3D3P image
Entry Detail
PDB ID:
3D3P
Keywords:
Title:
Crystal structure of PDE4B catalytic domain in complex with a pyrazolopyridine inhibitor
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2008-05-12
Release Date:
2009-05-19
Method Details:
Experimental Method:
Resolution:
1.75 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.20
Space Group:
I 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:cAMP-specific 3',5'-cyclic phosphodiesterase 4B
Mutations:S654A, S659A, S661A
Chain IDs:A
Chain Length:353
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Pyrazolopyridines as a novel structural class of potent and selective PDE4 inhibitors.
Bioorg.Med.Chem.Lett. 18 4237 4241 (2008)
PMID: 18539455 DOI: 10.1016/j.bmcl.2008.05.052

Abstact

Optimisation of a high-throughput screening hit resulted in the discovery of 4-(substituted amino)-1-alkyl-pyrazolo[3,4-b]pyridine-5-carboxamides as potent and selective inhibitors of Phosphodiesterase 4 (PDE4). Herein, we describe early SAR studies around this novel template highlighting preferred substituents and rationalization of SAR through X-ray crystal structures of analogues bound to the PDE4 active site. Pyrazolopyridine 20a was found to be a potent and selective PDE4 inhibitor which also inhibits LPS induced TNF-alpha production from isolated human peripheral blood mononuclear cells and has an encouraging rat PK profile suitable for oral dosing.

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