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IOX2 is a potent and selective inhibitor of HIF-1α prolyl hydroxylase-2 (PHD2) with an IC50 of 21 nM for PHD2/ELGN-1 in a cell-free assay, IOX2 has shown >100-fold selectivity over JMJD2A, JMJD2C, JMJD2E, JMJD3, or the 2OG oxygenase FIH [1].

PHDs consist three isoforms, named PHD1, PHD2 and PHD3. PHDs are dioxygenases that utilize oxygen as co-substrate providing the molecular basis for the oxygen-sensing function of these enzymes. It has been reported that PHDs are strikingly sensitive to graded levels of hypoxia, mirroring the progressive increases in HIF-1α protein and DNA binding activity that are observed when cells are exposed to gradual hypoxia [2]. In RCC4 cells, IOX2 inhibited HIF-1α hydroxylation at 50 μM [1].

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