Table 2. Effect of Inactivation by 17EE on the Ability of CYPs 2B1 and 2B6 to Metabolize and Bind Substratesa.
% Remaining compared to Non-Inactivated Controls | |||
---|---|---|---|
CYP | Activity | n-Octylamine 431 nm- 410 nm |
Benzphetamine 385 nm- 418 nm |
2B1 | 34 | 45 | 39 |
2B6 | 21 | 19 | 34 |
CYPs 2B1 or 2B6 were reconstituted with reductase and incubated with 17EE in the presence or absence of NADPH as described in Experimental Procedures. Aliquots were removed and assayed for residual 7EFC activity and for spectral binding changes upon addition of the substrates indicated.