TABLE 5

TDI kinetic parameters for dataset 4 (proprietary compound, inhibition of CYP3A4)

Data are presented as parameter estimate ± S.E. kprod is the rate constant for metabolite formation. Enzyme loss is modeled with the rate constant kloss.

Numerical Method, EII ModelReplot Method
Repeat 1Repeat 2Repeat 1Repeat 2
KI (μM)59.0 ± 13.570.4 ± 13.7
kinact (min−1)0.03 ± 0.0040.04 ± 0.004
kinact/KI (nM−1 min−1)0.51 ± 0.140.57 ± 0.12
KI1 (μM)1.77 ± 0.121.85 ± 0.15
KI2 (μM)500 (fixed)500 (fixed)
kinact1 (min−1)0.003 ± 0.0010.003 ± 0.001
kinact1/KI1 (nM−1 min−1)1.6 ± 0.51.6 ± 0.15
kinact2/KI2 (nM−1 min−1)0.24 ± 0.0240.28 ± 0.028
kprod (min−1)10.2 ± 0.0912.81 ± 0.14
kloss (min−1)0.006 ± 0.00080.004 ± 0.001