Hypoxia inducible transcription factors (HIFs) mediate the hypoxic response in metazoans. When sufficient O is present, Fe(II)/2-oxoglutarate (2OG)-dependent oxygenases (human PHD1-3) promote HIFα degradation via prolyl-hydroxylation. We report crystallographic, spectroscopic, and biochemical characterization of stable and inactive PHD2.
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