3HLL

Crystal Structure of Human p38alpha complexed with PH-797804


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.219 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural bioinformatics-based prediction of exceptional selectivity of p38 MAP kinase inhibitor PH-797804.

Xing, L.Shieh, H.S.Selness, S.R.Devraj, R.V.Walker, J.K.Devadas, B.Hope, H.R.Compton, R.P.Schindler, J.F.Hirsch, J.L.Benson, A.G.Kurumbail, R.G.Stegeman, R.A.Williams, J.M.Broadus, R.M.Walden, Z.Monahan, J.B.

(2009) Biochemistry 48: 6402-6411

  • DOI: 10.1021/bi900655f
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • PH-797804 is a diarylpyridinone inhibitor of p38alpha mitogen-activated protein (MAP) kinase derived from a racemic mixture as the more potent atropisomer (aS), first proposed by molecular modeling and subsequently confirmed by experiments. On the ba ...

    PH-797804 is a diarylpyridinone inhibitor of p38alpha mitogen-activated protein (MAP) kinase derived from a racemic mixture as the more potent atropisomer (aS), first proposed by molecular modeling and subsequently confirmed by experiments. On the basis of structural comparison with a different biaryl pyrazole template and supported by dozens of high-resolution crystal structures of p38alpha inhibitor complexes, PH-797804 is predicted to possess a high level of specificity across the broad human kinase genome. We used a structural bioinformatics approach to identify two selectivity elements encoded by the TXXXG sequence motif on the p38alpha kinase hinge: (i) Thr106 that serves as the gatekeeper to the buried hydrophobic pocket occupied by 2,4-difluorophenyl of PH-797804 and (ii) the bidentate hydrogen bonds formed by the pyridinone moiety with the kinase hinge requiring an induced 180 degrees rotation of the Met109-Gly110 peptide bond. The peptide flip occurs in p38alpha kinase due to the critical glycine residue marked by its conformational flexibility. Kinome-wide sequence mining revealed rare presentation of the selectivity motif. Corroboratively, PH-797804 exhibited exceptionally high specificity against MAP kinases and the related kinases. No cross-reactivity was observed in large panels of kinase screens (selectivity ratio of >500-fold). In cellular assays, PH-797804 demonstrated superior potency and selectivity consistent with the biochemical measurements. PH-797804 has met safety criteria in human phase I studies and is under clinical development for several inflammatory conditions. Understanding the rationale for selectivity at the molecular level helps elucidate the biological function and design of specific p38alpha kinase inhibitors.


    Organizational Affiliation

    Structural and Computational Chemistry, St. Louis Laboratories,Pfizer Global Research and Development, 700 Chesterfield Parkway West, Chesterfield, Missouri 63017, USA. li.xing@pfizer.com



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Mitogen-activated protein kinase 14
A
360Homo sapiensMutation(s): 0 
Gene Names: CSBPCSBP1CSBP2CSPB1MAPK14MXI2THP-1SAPK2A
EC: 2.7.11.24
Find proteins for Q16539 (Homo sapiens)
Go to UniProtKB:  Q16539
NIH Common Fund Data Resources
PHAROS  Q16539
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
I45
Query on I45

Download CCD File 
A
3-{3-bromo-4-[(2,4-difluorobenzyl)oxy]-6-methyl-2-oxopyridin-1(2H)-yl}-N,4-dimethylbenzamide
C22 H19 Br F2 N2 O3
KCAJXIDMCNPGHZ-UHFFFAOYSA-N
 Ligand Interaction
I46
Query on I46

Download CCD File 
A
2-fluoro-4-[4-(4-fluorophenyl)-1H-pyrazol-3-yl]pyridine
C14 H9 F2 N3
YJCHZVXSPFPKMX-UHFFFAOYSA-N
 Ligand Interaction
PO2
Query on PO2

Download CCD File 
A
HYPOPHOSPHITE
O2 P
GQZXNSPRSGFJLY-UHFFFAOYSA-M
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
I45IC50:  17   nM  BindingDB
I45IC50:  2.5   nM  BindingDB
I45IC50:  5.800000190734863   nM  BindingDB
I45IC50:  247   nM  BindingDB
I45Kd:  2.5   nM  BindingDB
I45Ki :  5.800000190734863   nM  PDBBind
I45Ki:  5.799999713897705   nM  Binding MOAD
I45IC50:  1.100000023841858   nM  BindingDB
I45Kd:  2.799999952316284   nM  BindingDB
I45Ki:  2.9000000953674316   nM  BindingDB
I45Ki:  5.800000190734863   nM  BindingDB
I45IC50:  2.299999952316284   nM  BindingDB
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.217 
  • R-Value Observed: 0.219 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 65.114α = 90
b = 74.645β = 90
c = 77.066γ = 90
Software Package:
Software NamePurpose
ADSCdata collection
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling
REFMACphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-07-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance