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- PDB-9ddw: Cryo-EM structure of the human P2X2 receptor in conformation I of... -

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Basic information

Entry
Database: PDB / ID: 9ddw
TitleCryo-EM structure of the human P2X2 receptor in conformation I of the ATP-bound desensitized state
ComponentsP2X purinoceptor 2
KeywordsMEMBRANE PROTEIN / Ion Channel / Ligand-gated Ion Channel / P2X Receptor / P2XR / ATP
Function / homology
Function and homology information


detection of hypoxic conditions in blood by carotid body chemoreceptor signaling / Platelet homeostasis / extracellularly ATP-gated monoatomic cation channel activity / purinergic nucleotide receptor activity / peristalsis / Elevation of cytosolic Ca2+ levels / neuromuscular synaptic transmission / urinary bladder smooth muscle contraction / response to carbohydrate / ligand-gated monoatomic ion channel activity ...detection of hypoxic conditions in blood by carotid body chemoreceptor signaling / Platelet homeostasis / extracellularly ATP-gated monoatomic cation channel activity / purinergic nucleotide receptor activity / peristalsis / Elevation of cytosolic Ca2+ levels / neuromuscular synaptic transmission / urinary bladder smooth muscle contraction / response to carbohydrate / ligand-gated monoatomic ion channel activity / response to ATP / neuromuscular junction development / behavioral response to pain / positive regulation of calcium ion transport into cytosol / neuronal dense core vesicle / skeletal muscle fiber development / positive regulation of calcium-mediated signaling / response to ischemia / sensory perception of sound / calcium ion transmembrane transport / sensory perception of taste / response to hypoxia / receptor complex / postsynapse / apical plasma membrane / neuronal cell body / ATP binding / identical protein binding / plasma membrane
Similarity search - Function
P2X2 purinoceptor / : / ATP P2X receptors signature. / ATP P2X receptor / P2X purinoreceptor / P2X purinoreceptor extracellular domain superfamily
Similarity search - Domain/homology
ADENOSINE-5'-TRIPHOSPHATE / P2X purinoceptor 2
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.49 Å
AuthorsWestermann, F.G. / Oken, A.C. / Muller, C.E. / Mansoor, S.E.
Funding support United States, 2items
OrganizationGrant numberCountry
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)R00HL138129 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)DP2GM149551 United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2025
Title: Subtype-specific structural features of the hearing loss-associated human P2X2 receptor.
Authors: Franka G Westermann / Adam C Oken / Philip K E Granith / Parthiban Marimuthu / Christa E Müller / Steven E Mansoor /
Abstract: The P2X2 receptor (P2X2R) is a slowly desensitizing adenosine triphosphate (ATP)-gated ion channel that is highly expressed in the cochlea. When mutated, the P2X2R exacerbates age- and noise-related ...The P2X2 receptor (P2X2R) is a slowly desensitizing adenosine triphosphate (ATP)-gated ion channel that is highly expressed in the cochlea. When mutated, the P2X2R exacerbates age- and noise-related hearing loss, but selective modulators of the receptor are lacking, and the molecular basis of activation and desensitization remains poorly understood. Here, we determine high-resolution cryoelectron microscopy structures of the full-length wild-type human P2X2R in an apo closed state and two distinct ATP-bound desensitized states. In the apo closed state structure, we observe features unique to the P2X2R and locate disease mutations within or near the transmembrane domain. In addition, our ATP-bound structures show how free anionic ATP forms subtype-specific interactions with the orthosteric binding site. We identify and characterize two different ATP-bound desensitized state structures, one similar to published models for other P2XR subtypes, and a second alternate conformation not previously observed. A loop adjacent to the orthosteric binding site between these two ATP-bound desensitized state structures undergoes significant conformational changes. These movements are supported by multireplicate, microsecond-scale molecular dynamics simulation studies and suggest a path by which ATP could enter or leave the orthosteric pocket. Together, our results provide structural insights into the P2X2R, facilitating structure-based drug development for this therapeutically important target.
History
DepositionAug 28, 2024Deposition site: RCSB / Processing site: RCSB
Revision 1.0Sep 24, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: P2X purinoceptor 2
B: P2X purinoceptor 2
C: P2X purinoceptor 2
hetero molecules


Theoretical massNumber of molelcules
Total (without water)158,29412
Polymers155,4453
Non-polymers2,8499
Water2,864159
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

#1: Protein P2X purinoceptor 2 / P2X2 / ATP receptor / Purinergic receptor


Mass: 51814.996 Da / Num. of mol.: 3
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: P2RX2, P2X2 / Cell line (production host): HEK293 GNTI- / Production host: Homo sapiens (human) / References: UniProt: Q9UBL9
#2: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 6 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0
#3: Chemical ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 3 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
#4: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 159 / Source method: isolated from a natural source / Formula: H2O
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: Homotrimeric hP2X2 / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human) / Cell: HEK293 GNTI-
Buffer solutionpH: 7
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen 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: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Calibrated magnification: 130000 X / Nominal defocus max: 1500 nm / Nominal defocus min: 900 nm / Cs: 2.7 mm / C2 aperture diameter: 50 µm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 45 e/Å2 / Film or detector model: GATAN K3 BIOCONTINUUM (6k x 4k) / Num. of real images: 15645
EM imaging opticsEnergyfilter slit width: 20 eV

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
SymmetryPoint symmetry: C3 (3 fold cyclic)
3D reconstructionResolution: 2.49 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 411445 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0077680
ELECTRON MICROSCOPYf_angle_d0.95610455
ELECTRON MICROSCOPYf_dihedral_angle_d16.2532754
ELECTRON MICROSCOPYf_chiral_restr0.2651185
ELECTRON MICROSCOPYf_plane_restr0.0051299

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