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- PDB-9ijy: Homo sapiens Xenotropic and Polytropic Retrovirus Receptor 1 (XPR... -

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Basic information

Entry
Database: PDB / ID: 9ijy
TitleHomo sapiens Xenotropic and Polytropic Retrovirus Receptor 1 (XPR1) with Y22A/E23A/K26A mutations
ComponentsSolute carrier family 53 member 1
KeywordsPROTEIN TRANSPORT / Pi exporter / a key regulator of cellular Pi homeostasis
Function / homology
Function and homology information


phosphate transmembrane transporter activity / phosphate ion transport / intracellular phosphate ion homeostasis / phosphate ion transmembrane transport / cellular response to phosphate starvation / inositol hexakisphosphate binding / efflux transmembrane transporter activity / response to virus / virus receptor activity / plasma membrane
Similarity search - Function
EXS, C-terminal / EXS family / EXS domain profile. / SPX domain / SPX domain / SPX domain profile.
Similarity search - Domain/homology
Chem-6PL / PHOSPHATE ION / Solute carrier family 53 member 1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.64 Å
AuthorsHe, Q.X. / Zhang, R. / Chen, Q.F. / Li, B.B.
Funding support China, 2items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)32071202 China
National Natural Science Foundation of China (NSFC)32271012 China
CitationJournal: Nat Commun / Year: 2025
Title: Structural basis of phosphate export by human XPR1.
Authors: Qixian He / Ran Zhang / Sandrine Tury / Valérie Courgnaud / Fenglian Liu / Jean-Luc Battini / Baobin Li / Qingfeng Chen /
Abstract: Phosphorus in crucial for all living organisms. In vertebrate, cellular phosphate homeostasis is partly controlled by XPR1, a poorly characterized inositol pyrophosphate-dependent phosphate exporter. ...Phosphorus in crucial for all living organisms. In vertebrate, cellular phosphate homeostasis is partly controlled by XPR1, a poorly characterized inositol pyrophosphate-dependent phosphate exporter. Here, we report the cryo-EM structure of human XPR1, which forms a loose dimer with 10 transmembrane helices (TM) in each protomer. The structure consists of a scaffold domain (TM1, TM3-4) and a core domain (TM2, TM5-10) structurally related to ion-translocating rhodopsins. Bound phosphate is observed in a tunnel within the core domain at a narrow point that separates the tunnel into intracellular and extracellular vestibules. This site contains a cluster of basic residues that coordinate phosphate and a conserved W573 essential for export function. Loss of inositol pyrophosphate binding is accompanied by structural movements in TM9 and the W573 sidechain, closing the extracellular vestibule and blocking phosphate export. These findings provide insight into XPR1 mechanism and pave the way for further in-depth XPR1 studies.
History
DepositionJun 25, 2024Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jan 22, 2025Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: Solute carrier family 53 member 1
B: Solute carrier family 53 member 1
hetero molecules


Theoretical massNumber of molelcules
Total (without water)167,9436
Polymers166,2272
Non-polymers1,7164
Water00
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 Solute carrier family 53 member 1 / Phosphate exporter SLC53A1 / Protein SYG1 homolog / Xenotropic and polytropic murine leukemia virus ...Phosphate exporter SLC53A1 / Protein SYG1 homolog / Xenotropic and polytropic murine leukemia virus receptor X3 / X-receptor / Xenotropic and polytropic retrovirus receptor 1


Mass: 83113.445 Da / Num. of mol.: 2 / Mutation: Y22A,E23A,K26A
Source method: isolated from a genetically manipulated source
Details: Residues 697-704 correspond to flexible linkers and residues 705-712 correspond to the strep ll tag. Among them, residue 22 tyrosine mutated to alanine, residue 23 glutamic acid mutated to ...Details: Residues 697-704 correspond to flexible linkers and residues 705-712 correspond to the strep ll tag. Among them, residue 22 tyrosine mutated to alanine, residue 23 glutamic acid mutated to alanine, and residue 26 lysine mutated to alanine.
Source: (gene. exp.) Homo sapiens (human) / Gene: XPR1, SLC53A1, SYG1, X3 / Production host: Homo sapiens (human) / References: UniProt: Q9UBH6
#2: Chemical ChemComp-PO4 / PHOSPHATE ION


Mass: 94.971 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: PO4 / Feature type: SUBJECT OF INVESTIGATION
#3: Chemical ChemComp-6PL / (4S,7R)-4-HYDROXY-N,N,N-TRIMETHYL-9-OXO-7-[(PALMITOYLOXY)METHYL]-3,5,8-TRIOXA-4-PHOSPHAHEXACOSAN-1-AMINIUM 4-OXIDE / 1-PALMITOYL-2-STEAROYL-SN-GLYCERO-3-PHOSPHOCHOLINE


Mass: 763.100 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: C42H85NO8P / Comment: phospholipid*YM
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: Dimer of XPR1 mutant / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.081535 MDa / Experimental value: NO
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.4
SpecimenConc.: 4 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 1600 nm / Nominal defocus min: 800 nm
Image recordingElectron dose: 49.97 e/Å2 / Film or detector model: TFS FALCON 4i (4k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.64 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 247144 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.0036764
ELECTRON MICROSCOPYf_angle_d0.589200
ELECTRON MICROSCOPYf_dihedral_angle_d4.362866
ELECTRON MICROSCOPYf_chiral_restr0.041004
ELECTRON MICROSCOPYf_plane_restr0.0031118

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