HIF1α protein stability is increased by acetylation at lysine 709.

Lysine acetylation regulates protein stability and function. p300 is a component of the HIF-1 transcriptional complex and positively regulates the transactivation of HIF-1. Here, we show a novel molecular mechanism by which p300 facilitates HIF-1 activity. p300 increases HIF-1α (HIF1α) protein acetylation and stability. The regulation can be opposed by ...
HDAC1, but not by HDAC3, and is abrogated by disrupting HIF1α-p300 interaction. Mechanistically, p300 specifically acetylates HIF1α at Lys-709, which increases the protein stability and decreases polyubiquitination in both normoxia and hypoxia. Compared with the wild-type protein, a HIF1α K709A mutant protein is more stable, less polyubiquitinated, and less dependent on p300. Overexpression of the HIF1α wild-type or K709A mutant in cancer cells lacking the endogenous HIF1α shows that the K709A mutant is transcriptionally more active toward the HIF-1 reporter and some endogenous target genes. Cancer cells containing the K709A mutant are less sensitive to hypoxia-induced growth arrest than the cells containing the HIF1α wild-type. Taken together, these data demonstrate a novel biological consequence upon HIF1α-p300 interaction, in which HIF1α can be stabilized by p300 via Lys-709 acetylation.
Mesh Terms:
Acetylation, Amino Acid Substitution, Cell Cycle Checkpoints, Cell Hypoxia, Cell Line, Tumor, HEK293 Cells, Histone Deacetylase 1, Histone Deacetylases, Humans, Hypoxia-Inducible Factor 1, alpha Subunit, Lysine, Mutation, Missense, Protein Stability, p300-CBP Transcription Factors
J. Biol. Chem.
Date: Oct. 12, 2012
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