3GCV

Human P38 MAP Kinase in Complex with RL62

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 

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This is version 1.3 of the entry. See complete history. 


Literature

Development of a fluorescent-tagged kinase assay system for the detection and characterization of allosteric kinase inhibitors.

Simard, J.R., Getlik, M., Grutter, C., Pawar, V., Wulfert, S., Rabiller, M., Rauh, D.

(2009) J Am Chem Soc 131: 13286-13296

  • DOI: 10.1021/ja902010p
  • Primary Citation of Related Structures:  
    3GCP, 3GCQ, 3GCS, 3GCU, 3GCV

  • PubMed Abstract: 

    • Kinase disregulation disrupts the intricate network of intracellular signaling pathways and contributes to the onset of diseases such as cancer. Although several kinase inhibitors are on the market, inhibitor selectivity and drug resistance mutations persist as fundamental challenges in the development of effective long-term treatments ...

    Kinase disregulation disrupts the intricate network of intracellular signaling pathways and contributes to the onset of diseases such as cancer. Although several kinase inhibitors are on the market, inhibitor selectivity and drug resistance mutations persist as fundamental challenges in the development of effective long-term treatments. Chemical entities binding to less conserved allosteric sites would be expected to offer new opportunities for scaffold development. Because no high-throughput method was previously available, we developed a fluorescence-based kinase binding assay for identifying and characterizing ligands which stabilize the inactive kinase conformation. Here, we present a description of the development and validation of this assay using the serine/threonine kinase p38alpha. By covalently attaching fluorophores to the activation loop of the kinase, we were able to detect conformational changes and measure the K(d), k(on), and k(off) associated with the binding and dissociation of ligands to the allosteric pocket. We report the SAR of a synthesized focused library of pyrazolourea derivatives, a scaffold known to bind with high affinity to the allosteric pocket of p38alpha. Additionally, we used protein X-ray crystallography together with our assay to examine the binding and dissociation kinetics to characterize potent quinazoline- and quinoline-based type II inhibitors, which also utilize this binding pocket in p38alpha. Last, we identified the b-Raf inhibitor sorafenib as a potent low nanomolar inhibitor of p38alpha and used protein X-ray crystallography to confirm a unique binding mode to the inactive kinase conformation.

    Organizational Affiliation: 

    Chemical Genomics Centre of the Max Planck Society, Otto-Hahn-Strasse 15, D-44227 Dortmund, Germany.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mitogen-activated protein kinase 14A360Homo sapiensMutation(s): 4 
Gene Names: MAPK14, CSBP, CSBP1, CSBP2, CSPB1, MXI2, SAPK2A
EC: 2.7.11.24
UniProt & NIH Common Fund Data Resources
Find proteins for Q16539 (Homo sapiens)
Explore Q16539 
Go to UniProtKB:  Q16539
PHAROS:  Q16539
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ16539
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SS6
Query on SS6
Download Ideal Coordinates CCD File 
B [auth A]1-{3-[(6-aminoquinazolin-4-yl)amino]phenyl}-3-[3-tert-butyl-1-(3-methylphenyl)-1H-pyrazol-5-yl]urea
C29 H30 N8 O
MWDKKNFEOXEAEC-UHFFFAOYSA-N		 Ligand Interaction
BOG
Query on BOG
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]		octyl beta-D-glucopyranoside
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N		 Ligand Interaction
Binding Affinity Annotations 
IDSourceBinding Affinity
SS6 Binding MOAD:  3GCV Kd: 74 (nM) from 1 assay(s)
PDBBind:  3GCV Kd: 74 (nM) from 1 assay(s)
BindingDB:  3GCV IC50: min: 320, max: 420 (nM) from 2 assay(s)
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.199 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.785α = 90
b = 70.003β = 90
c = 74.513γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
XDSdata scaling

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: 2009-06-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations, Structure summary
  • Version 1.3: 2021-10-20
    Changes: Database references, Structure summary