Crystal structure of the catalytic domain of the proto-oncogene tyrosine-protein kinase MER in complex with inhibitor UNC1917

Experimental Data Snapshot

  • Resolution: 2.72 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.248 

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Ligand Structure Quality Assessment 

This is version 1.3 of the entry. See complete history


Pseudo-Cyclization through Intramolecular Hydrogen Bond Enables Discovery of Pyridine Substituted Pyrimidines as New Mer Kinase Inhibitors.

Zhang, W.Zhang, D.Stashko, M.A.Deryckere, D.Hunter, D.Kireev, D.Miley, M.J.Cummings, C.Lee, M.Norris-Drouin, J.Stewart, W.M.Sather, S.Zhou, Y.Kirkpatrick, G.Machius, M.Janzen, W.P.Earp, H.S.Graham, D.K.Frye, S.V.Wang, X.

(2013) J Med Chem 56: 9683-9692

  • DOI: https://doi.org/10.1021/jm401387j
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Abnormal activation or overexpression of Mer receptor tyrosine kinase has been implicated in survival signaling and chemoresistance in many human cancers. Consequently, Mer is a promising novel cancer therapeutic target. A structure-based drug design approach using a pseudo-ring replacement strategy was developed and validated to discover a new family of pyridinepyrimidine analogues as potent Mer inhibitors. Through SAR studies, 10 (UNC2250) was identified as the lead compound for further investigation based on high selectivity against other kinases and good pharmacokinetic properties. When applied to live cells, 10 inhibited steady-state phosphorylation of endogenous Mer with an IC50 of 9.8 nM and blocked ligand-stimulated activation of a chimeric EGFR-Mer protein. Treatment with 10 also resulted in decreased colony-forming potential in rhabdoid and NSCLC tumor cells, thereby demonstrating functional antitumor activity. The results provide a rationale for further investigation of this compound for therapeutic application in patients with cancer.

  • Organizational Affiliation

    Center for Integrative Chemical Biology and Drug Discovery and ‡Division of Chemical Biology and Medicinal Chemistry, Eshelman School of Pharmacy, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Tyrosine-protein kinase Mer
A, B
313Homo sapiensMutation(s): 0 
Gene Names: MERMERTK
UniProt & NIH Common Fund Data Resources
Find proteins for Q12866 (Homo sapiens)
Explore Q12866 
Go to UniProtKB:  Q12866
GTEx:  ENSG00000153208 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ12866
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 24K

Download Ideal Coordinates CCD File 
H [auth A],
L [auth B]
C19 H27 N5 O
Query on CL

Download Ideal Coordinates CCD File 
C [auth A]
D [auth A]
E [auth A]
F [auth A]
I [auth B]
C [auth A],
D [auth A],
E [auth A],
F [auth A],
I [auth B],
J [auth B],
K [auth B]
Query on MG

Download Ideal Coordinates CCD File 
Binding Affinity Annotations 
IDSourceBinding Affinity
24K BindingDB:  4M3Q IC50: min: 17, max: 55 (nM) from 2 assay(s)
PDBBind:  4M3Q IC50: 17 (nM) from 1 assay(s)
Experimental Data & Validation

Experimental Data

  • Resolution: 2.72 Å
  • R-Value Free: 0.296 
  • R-Value Work: 0.243 
  • R-Value Observed: 0.248 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 50.924α = 90
b = 91.12β = 99.81
c = 69.699γ = 90
Software Package:
Software NamePurpose
PHENIXmodel building
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2013-11-27
    Type: Initial release
  • Version 1.1: 2014-01-15
    Changes: Database references
  • Version 1.2: 2017-11-15
    Changes: Refinement description
  • Version 1.3: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description