1WER

RAS-GTPASE-ACTIVATING DOMAIN OF HUMAN P120GAP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.221 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of the GTPase-activating domain of human p120GAP and implications for the interaction with Ras.

Scheffzek, K.Lautwein, A.Kabsch, W.Ahmadian, M.R.Wittinghofer, A.

(1996) Nature 384: 591-596

  • DOI: 10.1038/384591a0
  • Primary Citation of Related Structures:  
    1WER

  • PubMed Abstract: 
  • Ras-related GTP-binding proteins function as molecular switches which cycle between GTP-bound 'on'- and GDP-bound 'off'-states. GTP hydrolysis is the common timing mechanism that mediates the return from the 'on' to the 'off'-state. It is usually slow but can be accelerated by orders of magnitude upon interaction with GTPase-activating proteins (GAPs) ...

    Ras-related GTP-binding proteins function as molecular switches which cycle between GTP-bound 'on'- and GDP-bound 'off'-states. GTP hydrolysis is the common timing mechanism that mediates the return from the 'on' to the 'off'-state. It is usually slow but can be accelerated by orders of magnitude upon interaction with GTPase-activating proteins (GAPs). In the case of Ras, a major regulator of cellular growth, point mutations are found in approximately 30% of human tumours which render the protein unable to hydrolyse GTP, even in the presence of Ras-GAPs. The first structure determination of a GTPase-activating protein reveals the catalytically active fragment of the Ras-specific p120GAP (ref. 2), GAP-334, as an elongated, exclusively helical protein which appears to represent a novel protein fold. The molecule consists of two domains, one of which contains all the residues conserved among different GAPs for Ras. From the location of conserved residues around a shallow groove in the central domain we can identify the site of interaction with Ras x GTP. This leads to a model for the interaction between Ras and GAP that satisfies numerous biochemical and genetic data on this important regulatory process.


    Related Citations: 
    • Crystallization and Preliminary X-Ray Crystallographic Study of the Ras-Gtpase-Activating Domain of Human P120Gap
      Scheffzek, K., Lautwein, A., Scherer, A., Franken, S., Wittinghofer, A.
      (1997) Proteins 27: 315
    • Molecular Cloning of Two Types of Gap Complementary DNA from Human Placenta
      Trahey, M., Wong, G., Halenbeck, R., Rubinfeld, B., Martin, G.A., Ladner, M., Long, C.M., Crosier, W.J., Watt, K., Koths, K., Mccormick, F.
      (1988) Science 242: 1697
    • A Cytoplasmic Protein Stimulates Normal N-Ras P21 Gtpase, But Does not Affect Oncogenic Mutants
      Trahey, M., Mccormick, F.
      (1987) Science 238: 542

    Organizational Affiliation

    Max-Planck-Institut für molekulare Physiologie, Dortmund, Germany.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
P120GAP A334Homo sapiensMutation(s): 0 
Gene Names: GENE FRAGMENT OF P120GAPRASA1GAPRASA
Find proteins for P20936 (Homo sapiens)
Explore P20936 
Go to UniProtKB:  P20936
NIH Common Fund Data Resources
PHAROS:  P20936
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.60 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.221 
  • R-Value Observed: 0.221 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.2α = 90
b = 55.6β = 90
c = 142.2γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
XDSdata reduction
XSCALEdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1997-12-31
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance