4ei4 | pdb_00004ei4
JAK1 kinase (JH1 domain) in complex with compound 20
Structural highlights
FunctionJAK1_HUMAN Tyrosine kinase of the non-receptor type, involved in the IFN-alpha/beta/gamma signal pathway. Kinase partner for the interleukin (IL)-2 receptor. Publication Abstract from PubMedHerein we report the discovery of the C-2 methyl substituted imidazopyrrolopyridine series and its optimization to provide potent and orally bioavailable JAK1 inhibitors with selectivity over JAK2. The C-2 methyl substituted inhibitor 4 exhibited not only improved JAK1 potency relative to unsubstituted compound 3 but also notable JAK1 vs JAK2 selectivity (20-fold and >33-fold in biochemical and cell-based assays, respectively). Features of the X-ray structures of 4 in complex with both JAK1 and JAK2 are delineated. Efforts to improve the in vitro and in vivo ADME properties of 4 while maintaining JAK1 selectivity are described, culminating in the discovery of a highly optimized and balanced inhibitor (20). Details of the biological characterization of 20 are disclosed including JAK1 vs JAK2 selectivity levels, preclinical in vivo PK profiles, performance in an in vivo JAK1-mediated PK/PD model, and attributes of an X-ray structure in complex with JAK1. Discovery and Optimization of C-2 Methyl Imidazopyrrolopyridines as Potent and Orally Bioavailable JAK1 Inhibitors with Selectivity over JAK2.,Zak M, Mendonca R, Balazs M, Barrett K, Bergeron P, Blair WS, Chang C, Deshmukh G, Devoss J, Dragovich PS, Eigenbrot C, Ghilardi N, Gibbons P, Gradl S, Hamman C, Hanan EJ, Harstad E, Hewitt PR, Hurley CA, Jin T, Johnson A, Johnson T, Kenny JR, Koehler MF, Bir Kohli P, Kulagowski JJ, Labadie S, Liao J, Liimatta M, Lin Z, Lupardus PJ, Maxey RJ, Murray JM, Pulk R, Rodriguez M, Savage S, Shia S, Steffek M, Ubhayakar S, Ultsch M, van Abbema A, Ward SI, Xiao L, Xiao Y J Med Chem. 2012 Jun 28. PMID:22698084[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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