The structure of RalF

Experimental Data Snapshot

  • Resolution: 1.41 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.202 

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This is version 1.3 of the entry. See complete history


The structure of RalF, an ADP-ribosylation factor guanine nucleotide exchange factor from Legionella pneumophila, reveals the presence of a cap over the active site

Amor, J.C.Swails, J.Zhu, X.Roy, C.R.Nagai, H.Ingmundson, A.Cheng, X.Kahn, R.A.

(2005) J Biol Chem 280: 1392-1400

  • DOI: https://doi.org/10.1074/jbc.M410820200
  • Primary Citation of Related Structures:  
    1XSZ, 1XT0

  • PubMed Abstract: 

    The Legionella pneumophila protein RalF is secreted into host cytosol via the Dot/Icm type IV transporter where it acts to recruit ADP-ribosylation factor (Arf) to pathogen-containing phagosomes in the establishment of a replicative organelle. The presence in RalF of the Sec7 domain, present in all Arf guanine nucleotide exchange factors, has suggested that recruitment of Arf is an early step in pathogenesis. We have determined the crystal structure of RalF and of the isolated Sec7 domain and found that RalF is made up of two domains. The Sec7 domain is homologous to mammalian Sec7 domains. The C-terminal domain forms a cap over the active site in the Sec7 domain and contains a conserved folding motif, previously observed in adaptor subunits of vesicle coat complexes. The importance of the capping domain and of the glutamate in the "glutamic finger," conserved in all Sec7 domains, to RalF functions was examined using three different assays. These data highlight the functional importance of domains other than Sec7 in Arf guanine nucleotide exchange factors to biological activities and suggest novel mechanisms of regulation of those activities.

  • Organizational Affiliation

    Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
guanine nucleotide exchange protein
A, B
356Legionella pneumophilaMutation(s): 0 
Find proteins for Q8RT31 (Legionella pneumophila)
Explore Q8RT31 
Go to UniProtKB:  Q8RT31
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ8RT31
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.41 Å
  • R-Value Free: 0.225 
  • R-Value Work: 0.202 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84.559α = 90
b = 84.559β = 90
c = 110.175γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
HKL-2000data reduction

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-11-02
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references