Gp amc

Example 3

Enzyme Kinetics of 3099DOX Activation by FAP

Michaelis-Menten enzyme kinetics for FAP were measured using a SpectraMax M2e microplate reader (Molecular Devices, Sunnyvale, Calif., USA). The assays were performed in FAP buffer (50 mM Tris, 140 mM NaCl, pH 7.5) at 25° C., and the fluorescence continuously monitored at excitation and emission wavelengths of 380 and 460 nm, respectively. Kinetic constants (k_cat and K_m) were determined using GP-AMC (Bachem, Torrance, Calif., USA), Ac-(D)-AP-AFC (MP Biomedicals, Solon, Ohio, USA) and test article concentrations equivalent to 0.1-5 times their respective K_m values, and with 5-10 nM enzyme. All assays were performed in triplicate, and the results were calculated with a nonlinear regression analysis, relying on a Michaelis-Menten curve fit using GraphPad software.

3099DOX at various concentrations ranging from 8.5×10⁻⁶ M to 6.9×10⁻⁴ M was incubated with 1.34×10⁻⁸ M FAP or PREP at 37° C., and released doxorubicin measured. Results of kinetic analysis are shown in FIG. 2. While 3099DOX had essentially no activation with PREP, 3099DOX was activated by FAP with V_max=5.877×10⁻⁹ M/sec, K_m=1.12×10⁻⁵ M, k_cat (V_max/[E])=0.44 sec⁻¹, and k_cat/K_m=39171 M⁻¹ sec⁻¹.

Example 3

Enzyme Kinetics of 3099DOX Activation by FAP

Michaelis-Menten enzyme kinetics for FAP were measured using a SpectraMax M2e microplate reader (Molecular Devices, Sunnyvale, Calif., USA). The assays were performed in FAP buffer (50 mM Tris, 140 mM NaCl, pH 7.5) at 25° C., and the fluorescence continuously monitored at excitation and emission wavelengths of 380 and 460 nm, respectively. Kinetic constants (k_cat and K_m) were determined using GP-AMC (Bachem, Torrance, Calif., USA), Ac-(D)-AP-AFC (MP Biomedicals, Solon, Ohio, USA) and test article concentrations equivalent to 0.1-5 times their respective K_m values, and with 5-10 nM enzyme. All assays were performed in triplicate, and the results were calculated with a nonlinear regression analysis, relying on a Michaelis-Menten curve fit using GraphPad software.

3099DOX at various concentrations ranging from 8.5×10⁻⁶ M to 6.9×10⁻⁴ M was incubated with 1.34×10⁻⁸ M FAP or PREP at 37° C., and released doxorubicin measured. Results of kinetic analysis are shown in FIG. 2. While 3099DOX had essentially no activation with PREP, 3099DOX was activated by FAP with V_max=5.877×10⁻⁹ M/sec, K_m=1.12×10⁻⁵ M, k_cat (V_max/[E])=0.44 sec⁻¹, and k_cat/K_m=39171 M⁻¹ sec⁻¹.

Example 4

Enzyme Kinetics of 3099DOX Activation by FAP

Michaelis-Menten enzyme kinetics for FAP were measured using a SpectraMax M2e microplate reader (Molecular Devices, Sunnyvale, Calif., USA). The assays were performed in FAP buffer (50 mM Tris, 140 mM NaCl, pH 7.5) at 25° C., and the fluorescence continuously monitored at excitation and emission wavelengths of 380 and 460 nm, respectively. Kinetic constants (k_cat and K_m) were determined using GP-AMC (Bachem, Torrance, Calif., USA), Ac-(D)-AP-AFC (MP Biomedicals, Solon, Ohio, USA) and test article concentrations equivalent to 0.1-5 times their respective K_m values, and with 5-10 nM enzyme. All assays were performed in triplicate, and the results were calculated with a nonlinear regression analysis, relying on a Michaelis-Menten curve fit using GraphPad software.

3099DOX at various concentrations ranging from 8.5×10⁻⁶ M to 6.9×10⁻⁴ M was incubated with 1.34×10⁻⁸ M FAP or PREP at 37° C., and released doxorubicin measured. Results of kinetic analysis are shown in FIG. 2. While 3099DOX had essentially no activation with PREP, 3099DOX was activated by FAP with V_max=5.877×10⁻⁹ M/sec, K_m=1.12×10⁻⁵ M, k_cat(V_max/[E])=0.44 sec⁻¹, and k_cat/K_m=39171 M⁻¹ sec⁻¹.