GTPase HRAS under 500 MPa pressure

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 

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Equilibria between conformational states of the Ras oncogene protein revealed by high pressure crystallography.

Girard, E.Lopes, P.Spoerner, M.Dhaussy, A.C.Prange, T.Kalbitzer, H.R.Colloc'h, N.

(2022) Chem Sci 13: 2001-2010

  • DOI: https://doi.org/10.1039/d1sc05488k
  • Primary Citation of Related Structures:  
    7OG9, 7OGA, 7OGB, 7OGC, 7OGD, 7OGE, 7OGF

  • PubMed Abstract: 

    In this work, we experimentally investigate the allosteric transitions between conformational states on the Ras oncogene protein using high pressure crystallography. Ras protein is a small GTPase involved in central regulatory processes occurring in multiple conformational states. Ras acts as a molecular switch between active GTP-bound, and inactive GDP-bound states, controlling essential signal transduction pathways. An allosteric network of interactions between the effector binding regions and the membrane interacting regions is involved in Ras cycling. The conformational states which coexist simultaneously in solution possess higher Gibbs free energy than the ground state. Equilibria between these states can be shifted by applying pressure favouring conformations with lower partial molar volume, and has been previously analyzed by high-pressure NMR spectroscopy. High-pressure macromolecular crystallography (HPMX) is a powerful tool perfectly complementary to high-pressure NMR, allowing characterization at the molecular level with a high resolution the different allosteric states involved in the Ras cycling. We observe a transition above 300 MPa in the crystal leading to more stable conformers. Thus, we compare the crystallographic structures of Ras(wt)·Mg 2+ ·GppNHp and Ras(D33K)·Mg 2+ ·GppNHp at various high hydrostatic pressures. This gives insight into per-residue descriptions of the structural plasticity involved in allosteric equilibria between conformers. We have mapped out at atomic resolution the different segments of Ras protein which remain in the ground-state conformation or undergo structural changes, adopting excited-energy conformations corresponding to transient intermediate states. Such in crystallo phase transitions induced by pressure open the possibility to finely explore the structural determinants related to switching between Ras allosteric sub-states without any mutations nor exogenous partners.

  • Organizational Affiliation

    Univ. Grenoble Alpes, CEA, CNRS, IBS Grenoble France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GTPase HRas166Homo sapiensMutation(s): 0 
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
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.177 
  • R-Value Observed: 0.180 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.635α = 90
b = 38.635β = 90
c = 166.141γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2022-02-09
    Type: Initial release
  • Version 1.1: 2022-04-06
    Changes: Database references
  • Version 1.2: 2024-01-31
    Changes: Data collection, Refinement description