4GOK

The Crystal structure of Arl2GppNHp in complex with UNC119a


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.245 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for Arl3-specific release of myristoylated ciliary cargo from UNC119.

Ismail, S.A.Chen, Y.X.Miertzschke, M.Vetter, I.R.Koerner, C.Wittinghofer, A.

(2012) Embo J. 31: 4085-4094

  • DOI: 10.1038/emboj.2012.257
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Access to the ciliary membrane for trans-membrane or membrane-associated proteins is a regulated process. Previously, we have shown that the closely homologous small G proteins Arl2 and Arl3 allosterically regulate prenylated cargo release from PDEδ. ...

    Access to the ciliary membrane for trans-membrane or membrane-associated proteins is a regulated process. Previously, we have shown that the closely homologous small G proteins Arl2 and Arl3 allosterically regulate prenylated cargo release from PDEδ. UNC119/HRG4 is responsible for ciliary delivery of myristoylated cargo. Here, we show that although Arl3 and Arl2 bind UNC119 with similar affinities, only Arl3 allosterically displaces cargo by accelerating its release by three orders of magnitude. Crystal structures of Arl3 and Arl2 in complex with UNC119a reveal the molecular basis of specificity. Contrary to previous structures of GTP-bound Arf subfamily proteins, the N-terminal amphipathic helix of Arl3·GppNHp is not displaced by the interswitch toggle but remains bound on the surface of the protein. Opposite to the mechanism of cargo release on PDEδ, this induces a widening of the myristoyl binding pocket. This leads us to propose that ciliary targeting of myristoylated proteins is not only dependent on nucleotide status but also on the cellular localization of Arl3.


    Organizational Affiliation

    Structural Biology Group, Max Planck Institut für Molekulare Physiologie, Dortmund, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ADP-ribosylation factor-like protein 2
B, A
169Mus musculusMutation(s): 1 
Gene Names: Arl2
Find proteins for Q9D0J4 (Mus musculus)
Go to UniProtKB:  Q9D0J4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein unc-119 homolog A
G, C
240Homo sapiensMutation(s): 0 
Gene Names: UNC119 (RG4)
Find proteins for Q13432 (Homo sapiens)
Go to Gene View: UNC119
Go to UniProtKB:  Q13432
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
GNP
Query on GNP

Download SDF File 
Download CCD File 
A, B
PHOSPHOAMINOPHOSPHONIC ACID-GUANYLATE ESTER
C10 H17 N6 O13 P3
UQABYHGXWYXDTK-UUOKFMHZSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.297 
  • R-Value Work: 0.245 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 101.450α = 90.00
b = 61.080β = 101.33
c = 143.620γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
MOLREPphasing
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-09-19
    Type: Initial release
  • Version 1.1: 2012-10-31
    Type: Database references