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- PDB-8ihk: Cryo-EM structure of HCA3-Gi complex with acifran (local) -

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Basic information

Entry
Database: PDB / ID: 8ihk
TitleCryo-EM structure of HCA3-Gi complex with acifran (local)
ComponentsSoluble cytochrome b562,Hydroxycarboxylic acid receptor 3
KeywordsSIGNALING PROTEIN / GPCR
Function / homology
Function and homology information


nicotinic acid receptor activity / Hydroxycarboxylic acid-binding receptors / electron transport chain / G protein-coupled receptor activity / cell junction / G alpha (i) signalling events / periplasmic space / electron transfer activity / G protein-coupled receptor signaling pathway / iron ion binding ...nicotinic acid receptor activity / Hydroxycarboxylic acid-binding receptors / electron transport chain / G protein-coupled receptor activity / cell junction / G alpha (i) signalling events / periplasmic space / electron transfer activity / G protein-coupled receptor signaling pathway / iron ion binding / heme binding / plasma membrane
Similarity search - Function
: / Cytochrome b562 / Cytochrome b562 / Cytochrome c/b562 / G-protein coupled receptors family 1 signature. / G protein-coupled receptor, rhodopsin-like / GPCR, rhodopsin-like, 7TM / G-protein coupled receptors family 1 profile. / 7 transmembrane receptor (rhodopsin family)
Similarity search - Domain/homology
Chem-P9X / Soluble cytochrome b562 / Hydroxycarboxylic acid receptor 3
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
Homo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.21 Å
AuthorsSuzuki, S. / Nishikawa, K. / Suzuki, H. / Fujiyoshi, Y.
Funding support Japan, 1items
OrganizationGrant numberCountry
Japan Society for the Promotion of Science (JSPS)20H00451 Japan
CitationJournal: Nat Commun / Year: 2023
Title: Structural basis of hydroxycarboxylic acid receptor signaling mechanisms through ligand binding.
Authors: Shota Suzuki / Kotaro Tanaka / Kouki Nishikawa / Hiroshi Suzuki / Atsunori Oshima / Yoshinori Fujiyoshi /
Abstract: Hydroxycarboxylic acid receptors (HCA) are expressed in various tissues and immune cells. HCA2 and its agonist are thus important targets for treating inflammatory and metabolic disorders. Only ...Hydroxycarboxylic acid receptors (HCA) are expressed in various tissues and immune cells. HCA2 and its agonist are thus important targets for treating inflammatory and metabolic disorders. Only limited information is available, however, on the active-state binding of HCAs with agonists. Here, we present cryo-EM structures of human HCA2-Gi and HCA3-Gi signaling complexes binding with multiple compounds bound. Agonists were revealed to form a salt bridge with arginine, which is conserved in the HCA family, to activate these receptors. Extracellular regions of the receptors form a lid-like structure that covers the ligand-binding pocket. Although transmembrane (TM) 6 in HCAs undergoes dynamic conformational changes, ligands do not directly interact with amino acids in TM6, suggesting that indirect signaling induces a slight shift in TM6 to activate Gi proteins. Structural analyses of agonist-bound HCA2 and HCA3 together with mutagenesis and molecular dynamics simulation provide molecular insights into HCA ligand recognition and activation mechanisms.
History
DepositionFeb 22, 2023Deposition site: PDBJ / Processing site: PDBJ
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Revision 1.1Dec 6, 2023Group: Database references / Category: citation
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.journal_volume / _citation.page_first / _citation.page_last / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year
Revision 1.2Oct 30, 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 1.3Jun 25, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
R: Soluble cytochrome b562,Hydroxycarboxylic acid receptor 3
hetero molecules


Theoretical massNumber of molelcules
Total (without water)60,9682
Polymers60,7491
Non-polymers2181
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

#1: Protein Soluble cytochrome b562,Hydroxycarboxylic acid receptor 3 / Cytochrome b-562 / G-protein coupled receptor 109B / G-protein coupled receptor HM74 / G-protein ...Cytochrome b-562 / G-protein coupled receptor 109B / G-protein coupled receptor HM74 / G-protein coupled receptor HM74B / Niacin receptor 2 / Nicotinic acid receptor 2


Mass: 60749.406 Da / Num. of mol.: 1 / Mutation: M29W,H124I
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (E. coli), (gene. exp.) Homo sapiens (human)
Gene: cybC, HCAR3, GPR109B, HCA3, HM74B, NIACR2 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: P0ABE7, UniProt: P49019
#2: Chemical ChemComp-P9X / (5~{S})-5-methyl-4-oxidanylidene-5-phenyl-furan-2-carboxylic acid / Acifran


Mass: 218.205 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C12H10O4 / Feature type: SUBJECT OF INVESTIGATION
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: Multiprotein complex / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
21Escherichia coli (E. coli)562
31Homo sapiens (human)9606
Source (recombinant)Organism: Spodoptera frugiperda (fall armyworm)
Buffer solutionpH: 7.4
SpecimenConc.: 15 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: This sample was monodisperse
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 298 K

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Electron microscopy imaging

MicroscopyModel: JEOL CRYO ARM 300
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm
Image recordingElectron dose: 49 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: 3.21 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 95567 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0022322
ELECTRON MICROSCOPYf_angle_d0.4873167
ELECTRON MICROSCOPYf_dihedral_angle_d3.427313
ELECTRON MICROSCOPYf_chiral_restr0.038368
ELECTRON MICROSCOPYf_plane_restr0.004392

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