| Assay Method Information | |
| | ACMSD1 Inhibition Assay |
| Description: | The pre-assay mixture consisting of 3-hydroxyanthranilic acid (3OH-HA), 3-hydroxyanthranilic acid, 3,4-diOxygenase (HAO), and a dialyzed crude extract of E. coli BL21 (DE3) cells expressing the recombinant enzyme, was incubated at 25° C. with monitoring of the increase in absorbance at 360 nm due to the formation of ACMS from 3OH-HA. After the reaction was completed within 2 mins, an aliquot of ACMSD1 solution (prepared and purified from Pichia Pastoris overexpressing the recombinant enzyme) was added, and the decrease in absorbance at 360 nm was followed at 15 second intervals. The effect of ACMS concentration on the enzyme activity was investigated by varying 3OH-HA concentration from 2 to 20 μM. Kinetic parameters were calculated from the initial velocity data by using the Lineweaver-Burk plot. The rate of the decrease in absorbance caused by ACMSD1 was calculated by subtracting that of the control reaction mixture without ACMSD from that described above. One unit of ACMSD activity was indicated as the amount of enzyme that converts 1 mmol of ACMS per minute at 25° C. The absence or a reduction of ACMSD1 activity (e.g., by using ACMSD inhibitors) results in a slow ACMS-spontaneous degradation (i.e., cyclization to form quinolic acid). The enzymatic activity was determined at a HAA concentration of 10 μM in the presence of the compounds in Table 1 below. The compounds were tested at the concentration of about 5 μM and 10 μM and the IC50 was calculated for compounds showing inhibitory activity higher than 50%. |
| Affinity data for this assay | |
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