Experimental Data Snapshot

  • Resolution: 2.00 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.182 

wwPDB Validation   3D Report Full Report

This is version 1.4 of the entry. See complete history


Structure of the Sec7 domain of the Arf exchange factor ARNO.

Cherfils, J.Menetrey, J.Mathieu, M.Le Bras, G.Robineau, S.Beraud-Dufour, S.Antonny, B.Chardin, P.

(1998) Nature 392: 101-105

  • DOI: https://doi.org/10.1038/32210
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Small G proteins switch from a resting, GDP-bound state to an active, GTP-bound state. As spontaneous GDP release is slow, guanine-nucleotide-exchange factors (GEFs) are required to promote fast activation of small G proteins through replacement of GDP with GTP in vivo. Families of GEFs with no sequence similarity to other GEF families have now been assigned to most families of small G proteins. In the case of the small G protein Arf1, the exchange of bound GDP for GTP promotes the coating of secretory vesicles in Golgi traffic. An exchange factor for human Arf1, ARNO, and two closely related proteins, named cytohesin 1 and GPS1, have been identified. These three proteins are modular proteins with an amino-terminal coiled-coil, a central Sec7-like domain and a carboxy-terminal pleckstrin homology domain. The Sec7 domain contains the exchange-factor activity. It was first found in Sec7, a yeast protein involved in secretion, and is present in several other proteins, including the yeast exchange factors for Arf, Geal and Gea2. Here we report the crystal structure of the Sec7 domain of human ARNO at 2 A resolution and the identification of the site of interaction of ARNO with Arf.

  • Organizational Affiliation

    Laboratoire d'Enzymologie et Biochimie Structurales, CNRS UPR 9063, Gif-sur-Yvette, France. cherfils@lebs.cnrs-gif.fr

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ARNO195Homo sapiensMutation(s): 0 
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.00 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.182 
  • R-Value Observed: 0.182 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 89.766α = 90
b = 89.766β = 90
c = 89.766γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1999-03-09
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2018-04-04
    Changes: Data collection
  • Version 1.4: 2024-02-14
    Changes: Data collection, Database references