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J Med Chem. 2006 Mar 23;49(6):1867-73.

Enantiomer discrimination illustrated by the high resolution crystal structures of type 4 phosphodiesterase.

Author information

1
Department of Biochemistry and Biophysics and Lineberger Comprehensive Cancer Center, The University of North Carolina, Chapel Hill, North Carolina 27599-7260, USA.

Abstract

Type 4 phosphodiesterase (PDE4) inhibitors are emerging as new treatments for a number of disorders including asthma and chronic obstructive pulmonary disease. Here we report the biochemical characterization on the second generation inhibitor (+)-1 (L-, IC50=0.4 nM) and its enantiomer (-)-1 (L-, IC50=43 nM) and their cocrystal structures with PDE4D at 2.0 A resolution. Despite the 107-fold affinity difference, both enantiomers interact with the same sets of residues in the rigid active site. The weaker (-)-1 adopts an unfavorable conformation to preserve the pivotal interactions between the Mg-bound waters and the N-oxide of pyridine. These structures support a model in which inhibitors are anchored by the invariant glutamine at one end and the metal-pocket residues at another end. This model provides explanations for most of the observed structure-activity relationship and the metal ion dependency of the catechol-ether based inhibitors and should facilitate their further design.

PMID:
16539372
PMCID:
PMC2527038
DOI:
10.1021/jm051273d
[Indexed for MEDLINE]
Free PMC Article

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