CHEMBL3888399

HIF-PH Assay: Ketoglutaric acid α-[1-14C]-sodium salt, alpha-ketoglutaric acid sodium salt, and HPLC purified peptide were obtained from commercial sources, e.g., Perkin-Elmer (Wellesley Mass.), Sigma-Aldrich, and SynPep Corp. (Dublin Calif.), respectively. Peptides for use in the assay were fragments of HIFα as described above or as disclosed in International Publication WO 2005/118836, incorporated by reference herein. For example, a HIF peptide for use in the HIF-PH assay was [methoxycoumarin]-DLDLEALAPYIPADDDFQL-amide. HIF-PH, e.g., HIF-PH2 (also known as EGLN1 or PHD2), was expressed in, e.g., insect Hi5 cells, and partially purified, e.g., through a SP ion exchange chromatography column. Enzyme activity was determined by capturing 14CO2 using an assay described by Kivirikko and Myllyla (1982, Methods Enzymol. 82:245-304). Assay reactions contained 50 mM HEPES (pH 7.4), 100 μM α-ketoglutaric acid sodium salt, 0.30 μCi/mL α-ketoglutaric acid α-[1-14C]-sodium salt, 40 μM FeSO4, 1 mM ascorbate, 1541.8 units/mL Catalase, with or without 50 μM peptide substrate and various concentrations of compound of the invention. Reactions were initiated by addition of HIF-PH enzyme.