Journal
MOLECULAR AND CELLULAR BIOLOGY
Volume 22, Issue 9, Pages 2984-2992Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/MCB.22.9.2984-2992.2002
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Funding
- NCI NIH HHS [R01CA89212-02, R01 CA089212] Funding Source: Medline
- NHLBI NIH HHS [T32 HL007821, T32HL007821] Funding Source: Medline
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Hypoxia-inducible factor 1 complex (HIF-1) plays a pivotal role in oxygen homeostasis and adaptation to hypoxia. Its function is controlled by both the protein stability and the transactivation activity of its alpha subunit, HIF-1alpha. Hydroxylation of at least two prolyl residues in the oxygen-dependent degradation domain of HIF-1alpha regulates its interaction with the von Hippel-Lindau protein (VHL) that targets HIF-1alpha for ubiquitination and proteasomal degradation. Several prolyl hydroxylases have been found to specifically hydroxylate HIF-1alpha. In this report, we investigated possible roles of VHL and hydroxylases in the regulation of the transactivation activity of the C-terminal activating domain (CAD) of HIF-1alpha. We demonstrate that regulation of the transactivation activity of HIF-1alpha CAD also involves hydroxylase activity but does not require functional VHL. In addition, stimulation of the CAD activity by a hydoxylase inhibitor, hypoxia, and desferrioxamine was severely blocked by the adenoviral oncoprotein E1A but not by an E1A mutant defective in targeting p300/CBP. We further demonstrate that a hydroxylase inhibitor, hypoxia, and desferrioxamine promote the functional and physical interaction between HIF-1alpha CAD and p300/CBP in vivo. Taken together, our data provide evidence that hypoxia-regulated stabilization and transcriptional stimulation of HIF-1alpha function are regulated through partially overlapping but distinguishable pathways.
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