5IJJ

Structure of the SPX domain of Chaetomium thermophilum Glycerophosphodiester Phosphodiesterase 1 in complex with inositol hexakisphosphate (InsP6)

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 

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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: https://doi.org/10.1126/science.aad9858
  • Primary Citation of Related Structures:  
    5IIG, 5IIQ, 5IIT, 5IJH, 5IJJ, 5IJP

  • 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, 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 ...

    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: 

    Department of Biochemistry, University of Lausanne, Lausanne, Switzerland. yves.poirier@unil.ch michael.hothorn@unige.ch andreas.mayer@unil.ch.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
SPX domain
A, B
192Thermochaetoides thermophilaMutation(s): 0 
Gene Names: CTHT_0005190
EC: 3.1.4.46 (PDB Primary Data), 3.1.4.2 (UniProt)
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.251 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.204 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.363α = 90
b = 53.366β = 113.42
c = 94.314γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
European Research CouncilSwitzerland310856

Revision History  (Full details and data files)

  • Version 1.0: 2016-04-27
    Type: Initial release
  • Version 1.1: 2016-06-01
    Changes: Database references
  • Version 2.0: 2020-10-07
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary