1ZW6

Crystal Structure of the GTP-bound form of RasQ61G


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.146 

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This is version 1.3 of the entry. See complete history


Literature

Structure of a transient intermediate for GTP hydrolysis by ras.

Ford, B.Hornak, V.Kleinman, H.Nassar, N.

(2006) Structure 14: 427-436

  • DOI: https://doi.org/10.1016/j.str.2005.12.010
  • Primary Citation of Related Structures:  
    1ZVQ, 1ZW6

  • PubMed Abstract: 

    The flexibility of the conserved 57DTAGQ61 motif is essential for Ras proper cycling in response to growth factors. Here, we increase the flexibility of the 57DTAGQ61 motif by mutating Gln61 to Gly. The crystal structure of the RasQ61G mutant reveals a new conformation of switch 2 that bears remarkable structural homology to an intermediate for GTP hydrolysis revealed by targeted molecular dynamics simulations. The mutation increased retention of GTP and inhibited Ras binding to the catalytic site, but not to the distal site of Sos. Most importantly, the thermodynamics of RafRBD binding to Ras are altered even though the structure of switch 1 is not affected by the mutation. Our results suggest that interplay and transmission of structural information between the switch regions are important factors for Ras function. They propose that initiation of GTP hydrolysis sets off the separation of the Ras/effector complex even before the GDP conformation is reached.


  • Organizational Affiliation

    Department of Physiology and Biophysics, Basic Sciences Tower, Stony Brook University, Stony Brook, New York 11794, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Transforming protein p21/H-Ras-1166Homo sapiensMutation(s): 2 
Gene Names: HRASHRAS1
UniProt & NIH Common Fund Data Resources
Find proteins for P01112 (Homo sapiens)
Explore P01112 
Go to UniProtKB:  P01112
PHAROS:  P01112
GTEx:  ENSG00000174775 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01112
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.50 Å
  • R-Value Free: 0.174 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.146 
  • Space Group: H 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 88.776α = 90
b = 88.776β = 90
c = 134.392γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data reduction
SCALEPACKdata scaling
SHELXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-03-14
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-20
    Changes: Database references, Derived calculations