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Open data
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Basic information
Entry | Database: PDB / ID: 8ihk | ||||||
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Title | Cryo-EM structure of HCA3-Gi complex with acifran (local) | ||||||
![]() | Soluble cytochrome b562,Hydroxycarboxylic acid receptor 3 | ||||||
![]() | SIGNALING PROTEIN / GPCR | ||||||
Function / homology | ![]() nicotinic acid receptor activity / Hydroxycarboxylic acid-binding receptors / G protein-coupled receptor activity / electron transport chain / cell junction / G alpha (i) signalling events / periplasmic space / electron transfer activity / iron ion binding / G protein-coupled receptor signaling pathway ...nicotinic acid receptor activity / Hydroxycarboxylic acid-binding receptors / G protein-coupled receptor activity / electron transport chain / cell junction / G alpha (i) signalling events / periplasmic space / electron transfer activity / iron ion binding / G protein-coupled receptor signaling pathway / heme binding / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.21 Å | ||||||
![]() | Suzuki, S. / Nishikawa, K. / Suzuki, H. / Fujiyoshi, Y. | ||||||
Funding support | ![]()
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![]() | ![]() 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. | ||||||
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 77.1 KB | Display | ![]() |
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PDB format | ![]() | 51.1 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.3 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 24.9 KB | Display | |
Data in CIF | ![]() | 34 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 35447MC ![]() 8ihbC ![]() 8ihfC ![]() 8ihhC ![]() 8ihiC ![]() 8ihjC 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
#1: Protein | Mass: 60749.406 Da / Num. of mol.: 1 / Mutation: M29W,H124I Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() Gene: cybC, HCAR3, GPR109B, HCA3, HM74B, NIACR2 / Production host: ![]() ![]() |
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#2: Chemical | ChemComp-P9X / ( |
Has ligand of interest | Y |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Multiprotein complex / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT | ||||||||||||
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Molecular weight | Experimental value: NO | ||||||||||||
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Source (recombinant) | Organism: ![]() ![]() | ||||||||||||
Buffer solution | pH: 7.4 | ||||||||||||
Specimen | Conc.: 15 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: This sample was monodisperse | ||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 298 K |
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Electron microscopy imaging
Microscopy | Model: JEOL CRYO ARM 300 |
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Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 2000 nm / Nominal defocus min: 1000 nm |
Image recording | Electron dose: 49 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||
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3D reconstruction | Resolution: 3.21 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 95567 / Symmetry type: POINT | ||||||||||||||||||||||||
Refine LS restraints |
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