4US0

The crystal structure of H-Ras and SOS in complex with ligands


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.186 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Small Molecule Binding Sites on the Ras:SOS Complex Can be Exploited for Inhibition of Ras Activation.

Winter, J.Anderson, M.Blades, K.Chresta, C.Embrey, K.J.Fairley, G.Faulder, P.Finlay, M.R.V.Kettle, J.G.Nowak, T.Overman, R.Patel, S.J.Perkins, P.Spadola, L.Tart, J.Tucker, J.A.Wrigley, G.

(2015) J.Med.Chem. 58: 2265

  • DOI: 10.1021/jm501660t
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Constitutively active mutant KRas displays a reduced rate of GTP hydrolysis via both intrinsic and GTPase-activating protein-catalyzed mechanisms, resulting in the perpetual activation of Ras pathways. We describe a fragment screening campaign using ...

    Constitutively active mutant KRas displays a reduced rate of GTP hydrolysis via both intrinsic and GTPase-activating protein-catalyzed mechanisms, resulting in the perpetual activation of Ras pathways. We describe a fragment screening campaign using X-ray crystallography that led to the discovery of three fragment binding sites on the Ras:SOS complex. The identification of tool compounds binding at each of these sites allowed exploration of two new approaches to Ras pathway inhibition by stabilizing or covalently modifying the Ras:SOS complex to prevent the reloading of Ras with GTP. Initially, we identified ligands that bound reversibly to the Ras:SOS complex in two distinct sites, but these compounds were not sufficiently potent inhibitors to validate our stabilization hypothesis. We conclude by demonstrating that covalent modification of Cys118 on Ras leads to a novel mechanism of inhibition of the SOS-mediated interaction between Ras and Raf and is effective at inhibiting the exchange of labeled GDP in both mutant (G12C and G12V) and wild type Ras.


    Organizational Affiliation

    AstraZeneca , Alderley Park, Macclesfield, Cheshire, SK10 4TG, United Kingdom.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GTPASE HRAS
R
185Homo sapiensMutation(s): 0 
Gene Names: HRAS (HRAS1)
Find proteins for P01112 (Homo sapiens)
Go to Gene View: HRAS
Go to UniProtKB:  P01112
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
SON OF SEVENLESS HOMOLOG 1
S
487Homo sapiensMutation(s): 0 
Gene Names: SOS1
Find proteins for Q07889 (Homo sapiens)
Go to Gene View: SOS1
Go to UniProtKB:  Q07889
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NEQ
Query on NEQ

Download SDF File 
Download CCD File 
R
N-ETHYLMALEIMIDE
C6 H7 N O2
HDFGOPSGAURCEO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.17 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.186 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 149.217α = 90.00
b = 149.217β = 90.00
c = 201.038γ = 90.00
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2015-03-04
    Type: Initial release
  • Version 1.1: 2015-03-25
    Type: Database references
  • Version 1.2: 2015-09-23
    Type: Data collection
  • Version 1.3: 2016-01-13
    Type: Data collection