- Blagg, J Sepiapterin reductase inhibitors for the treatment of pain US Patent US9169234 (2015)
- Gao, H; Schneider, S; Andrews, P; Wang, K; Huang, X; Sparling, BA Virtual screening to identify potent sepiapterin reductase inhibitors. Bioorg Med Chem Lett 30: (2020)
- Alen, J; Schade, M; Wagener, M; Christian, F; Nordhoff, S; Merla, B; Dunkern, TR; Bahrenberg, G; Ratcliffe, P Fragment-Based Discovery of Novel Potent Sepiapterin Reductase Inhibitors. J Med Chem 62: 6391-6397 (2019)
- ChEMBL_1970294 (CHEMBL4603112) Inhibition of sepiapterin reductase (unknown origin)
- ChEMBL_1860102 (CHEMBL4360958) Inhibition of human sepiapterin reductase using L-sepiapterin as substrate preincubated for 15 mins followed by substrate addition
- ChEMBL_1860096 (CHEMBL4360952) Inhibition of TNAS binding to human sepiapterin reductase by 19F-NMR spectra analysis
- Measurement of Human SPR Inhibitory Activity Assay Human SPR inhibitory activity was measured by using a 384-well low adsorption clear plate (Greiner) with buffer D containing 100 mM Tris-HCl (pH 7.5) (Thermo Fisher Scientific) and 0.01% bovine serum albumin (Sigma). A compound was diluted with DMSO to a concentration of 1 mM, and a 1 μL aliquot of the preparation was diluted with 250 μL of buffer D. The thus-diluted compound was dispensed into the 384-well plate at L/well. Thereafter, human SPR was diluted with buffer D to 200 ng/mL and then dispensed into the 384-well plate at 20 μL/well. Subsequently, 40 μL of ultrapure water containing 120 μM Sepiapterin (WuXi AppTec) and 120 μM NADPH (Nacalai) was added to each well, and mixed with a vortex mixer, to thereby initiate the reaction. The reaction mixture was incubated at room temperature for 240 minutes, and the reaction was terminated by addition of 10 μL of ultrapure water containing 2% formic acid (Nacalai). In order to determine the amount of sepiapterin after termination of the reaction, the absorbance at 420 nm was measured by applying the 384-well plate to EnSpire multimode plate reader (Perkin Elmer).
- Chromogenic assay To screen for SPR inhibition, a biochemical assay based on LC/MS (and chromogenic) read-out has been developed. The LC/MS assay monitors the product formation (L-biopterin) and the chromogenic assay measures OD at 420 nm.N-methoxyacetyl serotonin was used as a reference compound (positive control). The IC50 measured using the screening conditions was 20-40 nM, which agrees with the literature (Smith et al., Journal of Biological Chemistry, 297:5601, 1992). The exemplary assay protocol uses the following conditions: SPR (6 nM); L-Sepiapterin (50 uM); NADPH (100 uM); Na-Phosphate buffer, pH 6.5 (100 mM); 82 uL assay volume; 60 minutes incubation with compounds (0.5% final concentration in DMSO) at 37° C. in Greiner uClear 384 well plates.The following experimental procedure was applied: (1) Add 2 uL compound (inhibitor) dilutions (20% DMSO) in Greiner uClear 384 well plates. (2) Add 40 uL enzyme/assay buffer.
- LC/MS assay To screen for SPR inhibition, a biochemical assay based on LC/MS (and chromogenic) read-out has been developed. The LC/MS assay monitors the product formation (L-biopterin) and the chromogenic assay measures OD at 420 nm.N-methoxyacetyl serotonin was used as a reference compound (positive control). The IC50 measured using the screening conditions was 20-40 nM, which agrees with the literature (Smith et al., Journal of Biological Chemistry, 297:5601, 1992).The exemplary assay protocol uses the following conditions: SPR (6 nM); L-Sepiapterin (50 uM); NADPH (100 uM); Na-Phosphate buffer, pH 6.5 (100 mM); 82 uL assay volume; 60 minutes incubation with compounds (0.5% final concentration in DMSO) at 37° C. in Greiner uClear 384 well plates.The following experimental procedure was applied: (1) Add 2 uL compound (inhibitor) dilutions (20% DMSO) in Greiner uClear 384 well plates. (2) Add 40 uL enzyme/assay buffer.