1R8Q

FULL-LENGTH ARF1-GDP-MG IN COMPLEX WITH BREFELDIN A AND A SEC7 DOMAIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 

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Ligand Structure Quality Assessment 


This is version 1.5 of the entry. See complete history


Literature

Structural snapshots of the mechanism and inhibition of a guanine nucleotide exchange factor

Renault, L.Guibert, B.Cherfils, J.

(2003) Nature 426: 525-530

  • DOI: https://doi.org/10.1038/nature02197
  • Primary Citation of Related Structures:  
    1R8M, 1R8Q, 1R8S, 1S9D

  • PubMed Abstract: 

    Small GTP-binding (G) proteins are activated by GDP/GTP nucleotide exchange stimulated by guanine nucleotide exchange factors (GEFs). Nucleotide dissociation from small G protein-GEF complexes involves transient GDP-bound intermediates whose structures have never been described. In the case of Arf proteins, small G proteins that regulate membrane traffic in eukaryotic cells, such intermediates can be trapped either by the natural inhibitor brefeldin A or by charge reversal at the catalytic glutamate of the Sec7 domain of their GEFs. Here we report the crystal structures of these intermediates that show that membrane recruitment of Arf and nucleotide dissociation are separate reactions stimulated by Sec7. The reactions proceed through sequential rotations of the Arf.GDP core towards the Sec7 catalytic site, and are blocked by interfacial binding of brefeldin A and unproductive stabilization of GDP by charge reversal. The structural characteristics of the reaction and its modes of inhibition reveal unexplored ways in which to inhibit the activation of small G proteins.


  • Organizational Affiliation

    Laboratoire d'Enzymologie et Biochimie Structurales, CNRS UPR 9063, Avenue de la Terrasse, 91198 Gif sur Yvette, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ADP-ribosylation factor 1A,
C [auth B]
181Bos taurusMutation(s): 0 
Gene Names: ARF1
EC: 3.6.5.2
UniProt
Find proteins for P84080 (Bos taurus)
Explore P84080 
Go to UniProtKB:  P84080
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP84080
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
ArnoB [auth E],
D [auth F]
203Homo sapiensMutation(s): 4 
Gene Names: PSCD2ARNO
UniProt & NIH Common Fund Data Resources
Find proteins for Q99418 (Homo sapiens)
Explore Q99418 
Go to UniProtKB:  Q99418
PHAROS:  Q99418
GTEx:  ENSG00000105443 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ99418
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
G3D
Query on G3D

Download Ideal Coordinates CCD File 
F [auth A],
J [auth B]
GUANOSINE-3'-MONOPHOSPHATE-5'-DIPHOSPHATE
C10 H16 N5 O14 P3
HEYSFDAMRDTCJM-UUOKFMHZSA-N
AFB
Query on AFB

Download Ideal Coordinates CCD File 
G [auth A],
K [auth B]
1,6,7,8,9,11A,12,13,14,14A-DECAHYDRO-1,13-DIHYDROXY-6-METHYL-4H-CYCLOPENT[F]OXACYCLOTRIDECIN-4-ONE
C16 H24 O4
KQNZDYYTLMIZCT-KQPMLPITSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
H [auth E]ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
E [auth A],
I [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.86 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.181 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.081α = 90
b = 109.773β = 90
c = 118.326γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MAR345data collection
XDSdata scaling
CCP4phasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-01-20
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Advisory, Version format compliance
  • Version 1.3: 2017-10-11
    Changes: Refinement description
  • Version 1.4: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.5: 2024-02-14
    Changes: Data collection