Enzyme kinase assays
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Recombinant GST- or His-tagged aurora-A (TPX2), and aurora-B proteins were expressed using a baculovirus system and purified by affinity chromatography. AMG 900 activity was assessed using a standardized homogenous time-resolved fluorescence (HTRF) assay. Enzyme assays for 24 other kinases (aurora-C, p38α, TYK2, JNK2, JAK3, c-Met, VEGFR2, p38β, TIE-2, ABL (T315I), ERK1, BTK, JNK3, CDK5, PKAα, JNK1, p70S6K, PKBα, MSK1, LCK, SRC, IGFR, JAK2, and c-KIT) were done internally in a similar manner. Concentrations of enzyme, peptide substrate, and ATP in the reaction were optimized depending on the specific activity of the kinase and measured Km values for their corresponding substrates. AMG 900 was evaluated in a kinome competition binding assay (n = 353 unique kinases) by Ambit Biosciences. AMG 900 was initially screened at a single concentration of 1000 nM, and quantitative binding constants (Kd) were determined for each positive hit (< 20 percentage of control).
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References:
[1]. Payton, M., et al., Preclinical evaluation of AMG 900, a novel potent and highly selective pan-aurora kinase inhibitor with activity in taxane-resistant tumor cell lines. Cancer Res, 2010. 70(23): p. 9846-54.
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