4XV9

B-Raf Kinase domain in complex with PLX5568


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

RAF inhibitors that evade paradoxical MAPK pathway activation.

Zhang, C.Spevak, W.Zhang, Y.Burton, E.A.Ma, Y.Habets, G.Zhang, J.Lin, J.Ewing, T.Matusow, B.Tsang, G.Marimuthu, A.Cho, H.Wu, G.Wang, W.Fong, D.Nguyen, H.Shi, S.Womack, P.Nespi, M.Shellooe, R.Carias, H.Powell, B.Light, E.Sanftner, L.Walters, J.Tsai, J.West, B.L.Visor, G.Rezaei, H.Lin, P.S.Nolop, K.Ibrahim, P.N.Hirth, P.Bollag, G.

(2015) Nature 526: 583-586

  • DOI: 10.1038/nature14982
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Oncogenic activation of BRAF fuels cancer growth by constitutively promoting RAS-independent mitogen-activated protein kinase (MAPK) pathway signalling. Accordingly, RAF inhibitors have brought substantially improved personalized treatment of metasta ...

    Oncogenic activation of BRAF fuels cancer growth by constitutively promoting RAS-independent mitogen-activated protein kinase (MAPK) pathway signalling. Accordingly, RAF inhibitors have brought substantially improved personalized treatment of metastatic melanoma. However, these targeted agents have also revealed an unexpected consequence: stimulated growth of certain cancers. Structurally diverse ATP-competitive RAF inhibitors can either inhibit or paradoxically activate the MAPK pathway, depending whether activation is by BRAF mutation or by an upstream event, such as RAS mutation or receptor tyrosine kinase activation. Here we have identified next-generation RAF inhibitors (dubbed 'paradox breakers') that suppress mutant BRAF cells without activating the MAPK pathway in cells bearing upstream activation. In cells that express the same HRAS mutation prevalent in squamous tumours from patients treated with RAF inhibitors, the first-generation RAF inhibitor vemurafenib stimulated in vitro and in vivo growth and induced expression of MAPK pathway response genes; by contrast the paradox breakers PLX7904 and PLX8394 had no effect. Paradox breakers also overcame several known mechanisms of resistance to first-generation RAF inhibitors. Dissociating MAPK pathway inhibition from paradoxical activation might yield both improved safety and more durable efficacy than first-generation RAF inhibitors, a concept currently undergoing human clinical evaluation with PLX8394.


    Organizational Affiliation

    Plexxikon Inc., 91 Bolivar Drive, Berkeley, California 94710, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Serine/threonine-protein kinase B-rafA292Homo sapiensMutation(s): 10 
Gene Names: BRAFBRAF1RAFB1
EC: 2.7.11.1
Find proteins for P15056 (Homo sapiens)
Explore P15056 
Go to UniProtKB:  P15056
NIH Common Fund Data Resources
PHAROS  P15056
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1OO
Query on 1OO

Download CCD File 
A
N-{3-[(5-chloro-1H-pyrrolo[2,3-b]pyridin-3-yl)carbonyl]-2,4-difluorophenyl}-4-(trifluoromethyl)benzenesulfonamide
C21 H11 Cl F5 N3 O3 S
ZCHAHQLCHCQDFD-UHFFFAOYSA-N
 Ligand Interaction
SO4
Query on SO4

Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
1OOIC50:  190   nM  Binding MOAD
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.205 
  • R-Value Observed: 0.206 
  • Space Group: P 43 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 119.297α = 90
b = 119.297β = 90
c = 52.507γ = 90
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing
REFMACrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-10-28
    Type: Initial release
  • Version 1.1: 2015-11-04
    Changes: Database references