3HUC

Human p38 MAP Kinase in Complex with RL40


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.195 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Fluorophore labeling of the glycine-rich loop as a method of identifying inhibitors that bind to active and inactive kinase conformations.

Simard, J.R.Getlik, M.Grutter, C.Schneider, R.Wulfert, S.Rauh, D.

(2010) J.Am.Chem.Soc. 132: 4152-4160

  • DOI: 10.1021/ja908083e
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Targeting protein kinases with small organic molecules is a promising strategy to regulate unwanted kinase activity in both chemical biology and medicinal chemistry research. Traditionally, kinase inhibitors are identified in activity-based screening ...

    Targeting protein kinases with small organic molecules is a promising strategy to regulate unwanted kinase activity in both chemical biology and medicinal chemistry research. Traditionally, kinase inhibitors are identified in activity-based screening assays using enzymatically active kinase preparations to measure the perturbation of substrate phosphorylation, often resulting in the enrichment of classical ATP competitive (Type I) inhibitors. However, addressing enzymatically incompetent kinase conformations offers new opportunities for targeted therapies and is moving to the forefront of kinase inhibitor research. Here we report the development of a new FLiK (Fluorescent Labels in Kinases) binding assay to detect small molecules that induce changes in the conformation of the glycine-rich loop. Due to cross-talk between the glycine-rich loop and the activation loop in kinases, this alternative labeling approach can also detect ligands that stabilize inactive kinase conformations, including slow-binding Type II and Type III kinase inhibitors. Protein X-ray crystallography validated the assay results and identified a novel DFG-out binding mode for a quinazoline-based inhibitor in p38alpha kinase. We also detected the high-affinity binding of a clinically relevant and specific VEGFR2 inhibitor, and we provide structural details of its binding mode in p38alpha, in which it stabilizes the DFG-out conformation. Last, we demonstrate the power of this new FLiK labeling strategy to detect the binding of Type I ligands that induce conformational changes in the glycine-rich loop as a means of gaining affinity for the target kinase. This approach may be a useful alternative to develop direct binding assays for kinases that do not adopt the DFG-out conformation while also avoiding the use of expensive kits, detection reagents, or radioactivity frequently employed with activity-based assays.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mitogen-activated protein kinase 14
A
360Homo sapiensMutation(s): 0 
Gene Names: MAPK14 (CSBP, CSBP1, CSBP2, CSPB1, MXI2, SAPK2A)
EC: 2.7.11.24
Find proteins for Q16539 (Homo sapiens)
Go to Gene View: MAPK14
Go to UniProtKB:  Q16539
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
G97
Query on G97

Download SDF File 
Download CCD File 
A
N-[2-phenyl-4-(1H-pyrazol-3-ylamino)quinazolin-7-yl]prop-2-enamide
N-(4-(1H-pyrazol-3-ylamino)-2-phenylquinazolin-7-yl)acrylamide
C20 H16 N6 O
DBXZXNJCPSGVAC-UHFFFAOYSA-N
 Ligand Interaction
BOG
Query on BOG

Download SDF File 
Download CCD File 
A
B-OCTYLGLUCOSIDE
C14 H28 O6
HEGSGKPQLMEBJL-RKQHYHRCSA-N
 Ligand Interaction
MES
Query on MES

Download SDF File 
Download CCD File 
A
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
G97Kd: 1030 nM BINDINGMOAD
G97Kd: 1030 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.8 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.195 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 69.350α = 90.00
b = 69.830β = 90.00
c = 74.420γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
XSCALEdata scaling
PDB_EXTRACTdata extraction
XDSdata scaling
PHASERphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-03-09
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance