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- PDB-8x5b: Cryo-EM structures of human XPR1 in closed states -

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Basic information

Entry
Database: PDB / ID: 8x5b
TitleCryo-EM structures of human XPR1 in closed states
ComponentsSolute carrier family 53 member 1
KeywordsTRANSPORT PROTEIN / transport
Function / homology
Function and homology information


phosphate transmembrane transporter activity / phosphate ion transport / intracellular phosphate ion homeostasis / inositol hexakisphosphate binding / phosphate ion transmembrane transport / cellular response to phosphate starvation / efflux transmembrane transporter activity / response to virus / virus receptor activity / Golgi apparatus ...phosphate transmembrane transporter activity / phosphate ion transport / intracellular phosphate ion homeostasis / inositol hexakisphosphate binding / phosphate ion transmembrane transport / cellular response to phosphate starvation / efflux transmembrane transporter activity / response to virus / virus receptor activity / Golgi apparatus / plasma membrane / cytoplasm
Similarity search - Function
EXS, C-terminal / EXS family / EXS domain profile. / SPX domain / SPX domain / SPX domain profile.
Similarity search - Domain/homology
CHOLESTEROL / PHOSPHATE ION / Chem-POV / Solute carrier family 53 member 1
Similarity search - Component
Biological speciesHomo sapiens (human)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.84 Å
AuthorsJiang, D.H. / Yan, R.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC) China
CitationJournal: Nature / Year: 2024
Title: Human XPR1 structures reveal phosphate export mechanism.
Authors: Rui Yan / Huiwen Chen / Chuanyu Liu / Jun Zhao / Di Wu / Juquan Jiang / Jianke Gong / Daohua Jiang /
Abstract: Inorganic phosphate (Pi) is a fundamental macronutrient for all living organisms, the homeostasis of which is critical for numerous biological activities. As the only known human Pi exporter to date, ...Inorganic phosphate (Pi) is a fundamental macronutrient for all living organisms, the homeostasis of which is critical for numerous biological activities. As the only known human Pi exporter to date, XPR1 has an indispensable role in cellular Pi homeostasis. Dysfunction of XPR1 is associated with neurodegenerative disease. However, the mechanisms underpinning XPR1-mediated Pi efflux and regulation by the intracellular inositol polyphosphate (InsPP) sensor SPX domain remain poorly understood. Here we present cryo-electron microscopy structures of human XPR1 in Pi-bound closed, open and InsP-bound forms, revealing the structural basis for XPR1 gating and regulation by InsPPs. XPR1 consists of an N-terminal SPX domain, a dimer-formation core domain and a Pi transport domain. Within the transport domain, three basic clusters are responsible for Pi binding and transport, and a conserved W573 acts as a molecular switch for gating. In addition, the SPX domain binds to InsP and facilitates Pi efflux by liberating the C-terminal loop that limits Pi entry. This study provides a conceptual framework for the mechanistic understanding of Pi homeostasis by XPR1 homologues in fungi, plants and animals.
History
DepositionNov 16, 2023Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0Jul 3, 2024Provider: repository / Type: Initial release
Revision 1.1Aug 28, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.title / _citation.year / _em_admin.last_update
Revision 1.2Sep 4, 2024Group: Data collection / Database references / Category: citation / citation_author / em_admin
Item: _citation.pdbx_database_id_PubMed / _citation.title ..._citation.pdbx_database_id_PubMed / _citation.title / _citation_author.name / _em_admin.last_update
Revision 1.3Oct 9, 2024Group: Data collection / Database references / Structure summary
Category: citation / em_admin / pdbx_entry_details
Item: _citation.journal_volume / _citation.page_first ..._citation.journal_volume / _citation.page_first / _citation.page_last / _em_admin.last_update / _pdbx_entry_details.has_protein_modification

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

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


Theoretical massNumber of molelcules
Total (without water)124,87730
Polymers109,6632
Non-polymers15,21428
Water25214
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 Solute carrier family 53 member 1


Mass: 54831.422 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Homo sapiens (human) / Gene: XPR1 / Cell line (production host): HEK293 / Production host: Homo sapiens (human) / References: UniProt: Q9UBH6
#2: Chemical
ChemComp-PO4 / PHOSPHATE ION


Mass: 94.971 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: PO4
#3: Chemical
ChemComp-POV / (2S)-3-(hexadecanoyloxy)-2-[(9Z)-octadec-9-enoyloxy]propyl 2-(trimethylammonio)ethyl phosphate / POPC


Mass: 760.076 Da / Num. of mol.: 18 / Source method: obtained synthetically / Formula: C42H82NO8P / Feature type: SUBJECT OF INVESTIGATION / Comment: phospholipid*YM
#4: Chemical ChemComp-CLR / CHOLESTEROL


Mass: 386.654 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Formula: C27H46O
#5: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 14 / Source method: isolated from a natural source / Formula: H2O
Has ligand of interestY
Has protein modificationN

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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: transport / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Source (natural)Organism: Homo sapiens (human)
Source (recombinant)Organism: Homo sapiens (human)
Buffer solutionpH: 7.5
SpecimenEmbedding 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: FEI TITAN KRIOS
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: 60 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.84 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 253874 / Symmetry type: POINT

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