4L8M: Human P38 Map Kinase In Complex With A Dibenzoxepinone

Five series of metabolically stable disubstituted dibenzo[b,e]oxepin-11(6H)-ones were synthesized and tested in a p38alpha enzyme assay for their inhibition of tumor necrosis factor-alpha (TNF-alpha) release in human whole blood. Compared to the monosubstituted dibenzo[b,e]oxepin-11(6H)-one derivatives, it has been shown that the additional introduction of hydrophilic residues at position 9 leads to a substantial improvement of the inhibitory potency and metabolic stability. Using protein X-ray crystallography, the binding mode of the disubstituted dibenzoxepinones and the induction of a glyince flip in the hinge region were confirmed. The most potent compound of this series, 32e, shows an outstanding biological activity on isolated p38alpha, with an IC50 value of 1.6 nM, extraordinary selectivity (by a factor >1000, Kinase WholePanelProfiler), and low ATP competitiveness. The ability to inhibit the release of TNF-alpha from human whole blood was optimized down to an IC50 value of 125 nM. With the promising dibenzoxepinone inhibitor 3i, a pharmacokinetic study in mice was conducted.
PDB ID: 4L8MDownload
MMDB ID: 114749
PDB Deposition Date: 2013/6/17
Updated in MMDB: 2013/10
Experimental Method:
x-ray diffraction
Resolution: 2.1  Å
Source Organism:
Similar Structures:
Biological Unit for 4L8M: monomeric; determined by author and by software (PISA)
Molecular Components in 4L8M
Label Count Molecule
Protein (1 molecule)
Mitogen-activated Protein Kinase 14(Gene symbol: MAPK14)
Molecule annotation
Chemicals (3 molecules)
* Click molecule labels to explore molecular sequence information.

Citing MMDB