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. 2015 Jan 15;5:798. doi: 10.3389/fmicb.2014.00798

FIGURE 1.

FIGURE 1

2-oxoglutarate oxygenase catalyzed hydroxylation and their biochemical effects. (A) Hydroxylation of proline residues of collagen by procollagen prolyl 4-hydroxylation (P4H) and prolyl 3-hydroxylase (P3H) increase the structural stability of collagen. (B) Hydroxylation of collagen lysine residues by procollagen lysine 5-hydroxylase (PLOD) provides further stability through creating cross-linking sites. (C) Hydroxylation of HIF proline residues by prolyl hydroxylase domain (PHD) enzymes stabilizes the interaction between HIF and von Hippel Lindau (VHL) protein targeting HIF for degradation, while asparaginyl hydroxylation of HIF by factor inhibiting HIF (FIH) acts to inhibit transcriptional activity by disrupting the interaction of HIF with p300. Both hydroxylation events result in suppression of the hypoxic response. (D) Lysyl hydroxylation of a variety of proteins by hydroxylase Jmjd6 has effects on alternative splicing (U2AF65), epigenetic regulation (histones H2A/H2B and H3/H4), and p53 tumor suppressor activity.