4mf1 | pdb_00004mf1
ITK kinase domain in complex with benzothiazole inhibitor 12b (1S,2S)-2-{4-[(DIMETHYLAMINO)METHYL]PHENYL}-N-[6-(1H-PYRAZOL-4-YL)-1,3-BENZOTHIAZOL-2-YL]CYCLOPROPANECARBOXAMIDE
Structural highlights
Disease[ITK_HUMAN] Defects in ITK are the cause of lymphoproliferative syndrome EBV-associated autosomal type 1 (LPSA1) [MIM:613011]. LPSA1 is a rare immunodeficiency characterized by extreme susceptibility to infection with Epstein-Barr virus (EBV). Inadequate immune response to EBV can have a fatal outcome. Clinical features include splenomegaly, lymphadenopathy, anemia, thrombocytopenia, pancytopenia, recurrent infections. There is an increased risk for lymphoma.[1] Function[ITK_HUMAN] Tyrosine kinase that plays an essential role in regulation of the adaptive immune response. Regulates the development, function and differentiation of conventional T-cells and nonconventional NKT-cells. When antigen presenting cells (APC) activate T-cell receptor (TCR), a series of phosphorylation lead to the recruitment of ITK to the cell membrane, in the vicinity of the stimulated TCR receptor, where it is phosphorylated by LCK. Phosphorylation leads to ITK autophosphorylation and full activation. Once activated, phosphorylates PLCG1, leading to the activation of this lipase and subsequent cleavage of its substrates. In turn, the endoplasmic reticulum releases calcium in the cytoplasm and the nuclear activator of activated T-cells (NFAT) translocates into the nucleus to perform its transcriptional duty. Phosphorylates 2 essential adapter proteins: the linker for activation of T-cells/LAT protein and LCP2. Then, a large number of signaling molecules such as VAV1 are recruited and ultimately lead to lymphokine production, T-cell proliferation and differentiation.[2] [3] [4] Publication Abstract from PubMedInhibition of the non-receptor tyrosine kinase ITK, a component of the T-cell receptor signalling cascade, may represent a novel treatment for allergic asthma. Here we report the structure-based optimization of a series of benzothiazole amides that demonstrate sub-nanomolar inhibitory potency against ITK with good cellular activity and kinase selectivity. We also elucidate the binding mode of these inhibitors by solving the X-ray crystal structures of several inhibitor-ITK complexes. Structure-based design and synthesis of potent benzothiazole inhibitors of interleukin-2 inducible T cell kinase (ITK).,Mackinnon CH, Lau K, Burch JD, Chen Y, Dines J, Ding X, Eigenbrot C, Heifetz A, Jaochico A, Johnson A, Kraemer J, Kruger S, Krulle TM, Liimatta M, Ly J, Maghames R, Montalbetti CA, Ortwine DF, Perez-Fuertes Y, Shia S, Stein DB, Trani G, Vaidya DG, Wang X, Bromidge SM, Wu LC, Pei Z Bioorg Med Chem Lett. 2013 Dec 1;23(23):6331-5. doi: 10.1016/j.bmcl.2013.09.069. , Epub 2013 Oct 1. PMID:24138940[5] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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