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- PDB-8wa3: Cryo-EM structure of peptide free and Gs-coupled GIPR -

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Entry
Database: PDB / ID: 8wa3
TitleCryo-EM structure of peptide free and Gs-coupled GIPR
Components
  • Gastric inhibitory polypeptide receptor,Fusion protein
  • Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
  • Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1,O-antigen polymerase
  • Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
  • Nanobody-35
KeywordsSTRUCTURAL PROTEIN / Glucose-dependent insulinotropic polypeptide receptor / cryo-electron microscopy / G protein-coupled receptor / ligand recognition
Function / homology
Function and homology information


gastric inhibitory peptide receptor activity / glucagon family peptide binding / gastric inhibitory peptide signaling pathway / sensory perception of chemical stimulus / endocrine pancreas development / desensitization of G protein-coupled receptor signaling pathway / response to fatty acid / mu-type opioid receptor binding / corticotropin-releasing hormone receptor 1 binding / G-protein activation ...gastric inhibitory peptide receptor activity / glucagon family peptide binding / gastric inhibitory peptide signaling pathway / sensory perception of chemical stimulus / endocrine pancreas development / desensitization of G protein-coupled receptor signaling pathway / response to fatty acid / mu-type opioid receptor binding / corticotropin-releasing hormone receptor 1 binding / G-protein activation / Activation of the phototransduction cascade / Glucagon-type ligand receptors / Thromboxane signalling through TP receptor / Sensory perception of sweet, bitter, and umami (glutamate) taste / G beta:gamma signalling through PI3Kgamma / G beta:gamma signalling through CDC42 / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / Activation of G protein gated Potassium channels / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / Ca2+ pathway / G alpha (z) signalling events / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / Vasopressin regulates renal water homeostasis via Aquaporins / G protein-coupled peptide receptor activity / Adrenaline,noradrenaline inhibits insulin secretion / ADP signalling through P2Y purinoceptor 12 / G alpha (q) signalling events / beta-2 adrenergic receptor binding / G alpha (i) signalling events / Thrombin signalling through proteinase activated receptors (PARs) / Activation of G protein gated Potassium channels / G-protein activation / G beta:gamma signalling through PI3Kgamma / Prostacyclin signalling through prostacyclin receptor / G beta:gamma signalling through PLC beta / ADP signalling through P2Y purinoceptor 1 / Thromboxane signalling through TP receptor / Presynaptic function of Kainate receptors / G beta:gamma signalling through CDC42 / Inhibition of voltage gated Ca2+ channels via Gbeta/gamma subunits / G alpha (12/13) signalling events / Glucagon-type ligand receptors / G beta:gamma signalling through BTK / ADP signalling through P2Y purinoceptor 12 / Adrenaline,noradrenaline inhibits insulin secretion / Cooperation of PDCL (PhLP1) and TRiC/CCT in G-protein beta folding / Ca2+ pathway / Thrombin signalling through proteinase activated receptors (PARs) / G alpha (z) signalling events / Extra-nuclear estrogen signaling / photoreceptor outer segment membrane / G alpha (s) signalling events / G alpha (q) signalling events / spectrin binding / G alpha (i) signalling events / Glucagon-like Peptide-1 (GLP1) regulates insulin secretion / High laminar flow shear stress activates signaling by PIEZO1 and PECAM1:CDH5:KDR in endothelial cells / Vasopressin regulates renal water homeostasis via Aquaporins / alkylglycerophosphoethanolamine phosphodiesterase activity / peptide hormone binding / photoreceptor outer segment / D1 dopamine receptor binding / response to glucose / response to axon injury / activation of adenylate cyclase activity / adenylate cyclase-activating adrenergic receptor signaling pathway / insulin-like growth factor receptor binding / cardiac muscle cell apoptotic process / photoreceptor inner segment / ionotropic glutamate receptor binding / response to nutrient / regulation of insulin secretion / adenylate cyclase activator activity / generation of precursor metabolites and energy / response to calcium ion / positive regulation of insulin secretion / adenylate cyclase-modulating G protein-coupled receptor signaling pathway / G-protein beta/gamma-subunit complex binding / adenylate cyclase-activating G protein-coupled receptor signaling pathway / Glucagon-type ligand receptors / cellular response to catecholamine stimulus / transmembrane signaling receptor activity / adenylate cyclase-activating dopamine receptor signaling pathway / cellular response to prostaglandin E stimulus / G-protein beta-subunit binding / heterotrimeric G-protein complex / sensory perception of taste / signaling receptor complex adaptor activity / retina development in camera-type eye / positive regulation of cytosolic calcium ion concentration / cell body / GTPase binding / G alpha (s) signalling events / phospholipase C-activating G protein-coupled receptor signaling pathway / cellular response to hypoxia / Hydrolases; Acting on acid anhydrides; Acting on GTP to facilitate cellular and subcellular movement / cell surface receptor signaling pathway / cell population proliferation / G protein-coupled receptor signaling pathway
Similarity search - Function
O-antigen ligase-related / : / O-Antigen ligase / GPCR, family 2, gastric inhibitory polypeptide receptor / G-protein coupled receptors family 2 signature 1. / : / GPCR, family 2, extracellular hormone receptor domain / G-protein coupled receptors family 2 profile 1. / Domain present in hormone receptors / Hormone receptor domain ...O-antigen ligase-related / : / O-Antigen ligase / GPCR, family 2, gastric inhibitory polypeptide receptor / G-protein coupled receptors family 2 signature 1. / : / GPCR, family 2, extracellular hormone receptor domain / G-protein coupled receptors family 2 profile 1. / Domain present in hormone receptors / Hormone receptor domain / GPCR family 2, extracellular hormone receptor domain superfamily / G-protein coupled receptors family 2 signature 2. / GPCR, family 2, secretin-like, conserved site / GPCR, family 2, secretin-like / 7 transmembrane receptor (Secretin family) / GPCR, family 2-like / G-protein coupled receptors family 2 profile 2. / G-protein alpha subunit, group S / Guanine nucleotide binding protein (G-protein), alpha subunit / G protein alpha subunit, helical insertion / G-protein alpha subunit / G-alpha domain profile. / G protein alpha subunit / G-protein, gamma subunit / G-protein gamma subunit domain profile. / G-protein gamma-like domain / G-protein gamma-like domain superfamily / GGL domain / G protein gamma subunit-like motifs / GGL domain / G protein beta WD-40 repeat protein / Guanine nucleotide-binding protein, beta subunit / G-protein, beta subunit / G-protein beta WD-40 repeat / WD40 repeat, conserved site / Trp-Asp (WD) repeats signature. / Trp-Asp (WD) repeats profile. / Trp-Asp (WD) repeats circular profile. / WD40 repeats / WD40 repeat / WD40-repeat-containing domain superfamily / WD40/YVTN repeat-like-containing domain superfamily / P-loop containing nucleoside triphosphate hydrolase
Similarity search - Domain/homology
O-antigen ligase-related domain-containing protein / Guanine nucleotide-binding protein G(s) subunit alpha isoforms short / Gastric inhibitory polypeptide receptor / Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1 / Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
Similarity search - Component
Biological speciesHomo sapiens (human)
Bos taurus (domestic cattle)
Rattus norvegicus (Norway rat)
Leptolinea tardivitalis (bacteria)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.86 Å
AuthorsCong, Z.T. / Zhao, F.H. / Li, Y. / Luo, G. / Zhou, Q.T. / Yang, D.H. / Wang, M.W.
Funding support China, 4items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)81872915 China
National Natural Science Foundation of China (NSFC)21704064 China
National Natural Science Foundation of China (NSFC)81773792 China
National Natural Science Foundation of China (NSFC)32071203 China
CitationJournal: Cell Discov / Year: 2024
Title: Molecular features of the ligand-free GLP-1R, GCGR and GIPR in complex with G proteins.
Authors: Zhaotong Cong / Fenghui Zhao / Yang Li / Gan Luo / Yiting Mai / Xianyue Chen / Yanyan Chen / Shi Lin / Xiaoqing Cai / Qingtong Zhou / Dehua Yang / Ming-Wei Wang /
Abstract: Class B1 G protein-coupled receptors (GPCRs) are important regulators of many physiological functions such as glucose homeostasis, which is mainly mediated by three peptide hormones, i.e., glucagon- ...Class B1 G protein-coupled receptors (GPCRs) are important regulators of many physiological functions such as glucose homeostasis, which is mainly mediated by three peptide hormones, i.e., glucagon-like peptide-1 (GLP-1), glucagon (GCG), and glucose-dependent insulinotropic polypeptide (GIP). They trigger a cascade of signaling events leading to the formation of an active agonist-receptor-G protein complex. However, intracellular signal transducers can also activate the receptor independent of extracellular stimuli, suggesting an intrinsic role of G proteins in this process. Here, we report cryo-electron microscopy structures of the human GLP-1 receptor (GLP-1R), GCG receptor (GCGR), and GIP receptor (GIPR) in complex with G proteins without the presence of cognate ligands. These ligand-free complexes share a similar intracellular architecture to those bound by endogenous peptides, in which, the G protein alone directly opens the intracellular binding cavity and rewires the extracellular orthosteric pocket to stabilize the receptor in a state unseen before. While the peptide-binding site is partially occupied by the inward folded transmembrane helix 6 (TM6)-extracellular loop 3 (ECL3) juncture of GIPR or a segment of GCGR ECL2, the extracellular portion of GLP-1R adopts a conformation close to the active state. Our findings offer valuable insights into the distinct activation mechanisms of these three important receptors. It is possible that in the absence of a ligand, the intracellular half of transmembrane domain is mobilized with the help of G protein, which in turn rearranges the extracellular half to form a transitional conformation, facilitating the entry of the peptide N-terminus.
History
DepositionSep 6, 2023Deposition site: PDBJ / Processing site: PDBC
Revision 1.0Mar 6, 2024Provider: repository / Type: Initial release
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Revision 1.1Oct 16, 2024Group: Data collection / Structure summary
Category: em_admin / pdbx_entry_details / pdbx_modification_feature
Item: _em_admin.last_update / _pdbx_entry_details.has_protein_modification
Revision 1.2Apr 23, 2025Group: Data collection / Category: em_admin / Item: _em_admin.last_update
Revision 1.1Apr 23, 2025Data content type: EM metadata / Data content type: EM metadata / Group: Experimental summary / Data content type: EM metadata / Category: em_admin / Data content type: EM metadata / Item: _em_admin.last_update
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Revision 1.2Jul 23, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
R: Gastric inhibitory polypeptide receptor,Fusion protein
A: Guanine nucleotide-binding protein G(s) subunit alpha isoforms short
B: Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1,O-antigen polymerase
G: Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2
N: Nanobody-35


Theoretical massNumber of molelcules
Total (without water)174,1255
Polymers174,1255
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Gastric inhibitory polypeptide receptor,Fusion protein / GIP-R / Glucose-dependent insulinotropic polypeptide receptor


Mass: 64950.695 Da / Num. of mol.: 1 / Mutation: T345F
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: GIPR / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P48546
#2: Protein Guanine nucleotide-binding protein G(s) subunit alpha isoforms short / Adenylate cyclase-stimulating G alpha protein


Mass: 45743.441 Da / Num. of mol.: 1
Mutation: S54N, G226A, E268A, N271K, K274D, R280K, T284D, I285T, A366S
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: GNAS, GNAS1 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P04896
#3: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(T) subunit beta-1,O-antigen polymerase / Transducin beta chain 1


Mass: 40226.992 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Rattus norvegicus (Norway rat), (gene. exp.) Leptolinea tardivitalis (bacteria)
Gene: Gnb1, ADM99_06940 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P54311, UniProt: A0A0P6XLS5
#4: Protein Guanine nucleotide-binding protein G(I)/G(S)/G(O) subunit gamma-2 / G gamma-I


Mass: 7861.143 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Bos taurus (domestic cattle) / Gene: GNG2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P63212
#5: Antibody Nanobody-35


Mass: 15343.019 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) synthetic construct (others) / Production host: Escherichia coli (E. coli)
Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Cryo-EM structure of the human glucose-dependent insulinotropic polypeptide receptor in complex with GIP and G protein
Type: COMPLEX / Entity ID: all / Source: MULTIPLE SOURCES
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Cryo-EM structure of peptide free and Gs-coupled GIPR
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: OTHER / Accelerating voltage: 300 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2200 nm / Nominal defocus min: 1200 nm
Image recordingElectron dose: 80 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.86 Å / Resolution method: OTHER / Num. of particles: 807839 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0048644
ELECTRON MICROSCOPYf_angle_d0.80311735
ELECTRON MICROSCOPYf_dihedral_angle_d7.9171355
ELECTRON MICROSCOPYf_chiral_restr0.0491341
ELECTRON MICROSCOPYf_plane_restr0.0031459

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