The heterodimeric transcription factor HIF (hypoxia-inducible factor) is central to the regulation of gene expression by oxygen. Three oxygen-dependent prolyl hydroxylase enzymes [PHD1 (prolyl hydroxylase domain 1), PHD2 and PHD3] control the abundance of HIF. In the presence of oxygen, they hydroxylate specific proline residues in HIF-alpha, allowing recognition by pVHL (von Hippel-Lindau protein) and subsequent ubiquitylation and proteasomal destruction. The precise roles and regulation of ...Expand abstract
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Characterization of different isoforms of the HIF prolyl hydroxylase PHD1 generated by alternative initiation.
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