1F7C

CRYSTAL STRUCTURE OF THE BH DOMAIN FROM GRAF, THE GTPASE REGULATOR ASSOCIATED WITH FOCAL ADHESION KINASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.205 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of the BH domain from graf and its implications for Rho GTPase recognition.

Longenecker, K.L.Zhang, B.Derewenda, U.Sheffield, P.J.Dauter, Z.Parsons, J.T.Zheng, Y.Derewenda, Z.S.

(2000) J.Biol.Chem. 275: 38605-38610

  • DOI: 10.1074/jbc.M007574200

  • PubMed Abstract: 
  • Cellular signaling by small G-proteins is down-regulated by GTPase-activating proteins (GAPs), which increase the rate of GTP hydrolysis. The GTPase regulator associated with focal adhesion kinase (Graf) exhibits GAP activity toward the RhoA and Cdc4 ...

    Cellular signaling by small G-proteins is down-regulated by GTPase-activating proteins (GAPs), which increase the rate of GTP hydrolysis. The GTPase regulator associated with focal adhesion kinase (Graf) exhibits GAP activity toward the RhoA and Cdc42 GTPases, but is only weakly active toward the closely related Rac1. We determined the crystal structure of a 231-residue fragment of Graf (GrafGAP), a domain containing the GAP activity, at 2.4-A resolution. The structure clarifies the boundaries of the functional domain and yields insight to the mechanism of substrate recognition. Modeling its interaction with substrate suggested that a favorable interaction with Glu-95 of Cdc42 (Glu-97 of RhoA) would be absent with the corresponding Ala-95 of Rac1. Indeed, GrafGAP activity is diminished approximately 40-fold toward a Cdc42 E95A mutant, whereas a approximately 10-fold increase is observed for a Rac1 A95E mutant. The GrafGAP epitope that apparently interacts with Glu-95(Glu-97) contains Asn-225, which was recently found mutated in some myeloid leukemia patients. We conclude that position 95 of the GTPase is an important determinant for GrafGAP specificity in cellular function and tumor suppression.


    Related Citations: 
    • Expression, purification and crystallization of a BH domain from the GTPase regulatory protein associated with focal adhesion kinase
      Sheffield, P.J.,Derewenda, U.,Taylor, J.,Parsons, T.J.,Derewenda, Z.S.
      (1999) Acta Crystallogr.,Sect.D 55: 356


    Organizational Affiliation

    Department of Molecular Physiology and Biological Physics and the Department of Microbiology, University of Virginia Health System, Charlottesville, Virginia 22908-0736, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RHOGAP PROTEIN
A
231Gallus gallusMutation(s): 0 
Gene Names: ARHGAP26 (GRAF)
Find proteins for Q5ZMW5 (Gallus gallus)
Go to Gene View: ARHGAP26
Go to UniProtKB:  Q5ZMW5
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.205 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 65.026α = 90.00
b = 65.026β = 90.00
c = 91.624γ = 120.00
Software Package:
Software NamePurpose
AMoREphasing
MLPHAREphasing
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2000-12-20
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description