| 拘束条件 |
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コントローラー
万見について




Homo sapiens (ヒト)

中国, 1件
引用




PDBj


























Trichoplusia ni (イラクサキンウワバ)

FIELD EMISSION GUN