| Assay Method Information | |
| | Isothermal titration calorimetry (ITC) |
| Description: | The binding of inhibitors to Aurora A kinase was analyzed with a MicroCal iTC200 titration calorimeter (GE Healthcare, Piscataway, N.J.). The protein was exchanged into 100 mM Na/K phosphate (pH 7.4) via PD-10 columns (GE Healthcare Lifesciences; Piscataway, N.J.). A total of 18 aliquots (2.2 uL each) of the protein solution (125 uM) were injected into 200 μL of the inhibitor solution (10 uM) at 25° C. The ITC cell mixture was constantly stirred at 1000 rpm and recorded for 120 seconds between injections. Heat generation due to dilution (blank) was determined in a separate experiment by diluting protein into buffer. The corrected heat values were fitted using a nonlinear least square curve-fitting algorithm (Microcal Origin 7.0) to obtain the stoichiometry (n), binding constant (Ka, Kd). |
| Affinity data for this assay | |
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