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Crystal Structure of PDE10A with Novel Keto-Benzimidazole 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 PubMedOur development of PDE10A inhibitors began with an HTS screening hit (1) that exhibited both high p-glycoprotein (P-gp) efflux ratios in rat and human and poor metabolic stability. Based on co-crystal structure of 1 in human PDE10A enzyme, we designed a novel keto-benzimidazole 26 with comparable PDE10A potency devoid of efflux liabilities. On target in vivo coverage of PDE10A in rat brain was assessed using our previously reported LC-MS/MS receptor occupancy (RO) technology. Compound 26 achieved 55% RO of PDE10A at 30 mg/kg po and covered PDE10A receptors in rat brain in a dose-dependent manner. Co-crystal structure of 26 in PDE10A confirmed the binding mode of the novel scaffold. Further optimization resulted in the identification of keto-benzimidazole 34 which showed an increased in vivo efficacy of 57% RO in rats at 10 mg/kg po and an improved in vivo rat clearance and oral bioavailability. Design, Optimization, and Biological Evaluation of Novel Keto-Benzimidazoles as Potent and Selective Inhibitors of Phosphodiesterase 10A (PDE10A).,Hu E, Kunz RK, Chen N, Rumfelt S, Siegmund A, Andrews K, Chmait S, Zhao S, Davis C, Chen H, Lester-Zeiner D, Ma J, Biorn C, Shi J, Porter A, Treanor J, Allen JR J Med Chem. 2013 Oct 8. PMID:24102193[2] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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