6N4E image
Entry Detail
PDB ID:
6N4E
Keywords:
Title:
hPGDS complexed with a quinoline-3-carboxamide
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2018-11-19
Release Date:
2019-03-27
Method Details:
Experimental Method:
Resolution:
1.65 Å
R-Value Free:
0.20
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Hematopoietic prostaglandin D synthase
Chain IDs:A
Chain Length:200
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation

Abstact

With the goal of discovering more selective anti-inflammatory drugs, than COX inhibitors, to attenuate prostaglandin signaling, a fragment-based screen of hematopoietic prostaglandin D synthase was performed. The 76 crystallographic hits were sorted into similar groups, with the 3-cyano-quinoline 1a (FP IC50 = 220,000 nM, LE = 0.43) being a potent member of the 6,6-fused heterocyclic cluster. Employing SAR insights gained from structural comparisons of other H-PGDS fragment binding mode clusters, the initial hit 1a was converted into the 70-fold more potent quinoline 1d (IC50 = 3,100 nM, LE = 0.49). A systematic substitution of the amine moiety of 1d, utilizing structural information and array chemistry, with modifications to improve inhibitor stability, resulted in the identification of the 300-fold more active H-PGDS inhibitor tool compound 1bv (IC50 = 9.9 nM, LE = 0.42). This selective inhibitor exhibited good murine pharmacokinetics, dose-dependently attenuated PGD2 production in a mast cell degranulation assay and should be suitable to further explore H-PGDS biology.

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Primary Citation of related structures