3N5C

Crystal Structure of Arf6DELTA13 complexed with GDP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.171 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

SAXS and X-ray crystallography suggest an unfolding model for the GDP/GTP conformational switch of the small GTPase Arf6.

Biou, V.Aizel, K.Roblin, P.Thureau, A.Jacquet, E.Hansson, S.Guibert, B.Guittet, E.van Heijenoort, C.Zeghouf, M.Perez, J.Cherfils, J.

(2010) J.Mol.Biol. 402: 696-707

  • DOI: 10.1016/j.jmb.2010.08.002

  • PubMed Abstract: 
  • The small GTPases Arf1 and Arf6 have nonoverlapping functions in cellular traffic despite their very high sequence and structural resemblance. Notably, the exquisite isoform specificity of their guanine nucleotide exchange factors and their distincti ...

    The small GTPases Arf1 and Arf6 have nonoverlapping functions in cellular traffic despite their very high sequence and structural resemblance. Notably, the exquisite isoform specificity of their guanine nucleotide exchange factors and their distinctive sensitivity to the drug brefeldin A cannot be explained by any straightforward structural model. Here we integrated structural and spectroscopic methods to address this issue using Δ13Arf6-GDP, a truncated mutant that mimics membrane-bound Arf6-GDP. The crystal structure of Δ13Arf6-GDP reveals an unprecedented unfolding of the GTPase core β-strands, which is fully accounted for by small-angle X-ray scattering data in solution and by ab initio three-dimensional envelope calculation. NMR chemical shifts identify this structural disorder in Δ13Arf6-GDP, but not in the closely related Δ17Arf1-GDP, which is consistent with their comparative thermodynamic and hydrodynamic analyses. Taken together, these experiments suggest an unfolding model for the nucleotide switch of Arf6 and shed new light on its biochemical differences with Arf1.


    Organizational Affiliation

    Laboratoire d'Enzymologie et Biochimie Structurales, Centre de Recherche CNRS de Gif-Sur-Yvette, Gif-sur-Yvette, France. biou@lebs.cnrs-gif.fr




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ADP-ribosylation factor 6
A, B
162Homo sapiensMutation(s): 0 
Gene Names: ARF6
Find proteins for P62330 (Homo sapiens)
Go to Gene View: ARF6
Go to UniProtKB:  P62330
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GDP
Query on GDP

Download SDF File 
Download CCD File 
A, B
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.171 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 38.470α = 90.00
b = 49.720β = 90.00
c = 143.070γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XDSdata scaling
BUSTERrefinement
PHASERphasing
ADSCdata collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-08-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance