TABLE 1.

Kinetic constants of o-sulfonation of B[a]P-7,8-catechol

Enzymes	Vmax	kcat	Km	Ki	kcat/Km
	nmol/min/mg	min−1	μm	μm	min−1 μm−1
SULT1A1*1	1.68 ± 0.07	0.059 ± 0.002	0.061 ± 0.004	29.9 ± 3.5	0.97
SULT1A1*3	0.84 ± 0.02	0.030 ± 0.001	0.08 ± 0.009	NA	0.38
SULT1A3	9.2 ± 0.9	0.32 ± 0.03	3.8 ± 0.8	NA	0.084
SULT1E1	15.4 ± 3.7	0.54 ± 0.13	0.90 ± 0.26	0.08 ± 0.02	0.60
COMTa	54.2	1.48	2.10	NA	0.70

^a Ref. 26.