KRAS mutant-D33E in GDP-bound

Experimental Data Snapshot

  • Resolution: 2.54 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.194 

Starting Model: experimental
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KRAS Switch Mutants D33E and A59G Crystallize in the State 1 Conformation.

Lu, J.Bera, A.K.Gondi, S.Westover, K.D.

(2018) Biochemistry 57: 324-333

  • DOI: https://doi.org/10.1021/acs.biochem.7b00974
  • Primary Citation of Related Structures:  
    6ASA, 6ASE, 6BP1

  • PubMed Abstract: 

    KRAS switch loop movements play a crucial role in regulating RAS signaling, and alteration of these sensitive dynamics is a principal mechanism through which disease-associated RAS mutations lead to aberrant RAS activation. Prior studies suggest that despite a high degree of sequence similarity, the switches in KRAS are more dynamic than those in HRAS. We determined X-ray crystal structures of the rare tumorigenic KRAS mutants KRAS D33E , in switch 1 (SW1), and KRAS A59G , in switch 2 (SW2), bound to GDP and found these adopt nearly identical, open SW1 conformations as well as altered SW2 conformations. KRAS A59G bound to a GTP analogue crystallizes in the same conformation. This open conformation is consistent with the inactive "state 1" previously observed for HRAS bound to GTP. For KRAS A59G , switch rearrangements may be regulated by increased flexibility in the 57 DXXGQ 61 motif at codon 59. However, loss of interactions between side chains at codons 33 and 35 in the SW1 33 DPT 35 motif drives changes for KRAS D33E . The 33 DPT 35 motif is conserved for multiple members of the RAS subfamily but is not found in RAB, RHO, ARF, or Gα families, suggesting that dynamics mediated by this motif may be important for determining the selectivity of RAS-effector interactions. Biochemically, the consequence of altered switch dynamics is the same, showing impaired interaction with the guanine exchange factor SOS and loss of GAP-dependent GTPase activity. However, interactions with the RBD of RAF are preserved. Overall, these observations add to a body of evidence suggesting that HRAS and KRAS show meaningful differences in functionality stemming from differential protein dynamics independent of the hypervariable region.

  • Organizational Affiliation

    Departments of Biochemistry and Radiation Oncology, The University of Texas Southwestern Medical Center at Dallas , Dallas, Texas 75390, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GTPase KRas168Homo sapiensMutation(s): 1 
UniProt & NIH Common Fund Data Resources
Find proteins for P01116 (Homo sapiens)
Explore P01116 
Go to UniProtKB:  P01116
GTEx:  ENSG00000133703 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP01116
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on GDP

Download Ideal Coordinates CCD File 
C10 H15 N5 O11 P2
Query on MG

Download Ideal Coordinates CCD File 
Experimental Data & Validation

Experimental Data

  • Resolution: 2.54 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.186 
  • R-Value Observed: 0.194 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 34.527α = 90
b = 47.075β = 90
c = 90.765γ = 90
Software Package:
Software NamePurpose
HKL-2000data scaling
PDB_EXTRACTdata extraction
HKL-3000data reduction

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-24
    Type: Initial release
  • Version 1.1: 2018-02-07
    Changes: Database references
  • Version 1.2: 2023-10-04
    Changes: Data collection, Database references, Derived calculations, Refinement description