5IJH

Structure of the SPX domain of the human phosphate transporter XPR1 in complex with a sulfate ion


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.43 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Control of eukaryotic phosphate homeostasis by inositol polyphosphate sensor domains.

Wild, R.Gerasimaite, R.Jung, J.Y.Truffault, V.Pavlovic, I.Schmidt, A.Saiardi, A.Jessen, H.J.Poirier, Y.Hothorn, M.Mayer, A.

(2016) Science 352: 986-990

  • DOI: 10.1126/science.aad9858
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Phosphorus is a macronutrient taken up by cells as inorganic phosphate (P(i)). How cells sense cellular P(i) levels is poorly characterized. Here, we report that SPX domains--which are found in eukaryotic phosphate transporters, signaling proteins, a ...

    Phosphorus is a macronutrient taken up by cells as inorganic phosphate (P(i)). How cells sense cellular P(i) levels is poorly characterized. Here, we report that SPX domains--which are found in eukaryotic phosphate transporters, signaling proteins, and inorganic polyphosphate polymerases--provide a basic binding surface for inositol polyphosphate signaling molecules (InsPs), the concentrations of which change in response to P(i) availability. Substitutions of critical binding surface residues impair InsP binding in vitro, inorganic polyphosphate synthesis in yeast, and P(i) transport in Arabidopsis In plants, InsPs trigger the association of SPX proteins with transcription factors to regulate P(i) starvation responses. We propose that InsPs communicate cytosolic P(i) levels to SPX domains and enable them to interact with a multitude of proteins to regulate P(i) uptake, transport, and storage in fungi, plants, and animals.


    Organizational Affiliation

    Structural Plant Biology Laboratory, Department of Botany and Plant Biology, University of Geneva, Geneva, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Xenotropic and polytropic retrovirus receptor 1
A, B
213Homo sapiensMutation(s): 0 
Gene Names: XPR1 (SYG1, XR)
Find proteins for Q9UBH6 (Homo sapiens)
Go to Gene View: XPR1
Go to UniProtKB:  Q9UBH6
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.43 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.201 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 65.950α = 90.00
b = 80.320β = 90.00
c = 97.860γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
BUSTERrefinement
XDSdata scaling
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-03-02 
  • Released Date: 2016-04-27 
  • Deposition Author(s): Wild, R., Hothorn, M.

Funding OrganizationLocationGrant Number
European Research CouncilSwitzerland310856

Revision History 

  • Version 1.0: 2016-04-27
    Type: Initial release
  • Version 1.1: 2016-06-01
    Type: Database references