wild-type NRas bound to GppNHp

Experimental Data Snapshot

  • Resolution: 1.67 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.191 

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Ligand Structure Quality Assessment 

This is version 1.5 of the entry. See complete history


The small GTPases K-Ras, N-Ras, and H-Ras have distinct biochemical properties determined by allosteric effects.

Johnson, C.W.Reid, D.Parker, J.A.Salter, S.Knihtila, R.Kuzmic, P.Mattos, C.

(2017) J Biol Chem 292: 12981-12993

  • DOI: https://doi.org/10.1074/jbc.M117.778886
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    H-Ras, K-Ras, and N-Ras are small GTPases that are important in the control of cell proliferation, differentiation, and survival, and their mutants occur frequently in human cancers. The G-domain, which catalyzes GTP hydrolysis and mediates downstream signaling, is 95% conserved between the Ras isoforms. Because of their very high sequence identity, biochemical studies done on H-Ras have been considered representative of all three Ras proteins. We show here that this is not a valid assumption. Using enzyme kinetic assays under identical conditions, we observed clear differences between the three isoforms in intrinsic catalysis of GTP by Ras in the absence and presence of the Ras-binding domain (RBD) of the c-Raf kinase protein (Raf-RBD). Given their identical active sites, isoform G-domain differences must be allosteric in origin, due to remote isoform-specific residues that affect conformational states. We present the crystal structure of N-Ras bound to a GTP analogue and interpret the kinetic data in terms of structural features specific for H-, K-, and N-Ras.

  • Organizational Affiliation

    Department of Chemistry and Chemical Biology, Northeastern University, Boston, Massachusetts 02115. Electronic address: c.mattos@northeastern.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GTPase NRas166Homo sapiensMutation(s): 0 
Gene Names: NRASHRAS1
UniProt & NIH Common Fund Data Resources
Find proteins for P01111 (Homo sapiens)
Explore P01111 
Go to UniProtKB:  P01111
PHAROS:  P01111
GTEx:  ENSG00000213281 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01111
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.67 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.191 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.007α = 90
b = 39.007β = 90
c = 159.175γ = 120
Software Package:
Software NamePurpose

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 States--

Revision History  (Full details and data files)

  • Version 1.0: 2017-06-28
    Type: Initial release
  • Version 1.1: 2017-07-05
    Changes: Database references
  • Version 1.2: 2017-08-16
    Changes: Database references
  • Version 1.3: 2017-09-27
    Changes: Author supporting evidence
  • Version 1.4: 2019-11-27
    Changes: Author supporting evidence
  • Version 1.5: 2023-10-04
    Changes: Data collection, Database references, Refinement description