Download MendeleyEnantiomer Discrimination Illustrated by the High Resolution Crystal Structures of Type 4 Phosphodiesterase
Huai, Q., Sun, Y., Wang, H., Macdonald, D., Aspiotis, R., Robinson, H., Huang, Z., Ke, H.(2006) J Med Chem 49: 1867-1873
- PubMed: 16539372
- DOI: https://doi.org/10.1021/jm051273d
- Primary Citation of Related Structures:
2FM0, 2FM5 - PubMed 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.
Organizational Affiliation:
Department of Biochemistry and Biophysics and Lineberger Comprehensive Cancer Center, The University of North Carolina, Chapel Hill, North Carolina 27599-7260, USA.
