3T06

Crystal Structure of the DH/PH fragment of PDZRHOGEF with N-terminal regulatory elements in complex with Human RhoA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.84 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.208 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Insights into the Molecular Activation Mechanism of the RhoA-specific Guanine Nucleotide Exchange Factor, PDZRhoGEF.

Bielnicki, J.A.Shkumatov, A.V.Derewenda, U.Somlyo, A.V.Svergun, D.I.Derewenda, Z.S.

(2011) J.Biol.Chem. 286: 35163-35175

  • DOI: 10.1074/jbc.M111.270918

  • PubMed Abstract: 
  • PDZRhoGEF (PRG) belongs to a small family of RhoA-specific nucleotide exchange factors that mediates signaling through select G-protein-coupled receptors via Gα(12/13) and activates RhoA by catalyzing the exchange of GDP to GTP. PRG is a multidomain ...

    PDZRhoGEF (PRG) belongs to a small family of RhoA-specific nucleotide exchange factors that mediates signaling through select G-protein-coupled receptors via Gα(12/13) and activates RhoA by catalyzing the exchange of GDP to GTP. PRG is a multidomain protein composed of PDZ, regulators of G-protein signaling-like (RGSL), Dbl-homology (DH), and pleckstrin-homology (PH) domains. It is autoinhibited in cytosol and is believed to undergo a conformational rearrangement and translocation to the membrane for full activation, although the molecular details of the regulation mechanism are not clear. It has been shown recently that the main autoregulatory elements of PDZRhoGEF, the autoinhibitory "activation box" and the "GEF switch," which is required for full activation, are located directly upstream of the catalytic DH domain and its RhoA binding surface, emphasizing the functional role of the RGSL-DH linker. Here, using a combination of biophysical and biochemical methods, we show that the mechanism of PRG regulation is yet more complex and may involve an additional autoinhibitory element in the form of a molten globule region within the linker between RGSL and DH domains. We propose a novel, two-tier model of autoinhibition where the activation box and the molten globule region act synergistically to impair the ability of RhoA to bind to the catalytic DH-PH tandem. The molten globule region and the activation box become less ordered in the PRG-RhoA complex and dissociate from the RhoA-binding site, which may constitute a critical step leading to PRG activation.


    Organizational Affiliation

    Department of Molecular Physiology and Biological Physics University of Virginia, Charlottesville, Virginia 22908, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Rho guanine nucleotide exchange factor 11
A, E
418Homo sapiensMutation(s): 0 
Gene Names: ARHGEF11 (KIAA0380)
Find proteins for O15085 (Homo sapiens)
Go to Gene View: ARHGEF11
Go to UniProtKB:  O15085
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Transforming protein RhoA
B, F
178Homo sapiensMutation(s): 1 
Gene Names: RHOA (ARH12, ARHA, RHO12)
Find proteins for P61586 (Homo sapiens)
Go to Gene View: RHOA
Go to UniProtKB:  P61586
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.84 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.208 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 84.370α = 90.00
b = 118.630β = 113.61
c = 92.443γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data collection
BALBESphasing
DENZOdata reduction
HKL-2000data scaling
SCALEPACKdata scaling
PDB_EXTRACTdata extraction
HKL-2000data reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-08-03
    Type: Initial release
  • Version 1.1: 2011-08-17
    Type: Database references
  • Version 1.2: 2011-10-19
    Type: Database references
  • Version 1.3: 2017-11-08
    Type: Refinement description