1WER

RAS-GTPASE-ACTIVATING DOMAIN OF HUMAN P120GAP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.271 
  • R-Value Work: 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

  • 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 slo ...

    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: 
    • 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
    • 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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
P120GAP
A
334Homo sapiensMutation(s): 0 
Gene Names: RASA1 (GAP, RASA)
Find proteins for P20936 (Homo sapiens)
Go to Gene View: RASA1
Go to UniProtKB:  P20936
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.221 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 42.200α = 90.00
b = 55.600β = 90.00
c = 142.200γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
XSCALEdata scaling
X-PLORmodel building
XDSdata reduction
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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