Compound C28 is an orally active, potent, ATP-competitive lemur tyrosine kinase 3 (LMTK3) inhibitor with additional inhibitory potency against only 4 other kinases among a panel of 140 (IC50 = 67 nM/LMTK3, 5 nM/CLK, 6 nM/DYRK1α, 48 nM/HIPK2, 41 nM/IRAK4). LMTK3 promotes proteasome-mediated LMTK3 degradation and decreases proliferation of cancer cultures (NCI-60 panel IC50 <10 μM) and displays antitumor efficacy in xenograft and transgenic breast cancer mouse models in vivo (10 mg/mL via dialy p.o.).
Orally active, potent, ATP-competitive lemur tyrosine kinase 3 (LMTK3), CLK, DYRK1α, HIPK2 inhibitor with anticancer efficacy in cultures and in vivo.
Elucidating signaling driven by lemur tyrosine kinase 3 (LMTK3) could help drug development. Here, we solve the crystal structure of LMTK3 kinase domain to 2.1Å resolution, determine its consensus motif and phosphoproteome, unveiling in vitro and in vivo LMTK3 substrates.
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