Mps1/TTK-IN-1 (Compound cpd-5), a derivative of NMS-P715 ( HY-12382 ), is a Mps1 kinase inhibitor with an IC 50 of 9.2 nM and a K d of 1.6 nM. Mps1/TTK-IN-1 specifically targets the ATP-binding pocket of the Mps1 kinase. Mps1/TTK-IN-1 maintains inhibitory activity against Mps1 drug-resistant mutants (C604Y, C604W) with IC 50 values of 170 and 19 nM and K d values of 471 and 349 nM. Mps1/TTK-IN-1 can block the phosphorylation of kinetochore protein KNL1 mediated by Mps1 , interfere with the spindle assembly checkpoint function, prevent the correct separation of chromosomes, and thereby inhibit the mitosis and proliferation of tumor cells.
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