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Open data
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Basic information
Entry | Database: PDB / ID: 7xjl | ||||||
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Title | Cryo-EM structure of the spexin-bound GALR2-miniGq complex | ||||||
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![]() | SIGNALING PROTEIN / GPCR / galanin receptor 2 / miniGq / spexin | ||||||
Function / homology | ![]() galanin-activated signaling pathway / galanin receptor activity / positive regulation of large conductance calcium-activated potassium channel activity / inositol phosphate metabolic process / phosphatidylinositol metabolic process / neuropeptide binding / feeding behavior / peptide hormone binding / neuropeptide signaling pathway / Peptide ligand-binding receptors ...galanin-activated signaling pathway / galanin receptor activity / positive regulation of large conductance calcium-activated potassium channel activity / inositol phosphate metabolic process / phosphatidylinositol metabolic process / neuropeptide binding / feeding behavior / peptide hormone binding / neuropeptide signaling pathway / Peptide ligand-binding receptors / muscle contraction / Olfactory Signaling Pathway / Activation of the phototransduction cascade / adenylate cyclase-modulating 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 activation / adenylate cyclase-activating G protein-coupled receptor signaling pathway / G protein-coupled acetylcholine receptor signaling pathway / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Prostacyclin signalling through prostacyclin receptor / Glucagon signaling in metabolic regulation / G beta:gamma signalling through CDC42 / ADP signalling through P2Y purinoceptor 12 / G beta:gamma signalling through BTK / Synthesis, secretion, and inactivation of Glucagon-like Peptide-1 (GLP-1) / Sensory perception of sweet, bitter, and umami (glutamate) taste / photoreceptor disc membrane / cilium / Adrenaline,noradrenaline inhibits insulin secretion / Glucagon-type ligand receptors / Vasopressin regulates renal water homeostasis via Aquaporins / G alpha (z) signalling events / cellular response to catecholamine stimulus / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / ADORA2B mediated anti-inflammatory cytokines production / sensory perception of taste / ADP signalling through P2Y purinoceptor 1 / adenylate cyclase-activating dopamine receptor signaling pathway / G beta:gamma signalling through PI3Kgamma / cellular response to prostaglandin E stimulus / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / GPER1 signaling / G-protein beta-subunit binding / Inactivation, recovery and regulation of the phototransduction cascade / neuron projection development / heterotrimeric G-protein complex / G alpha (12/13) signalling events / extracellular vesicle / signaling receptor complex adaptor activity / Thrombin signalling through proteinase activated receptors (PARs) / GTPase binding / retina development in camera-type eye / phospholipase C-activating G protein-coupled receptor signaling pathway / Ca2+ pathway / G alpha (i) signalling events / positive regulation of cytosolic calcium ion concentration / fibroblast proliferation / G alpha (s) signalling events / G alpha (q) signalling events / cell population proliferation / Ras protein signal transduction / Extra-nuclear estrogen signaling / learning or memory / cell surface receptor signaling pathway / G protein-coupled receptor signaling pathway / lysosomal membrane / GTPase activity / synapse / protein-containing complex binding / signal transduction / positive regulation of transcription by RNA polymerase II / extracellular exosome / membrane / plasma membrane / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å | ||||||
![]() | Jiang, W. / Zheng, S. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural insights into galanin receptor signaling. Authors: Wentong Jiang / Sanduo Zheng / ![]() Abstract: Galanin is a biologically active neuropeptide, and functions through three distinct G protein–coupled receptors (GPCRs), namely GALR1, GALR2, and GALR3. GALR signaling plays important roles in ...Galanin is a biologically active neuropeptide, and functions through three distinct G protein–coupled receptors (GPCRs), namely GALR1, GALR2, and GALR3. GALR signaling plays important roles in regulating various physiological processes such as energy metabolism, neuropathic pain, epileptic activity, and sleep homeostasis. GALR1 and GALR3 signal through the Gi/o pathway, whereas GALR2 signals mainly through the Gq/11 pathway. However, the molecular basis for galanin recognition and G protein selectivity of GALRs remains poorly understood. Here, we report the cryoelectron microscopy structures of the GALR1-Go and the GALR2-Gq complexes bound to the endogenous ligand galanin or spexin. The galanin peptide mainly adopts an alpha helical structure, which binds at the extracellular vestibule of the receptors, nearly parallel to the membrane plane without penetrating deeply into the receptor core. Structural analysis combined with functional studies reveals important structural determinants for the G protein selectivity of GALRs as well as other class A GPCRs. In addition, we show that the zinc ion is a negative allosteric regulator of GALR1 but not GALR2. Our studies provide insight into the mechanisms of G protein selectivity of GPCRs and highlight a potential function of the neuromodulator zinc ion as a modulator of GPCR signaling in the central nervous system. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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PDBx/mmCIF format | ![]() | 204.8 KB | Display | ![]() |
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PDB format | ![]() | 159.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1 MB | Display | ![]() |
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Full document | ![]() | 1 MB | Display | |
Data in XML | ![]() | 39.4 KB | Display | |
Data in CIF | ![]() | 58.8 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 33231MC ![]() 7xjjC ![]() 7xjkC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
-Guanine nucleotide-binding protein ... , 3 types, 3 molecules BCD
#2: Protein | Mass: 28180.963 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
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#3: Protein | Mass: 38389.934 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#4: Protein | Mass: 7845.078 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
-Protein/peptide / Antibody / Protein , 3 types, 3 molecules AEF
#1: Protein/peptide | Mass: 1621.876 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() |
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#5: Antibody | Mass: 32071.615 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() |
#6: Protein | Mass: 36401.867 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: 3D ARRAY / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Spexin-bound Galanin receptor 2 in complex with Galphaq, Gbeta/gamma subunit and single chain variable fragment (scFv16) Type: COMPLEX / Entity ID: all / Source: RECOMBINANT | ||||||||||||||||||||
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Source (natural) | Organism: ![]() | ||||||||||||||||||||
Source (recombinant) | Organism: Homo sapiens, synthetic construct | ||||||||||||||||||||
Buffer solution | pH: 7.4 | ||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 5.6 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3 | ||||||||||||||||||||
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2300 nm / Nominal defocus min: 1200 nm |
Specimen holder | Cryogen: NITROGEN |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.19_4092: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 332603 / Symmetry type: POINT | ||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT / Space: REAL | ||||||||||||||||||||||||
Refine LS restraints |
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