TABLE 4.

Thermodynamic parameters of CYP130-inhibitor interactions derived from ITC and optical titration.

	Ka	ΔGa	ΔH	ΔSb	Kdcalorimetry	Kdoptical
Inhibitor					(1/Ka)
	× 10−4 (M−1)	(kcal/mol)	(kcal/mol)	(cal/mol/K)	(µM)	(µM)
Econazole						1.93 ± 0.03
Step-1	2.78 ± 0.25	−6.07	2.87 ± 0.34	30.0	35.9
Step-2	32.7 ± 3.5	−7.51	9.48 ± 0.61	57.0	3.0
Miconazole						1.70 ± 0.21
Step-1	18.7 ± 1.2	−7.18	6.05 ± 0.09	44.4	5.3
Step-2	3.47 ± 0.37	−6.19	8.47 ± 0.71	49.2	28.8

^aΔG = −RT ln K_a.

^bΔS = (ΔH − ΔG)/T.