TABLE 1

Testosterone metabolism by wild-type 2B6 and its polymorphic mutants

Wild-type and mutant enzymes were reconstituted with reductase, incubated with testosterone in the presence or absence of NADPH, and metabolites were extracted as described under Materials and Methods. The values for the product formation in micromolar concentrations represent the results from two experiments done in duplicate.

P45016α-Hydroxytestosterone16β-Hydroxytestosterone
KmVmaxVmax/KmKmVmaxVmax/Km
WT13.3 ± 3100 ± 27.5227.7 ± 3100 ± 43.61
2B6.499 ± 1731 ± 40.3129.8 ± 98.1 ± 30.27
2B6.620.7 ± 640 ± 73.7418.1 ± 297 ± 195.36
2B6.910 ± 224 ± 42.440 ± 546 ± 71.15
  • WT, wild-type.