Inhibition of PHD1 (unknown origin) expressed in Sf9 cells using HIF-1alpha peptide as substrate preincubated for 30 mins followed by substrate addition measured after 2 hrs by HTRF assay in presence of 2-oxoglutarate
Inhibition Assay: Hydroxylated HIF bonds specifically to the von Hippel-Lindau protein-elongin B-elongin C complex (VBC complex). This interaction occurs only if HIF is hydroxylated on a conserved prolyl radical. It is the basis for the biochemical determination of HIF prolyl hydroxylase activity. The test is carried out as described [Oehme F., Jonghaus W., Narouz-Ott L., Huetter J., Flamme I., Anal. Biochem. 330 (1), 74-80 (2004)].
HIF-PH Assay: Ketoglutaric acid α-[1-14C]-sodium salt, alpha-ketoglutaric acid sodium salt, and HPLC purified peptide may be obtained from commercial sources, e.g., Perkin-Elmer (Wellesley Mass.), Sigma-Aldrich, and SynPep Corp. (Dublin Calif.), respectively. Peptides for use in the assay may be fragments of HIFα as described above or as disclosed in International Publication WO 2005/118836, incorporated by reference herein. HIF-pH, e.g., PHD1 (EGLN2) or PHD2 (EGLN1), can be expressed in, e.g., insect Hi5 cells, and partially purified, e.g., through a SP ion exchange chromatography column. Enzyme activity is determined by capturing 14CO2 using an assay described by Kivirikko and Myllyla (1982, Methods Enzymol. 82:245-304). Assay reactions contain 50 mM HEPES (pH 7.4), 100 μM α-ketoglutaric acid sodium salt, 0.30 mCi/mL 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 are initiated by addition of HIF-PH enzyme.
Inhibition of full length HIF-PHD1 (unknown origin) expressed in baculovirus infected sf9 cells using DLDLEMLAPYIPMDDDFQL/2-Oxoglutarate as substrate preincubated for 15 mins followed by substrate addition measured after 30 mins by UPLC-MS analysis
Inhibition of FLAG- tagged full length HIF-PHD1 (unknown origin) expressed in baculovirus-infected Sf9 cells using biotin labelled DLDLEMLAPYIPMDDDFQL as substrate preincubated for 30 mins followed by substrate addition measured after 2 hrs by LANCE assay
Inhibition of recombinant human HIF-PHD1 expressed in baculovirus-infected Sf9 cells using biotin labelled DLDLEMLAPYIPMDDDFQL as substrate preincubated for 60 mins followed by substrate addition measured after 60 mins by TR-FRET assay
Inhibition of recombinant human HIF-PHD1 expressed in baculovirus-infected Sf9 cells using biotin labelled DLDLEMLAPYIPMDDDFQL and 2-oxoglutarate as substrates preincubated for 30 mins followed by substrates addition and measured after 2 hrs by TR-FRET assay
Inhibition of FLAG-tagged full-length HIF-PHD1 (unknown origin) expressed in baculovirus infected Sf9 cells using 2-oxoglutarate and HIF1alpha biotinyl-DLDLEMLAPYIPMDDDFQL as peptide substrates preincubated for 30 mins followed by substrate addition and measured after 2 hrs by LANCE assay
Inhibition of recombinant full length human N-terminal FLAG-tagged PHD1 expressed in baculovirus expression system using HIF1/C35 complex as substrate preincubated for 30 mins followed by substrate addition measured after 10 mins by TR-FRET assay