1ZC3

Crystal structure of the Ral-binding domain of Exo84 in complex with the active RalA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Exo84 and Sec5 are competitive regulatory Sec6/8 effectors to the RalA GTPase.

Jin, R.Junutula, J.R.Matern, H.T.Ervin, K.E.Scheller, R.H.Brunger, A.T.

(2005) Embo J. 24: 2064-2074

  • DOI: 10.1038/sj.emboj.7600699
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The Sec6/8 complex, also known as the exocyst complex, is an octameric protein complex that has been implicated in tethering of secretory vesicles to specific regions on the plasma membrane. Two subunits of the Sec6/8 complex, Exo84 and Sec5, have re ...

    The Sec6/8 complex, also known as the exocyst complex, is an octameric protein complex that has been implicated in tethering of secretory vesicles to specific regions on the plasma membrane. Two subunits of the Sec6/8 complex, Exo84 and Sec5, have recently been shown to be effector targets for active Ral GTPases. However, the mechanism by which Ral proteins regulate the Sec6/8 activities remains unclear. Here, we present the crystal structure of the Ral-binding domain of Exo84 in complex with active RalA. The structure reveals that the Exo84 Ral-binding domain adopts a pleckstrin homology domain fold, and that RalA interacts with Exo84 via an extended interface that includes both switch regions. Key residues of Exo84 and RalA were found that determine the specificity of the complex interactions; these interactions were confirmed by mutagenesis binding studies. Structural and biochemical data show that Exo84 and Sec5 competitively bind to active RalA. Taken together, these results further strengthen the proposed role of RalA-regulated assembly of the Sec6/8 complex.


    Organizational Affiliation

    Howard Hughes Medical Institute, Stanford University, Stanford, CA 94305-5432, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Ras-related protein Ral-A
A, C
175Homo sapiensMutation(s): 1 
Gene Names: RALA (RAL)
Find proteins for P11233 (Homo sapiens)
Go to Gene View: RALA
Go to UniProtKB:  P11233
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
exocyst complex protein Exo84
B, D
113Rattus norvegicusMutation(s): 0 
Gene Names: Exoc8 (Exo84)
Find proteins for O54924 (Rattus norvegicus)
Go to UniProtKB:  O54924
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

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

Download SDF File 
Download CCD File 
A, C
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 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.206 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 52.469α = 90.00
b = 113.795β = 102.86
c = 71.012γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2005-06-14
    Type: Initial release
  • Version 1.1: 2008-04-30
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance