5V6V

Crystal structure of small molecule aziridine 3 covalently bound to K-Ras G12C


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 

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Ligand Structure Quality Assessment 


This is version 1.3 of the entry. See complete history


Literature

Expanding the Scope of Electrophiles Capable of Targeting K-Ras Oncogenes.

McGregor, L.M.Jenkins, M.L.Kerwin, C.Burke, J.E.Shokat, K.M.

(2017) Biochemistry 56: 3178-3183

  • DOI: https://doi.org/10.1021/acs.biochem.7b00271
  • Primary Citation of Related Structures:  
    5V6S, 5V6V

  • PubMed Abstract: 

    There is growing interest in reversible and irreversible covalent inhibitors that target noncatalytic amino acids in target proteins. With a goal of targeting oncogenic K-Ras variants (e.g., G12D) by expanding the types of amino acids that can be targeted by covalent inhibitors, we survey a set of electrophiles for their ability to label carboxylates. We functionalized an optimized ligand for the K-Ras switch II pocket with a set of electrophiles previously reported to react with carboxylates and characterized the ability of these compounds to react with model nucleophiles and oncogenic K-Ras proteins. Here, we report that aziridines and stabilized diazo groups preferentially react with free carboxylates over thiols. Although we did not identify a warhead that potently labels K-Ras G12D, we were able to study the interactions of many electrophiles with K-Ras, as most of the electrophiles rapidly label K-Ras G12C. We characterized the resulting complexes by crystallography, hydrogen/deuterium exchange, and differential scanning fluorimetry. Our results both demonstrate the ability of a noncatalytic cysteine to react with a diverse set of electrophiles and emphasize the importance of proper spatial arrangements between a covalent inhibitor and its intended nucleophile. We hope that these results can expand the range of electrophiles and nucleophiles of use in covalent protein modulation.


  • Organizational Affiliation

    Department of Biochemistry and Microbiology, University of Victoria , Victoria, BC V8W 2Y2, Canada.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GTPase KRas
A, B
170Homo sapiensMutation(s): 4 
Gene Names: KRASKRAS2RASK2
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
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
8YA
Query on 8YA

Download Ideal Coordinates CCD File 
F [auth A],
M [auth B]
3-amino-1-{4-[6-chloro-8-fluoro-7-(5-methyl-1H-indazol-4-yl)quinazolin-4-yl]piperazin-1-yl}propan-1-one
C23 H23 Cl F N7 O
VJDYKBMYNVLSKK-UHFFFAOYSA-N
GDP
Query on GDP

Download Ideal Coordinates CCD File 
C [auth A],
H [auth B]
GUANOSINE-5'-DIPHOSPHATE
C10 H15 N5 O11 P2
QGWNDRXFNXRZMB-UUOKFMHZSA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
L [auth B]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
D [auth A]
E [auth A]
G [auth B]
I [auth B]
J [auth B]
D [auth A],
E [auth A],
G [auth B],
I [auth B],
J [auth B],
K [auth B]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.72 Å
  • R-Value Free: 0.202 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.23α = 77.34
b = 39.17β = 81.44
c = 62.34γ = 76.86
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
iMOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United States5R01CA190408
Howard Hughes Medical Institute (HHMI)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: 2017-09-20
    Changes: Author supporting evidence
  • Version 1.3: 2019-11-20
    Changes: Author supporting evidence