Crystal structure of the yeast PX-domain protein Grd19p (sorting nexin 3) complexed to phosphatidylinosytol-3-phosphate.

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.221 

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Crystal structure of the yeast Phox homology (PX) domain protein Grd19p complexed to phosphatidylinositol-3-phosphate.

Zhou, C.Z.Li de La Sierra-Gallay, I.Quevillon-Cheruel, S.Collinet, B.Minard, P.Blondeau, K.Henckes, G.Aufrere, R.Leulliot, N.Graille, M.Sorel, I.Savarin, P.de la Torre, F.Poupon, A.Janin, J.van Tilbeurgh, H.

(2003) J Biol Chem 278: 50371-50376

  • DOI: https://doi.org/10.1074/jbc.M304392200
  • Primary Citation of Related Structures:  
    1OCS, 1OCU

  • PubMed Abstract: 

    Phox homology (PX) domains have been recently identified in a number of different proteins and are involved in various cellular functions such as vacuolar targeting and membrane protein trafficking. It was shown that these modules of about 130 amino acids specifically binding to phosphoinositides and that this interaction is crucial for their cellular function. The yeast genome contains 17 PX domain proteins. One of these, Grd19p, is involved in the localization of the late Golgi membrane proteins DPAP A and Kex2p. Grd19p consists of the PX domain with 30 extra residues at the N-terminal and is homologous to the functionally characterized human sorting nexin protein SNX3. We determined the 2.0 A crystal structure of Grd19p in the free form and in complex with d-myo-phosphatidylinositol 3-phosphate (diC4PtdIns(3)P), representing the first case of both free and ligand-bound conformations of the same PX module. The ligand occupies a well defined positively charged binding pocket at the interface between the beta-sheet and alpha-helical parts of the molecule. The structure of the free and bound protein are globally similar but show some significant differences in a region containing a polyproline peptide and a putative membrane attachment site.

  • Organizational Affiliation

    Institut de Biochimie et de Biophysique Moléculaire et Cellulaire (CNRS-Unité Mixte de Recherche 8619), Université Paris-Sud, Bât. 430, 91405 Orsay, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
162Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: SNX3GRD19YOR357C
Membrane Entity: Yes 
Find proteins for Q08826 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q08826 
Go to UniProtKB:  Q08826
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ08826
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on PIB

Download Ideal Coordinates CCD File 
C [auth A],
D [auth B]
C17 H32 O16 P2
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on CME
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.256 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.221 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 31.43α = 110.75
b = 55.76β = 97.35
c = 64.75γ = 99.49
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2003-12-12
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-02-14
    Changes: Database references, Source and taxonomy, Structure summary