6SFR

SOS1 in Complex with Inhibitor BI-68BS


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.92 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 


This is version 1.2 of the entry. See complete history


Literature

BI-3406, a Potent and Selective SOS1-KRAS Interaction Inhibitor, Is Effective in KRAS-Driven Cancers through Combined MEK Inhibition.

Hofmann, M.H.Gmachl, M.Ramharter, J.Savarese, F.Gerlach, D.Marszalek, J.R.Sanderson, M.P.Kessler, D.Trapani, F.Arnhof, H.Rumpel, K.Botesteanu, D.A.Ettmayer, P.Gerstberger, T.Kofink, C.Wunberg, T.Zoephel, A.Fu, S.C.Teh, J.L.Bottcher, J.Pototschnig, N.Schachinger, F.Schipany, K.Lieb, S.Vellano, C.P.O'Connell, J.C.Mendes, R.L.Moll, J.Petronczki, M.Heffernan, T.P.Pearson, M.McConnell, D.B.Kraut, N.

(2021) Cancer Discov 11: 142-157

  • DOI: https://doi.org/10.1158/2159-8290.CD-20-0142
  • Primary Citation of Related Structures:  
    6SCM, 6SFR

  • PubMed Abstract: 

    KRAS is the most frequently mutated driver of pancreatic, colorectal, and non-small cell lung cancers. Direct KRAS blockade has proved challenging, and inhibition of a key downstream effector pathway, the RAF-MEK-ERK cascade, has shown limited success because of activation of feedback networks that keep the pathway in check. We hypothesized that inhibiting SOS1, a KRAS activator and important feedback node, represents an effective approach to treat KRAS-driven cancers. We report the discovery of a highly potent, selective, and orally bioavailable small-molecule SOS1 inhibitor, BI-3406, that binds to the catalytic domain of SOS1, thereby preventing the interaction with KRAS. BI-3406 reduces formation of GTP-loaded RAS and limits cellular proliferation of a broad range of KRAS-driven cancers. Importantly, BI-3406 attenuates feedback reactivation induced by MEK inhibitors and thereby enhances sensitivity of KRAS-dependent cancers to MEK inhibition. Combined SOS1 and MEK inhibition represents a novel and effective therapeutic concept to address KRAS-driven tumors. SIGNIFICANCE: To date, there are no effective targeted pan-KRAS therapies. In-depth characterization of BI-3406 activity and identification of MEK inhibitors as effective combination partners provide an attractive therapeutic concept for the majority of KRAS-mutant cancers, including those fueled by the most prevalent mutant KRAS oncoproteins, G12D, G12V, G12C, and G13D. See related commentary by Zhao et al., p. 17 . This article is highlighted in the In This Issue feature, p. 1 .


  • Organizational Affiliation

    Boehringer Ingelheim RCV GmbH & Co KG, Vienna, Austria. marco.hofmann@boehringer-ingelheim.com norbert.kraut@boehringer-ingelheim.com.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Son of sevenless homolog 1
A, B
487Homo sapiensMutation(s): 0 
Gene Names: SOS1
UniProt & NIH Common Fund Data Resources
Find proteins for Q07889 (Homo sapiens)
Explore Q07889 
Go to UniProtKB:  Q07889
PHAROS:  Q07889
GTEx:  ENSG00000115904 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ07889
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.92 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 84α = 90
b = 39.292β = 90.03
c = 176.494γ = 90
Software Package:
Software NamePurpose
BUSTERrefinement
XDSdata reduction
autoPROCdata scaling
Aimlessdata scaling
PHASERphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2020-08-26
    Type: Initial release
  • Version 1.1: 2021-03-10
    Changes: Database references
  • Version 1.2: 2021-06-02
    Changes: Database references