4p0n | pdb_00004p0n
Crystal structure of PDE10a with a novel Imidazo[4,5-b]pyridine inhibitor
Structural highlights
FunctionPDE10_HUMAN Plays a role in signal transduction by regulating the intracellular concentration of cyclic nucleotides. Can hydrolyze both cAMP and cGMP, but has higher affinity for cAMP and is more efficient with cAMP as substrate.[1] Publication Abstract from PubMedWe report the discovery of novel imidazo[4,5-b]pyridines as potent and selective inhibitors of PDE10A. The investigation began with our recently disclosed ketobenzimidazole 1, which exhibited single digit nanomolar PDE10A activity but poor oral bioavailability. To improve oral bioavailability, we turned to novel scaffold imidazo[4,5-b]pyridine 2, which not only retained nanomolar PDE10A activity but was also devoid of the morpholine metabolic liability. Structure-activity relationship studies were conducted systematically to examine how various regions of the molecule impacted potency. X-ray cocrystal structures of compounds 7 and 24 in human PDE10A helped to elucidate the key bonding interactions. Five of the most potent and structurally diverse imidazo[4,5-b]pyridines (4, 7, 12b, 24a, and 24b) with PDE10A IC50 values ranging from 0.8 to 6.7 nM were advanced into receptor occupancy studies. Four of them (4, 12b, 24a, and 24b) achieved 55-74% RO at 10 mg/kg po. Discovery of Novel Imidazo[4,5-b]pyridines as Potent and Selective Inhibitors of Phosphodiesterase 10A (PDE10A).,Hu E, Andrews K, Chmait S, Zhao X, Davis C, Miller S, Hill Della Puppa G, Dovlatyan M, Chen H, Lester-Zeiner D, Able J, Biorn C, Ma J, Shi J, Treanor J, Allen JR ACS Med Chem Lett. 2014 Mar 28;5(6):700-5. doi: 10.1021/ml5000993. eCollection, 2014 Jun 12. PMID:24944747[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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