8ELR

HRAS R97F Crystal Form 2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.188 

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Literature

Allosteric site variants affect GTP hydrolysis on Ras.

Johnson, C.W.Fetics, S.K.Davis, K.P.Rodrigues, J.A.Mattos, C.

(2023) Protein Sci 32: e4767-e4767

  • DOI: https://doi.org/10.1002/pro.4767
  • Primary Citation of Related Structures:  
    8ELK, 8ELR, 8ELS, 8ELT, 8ELU, 8ELV, 8ELW, 8ELX, 8ELY, 8ELZ, 8EM0, 8FG3, 8FG4

  • PubMed Abstract: 

    RAS GTPases are proto-oncoproteins that regulate cell growth, proliferation, and differentiation in response to extracellular signals. The signaling functions of RAS, and other small GTPases, are dependent on their ability to cycle between GDP-bound and GTP-bound states. Structural analyses suggest that GTP hydrolysis catalyzed by HRAS can be regulated by an allosteric site located between helices 3, 4, and loop 7. Here we explore the relationship between intrinsic GTP hydrolysis on HRAS and the position of helix 3 and loop 7 through manipulation of the allosteric site, showing that the two sites are functionally connected. We generated several hydrophobic mutations in the allosteric site of HRAS to promote shifts in helix 3 relative to helix 4. By combining crystallography and enzymology to study these mutants, we show that closure of the allosteric site correlates with increased hydrolysis of GTP on HRAS in solution. Interestingly, binding to the RAS binding domain of RAF kinase (RAF-RBD) inhibits GTP hydrolysis in the mutants. This behavior may be representative of a cluster of mutations found in human tumors, which potentially cooperate with RAF complex formation to stabilize the GTP-bound state of RAS.


  • Organizational Affiliation

    Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GTPase HRas189Homo sapiensMutation(s): 1 
Gene Names: HRASHRAS1
EC: 3.6.5.2
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: 2.05 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.188 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.258α = 90
b = 39.258β = 90
c = 157.984γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data scaling
PDB_EXTRACTdata extraction
HKL-3000data reduction
PHENIXphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesMCB-1244203

Revision History  (Full details and data files)

  • Version 1.0: 2023-09-06
    Type: Initial release
  • Version 1.1: 2023-10-04
    Changes: Database references