1XMU image
Entry Detail
PDB ID:
1XMU
Keywords:
Title:
Catalytic Domain Of Human Phosphodiesterase 4B In Complex With Roflumilast
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2004-10-04
Release Date:
2004-12-14
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.24
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:cAMP-specific 3',5'-cyclic phosphodiesterase 4B
Chain IDs:A
Chain Length:398
Number of Molecules:1
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Description:cAMP-specific 3',5'-cyclic phosphodiesterase 4B
Chain IDs:B
Chain Length:398
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
CME A CYS S,S-(2-HYDROXYETHYL)THIOCYSTEINE
Primary Citation
Structural Basis for the Activity of Drugs that Inhibit Phosphodiesterases.
STRUCTURE 12 2233 2247 (2004)
PMID: 15576036 DOI: 10.1016/j.str.2004.10.004

Abstact

Phosphodiesterases (PDEs) comprise a large family of enzymes that catalyze the hydrolysis of cAMP or cGMP and are implicated in various diseases. We describe the high-resolution crystal structures of the catalytic domains of PDE4B, PDE4D, and PDE5A with ten different inhibitors, including the drug candidates cilomilast and roflumilast, for respiratory diseases. These cocrystal structures reveal a common scheme of inhibitor binding to the PDEs: (i) a hydrophobic clamp formed by highly conserved hydrophobic residues that sandwich the inhibitor in the active site; (ii) hydrogen bonding to an invariant glutamine that controls the orientation of inhibitor binding. A scaffold can be readily identified for any given inhibitor based on the formation of these two types of conserved interactions. These structural insights will enable the design of isoform-selective inhibitors with improved binding affinity and should facilitate the discovery of more potent and selective PDE inhibitors for the treatment of a variety of diseases.

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Primary Citation of related structures