4P2I

Crystal structure of the mouse SNX19 PX domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Structural Basis for Different Phosphoinositide Specificities of the PX Domains of Sorting Nexins Regulating G-protein Signaling.

Mas, C.Norwood, S.J.Bugarcic, A.Kinna, G.Leneva, N.Kovtun, O.Ghai, R.Ona Yanez, L.E.Davis, J.L.Teasdale, R.D.Collins, B.M.

(2014) J Biol Chem 289: 28554-28568

  • DOI: 10.1074/jbc.M114.595959
  • Primary Citation of Related Structures:  
    4P2I, 4P2J, 4PQO, 4PQP

  • PubMed Abstract: 
  • Sorting nexins (SNXs) or phox homology (PX) domain containing proteins are central regulators of cell trafficking and signaling. A subfamily of PX domain proteins possesses two unique PX-associated domains, as well as a regulator of G protein-coupled receptor signaling (RGS) domain that attenuates Gαs-coupled G protein-coupled receptor signaling ...

    Sorting nexins (SNXs) or phox homology (PX) domain containing proteins are central regulators of cell trafficking and signaling. A subfamily of PX domain proteins possesses two unique PX-associated domains, as well as a regulator of G protein-coupled receptor signaling (RGS) domain that attenuates Gαs-coupled G protein-coupled receptor signaling. Here we delineate the structural organization of these RGS-PX proteins, revealing a protein family with a modular architecture that is conserved in all eukaryotes. The one exception to this is mammalian SNX19, which lacks the typical RGS structure but preserves all other domains. The PX domain is a sensor of membrane phosphoinositide lipids and we find that specific sequence alterations in the PX domains of the mammalian RGS-PX proteins, SNX13, SNX14, SNX19, and SNX25, confer differential phosphoinositide binding preferences. Although SNX13 and SNX19 PX domains bind the early endosomal lipid phosphatidylinositol 3-phosphate, SNX14 shows no membrane binding at all. Crystal structures of the SNX19 and SNX14 PX domains reveal key differences, with alterations in SNX14 leading to closure of the binding pocket to prevent phosphoinositide association. Our findings suggest a role for alternative membrane interactions in spatial control of RGS-PX proteins in cell signaling and trafficking.


    Organizational Affiliation

    From the Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia b.collins@imb.uq.edu.au.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MKIAA0254 proteinA, B137Mus musculusMutation(s): 0 
Gene Names: Snx19mKIAA0254Kiaa0254
UniProt & NIH Common Fund Data Resources
Find proteins for Q6P4T1 (Mus musculus)
Explore Q6P4T1 
Go to UniProtKB:  Q6P4T1
IMPC:  MGI:1921581
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6P4T1
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.90 Å
  • R-Value Free: 0.247 
  • R-Value Work: 0.211 
  • R-Value Observed: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 63.84α = 90
b = 32.938β = 107.52
c = 81.966γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Australian Research Council (ARC)AustraliaFT100100027
Australian Research Council (ARC)AustraliaDP0985029

Revision History  (Full details and data files)

  • Version 1.0: 2014-09-03
    Type: Initial release
  • Version 1.1: 2014-10-22
    Changes: Database references
  • Version 1.2: 2015-02-04
    Changes: Derived calculations
  • Version 1.3: 2018-01-17
    Changes: Author supporting evidence, Data collection, Database references, Derived calculations, Other, Source and taxonomy
  • Version 1.4: 2020-01-01
    Changes: Author supporting evidence