5KE0

Discovery of 1-1H-Pyrazolo 4,3-c pyridine-6-yl urea Inhibitors of Extracellular Signal Regulated Kinase ERK for the Treatment of Cancers

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.68 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 

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Literature

Discovery of 1-(1H-Pyrazolo[4,3-c]pyridin-6-yl)urea Inhibitors of Extracellular Signal-Regulated Kinase (ERK) for the Treatment of Cancers.

Lim, J., Kelley, E.H., Methot, J.L., Zhou, H., Petrocchi, A., Chen, H., Hill, S.E., Hinton, M.C., Hruza, A., Jung, J.O., Maclean, J.K., Mansueto, M., Naumov, G.N., Philippar, U., Raut, S., Spacciapoli, P., Sun, D., Siliphaivanh, P.

(2016) J Med Chem 59: 6501-6511

  • DOI: https://doi.org/10.1021/acs.jmedchem.6b00708
  • Primary Citation of Related Structures:  
    5KE0

  • PubMed Abstract: 

    • The ERK/MAPK pathway plays a central role in the regulation of critical cellular processes and is activated in more than 30% of human cancers. Specific BRAF and MEK inhibitors have shown clinical efficacy in patients for the treatment of BRAF-mutant melanoma ...

    The ERK/MAPK pathway plays a central role in the regulation of critical cellular processes and is activated in more than 30% of human cancers. Specific BRAF and MEK inhibitors have shown clinical efficacy in patients for the treatment of BRAF-mutant melanoma. However, the majority of responses are transient, and resistance is often associated with pathway reactivation of the ERK signal pathway. Acquired resistance to these agents has led to greater interest in ERK, a downstream target of the MAPK pathway. De novo design efforts of a novel scaffold derived from SCH772984 by employing hydrogen bond interactions specific for ERK in the binding pocket identified 1-(1H-pyrazolo[4,3-c]pyridin-6-yl)ureas as a viable lead series. Sequential SAR studies led to the identification of highly potent and selective ERK inhibitors with low molecular weight and high LE. Compound 21 exhibited potent target engagement and strong tumor regression in the BRAF(V600E) xenograft model.

    Organizational Affiliation: 

    Departments of †Chemistry, ‡Oncology, §In Vitro Pharmacology, ∥In Vivo Pharmacology, ⊥Chemistry Modeling and Informatics, #Pharmacokinetics, Pharmacodynamics and Drug Metabolism, and ∇Structural Chemistry, Merck & Co., Inc. , 33 Avenue Louis Pasteur, Boston, Massachusetts 02115, United States.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mitogen-activated protein kinase 1A366Rattus norvegicusMutation(s): 0 
Gene Names: Mapk1, Erk2, Mapk, Prkm1
EC: 2.7.11.24
UniProt
Find proteins for P63086 (Rattus norvegicus)
Explore P63086 
Go to UniProtKB:  P63086
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63086
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
6S9
Query on 6S9
Download Ideal Coordinates CCD File 
B [auth A]1-[3-(2-methylpyridin-4-yl)-1~{H}-pyrazolo[4,3-c]pyridin-6-yl]-3-(phenylmethyl)urea
C20 H18 N6 O
XNCYRRXMFCUPKS-UHFFFAOYSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A]		SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
6S9 BindingDB:  5KE0 IC50: min: 0.2, max: 0.9 (nM) from 5 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.68 Å
  • R-Value Free: 0.191 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.169 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.105α = 90
b = 91.334β = 90
c = 62.917γ = 90
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling
MOLREPphasing
BUSTERrefinement

Structure Validation

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Ligand Structure Quality Assessment 


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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-07-06
    Type: Initial release
  • Version 1.1: 2016-07-27
    Changes: Database references
  • Version 1.2: 2017-11-22
    Changes: Database references, Derived calculations, Refinement description