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Related Experiment Videos

Proline hydroxylation and gene expression.

William G Kaelin1

  • 1Howard Hughes Medical Institute, Dana-Farber Cancer Institute, Brigham and Women's Hospital, and Harvard Medical School, Boston, Massachusetts 02115, USA. william_kaelin@dfci.harvard.edu

Annual Review of Biochemistry
|June 15, 2005
PubMed
Summary

Hypoxia-inducible factor (HIF) is regulated by oxygen levels through hydroxylation, a process crucial for cellular oxygen sensing. This mechanism involves HIFalpha subunit modification, leading to its degradation or altered activity.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cellular Signaling

Background:

  • Hypoxia-inducible factor (HIF) regulates genes in response to low oxygen.
  • HIF comprises a labile alpha subunit and a stable beta subunit.
  • Oxygen levels control HIF stability and activity.

Purpose of the Study:

  • To elucidate the mechanistic insights into oxygen sensing by metazoans.
  • To identify the role of protein hydroxylation in intracellular signaling.
  • To explore the regulation of HIFalpha subunits.

Main Methods:

  • Investigated hydroxylation of HIFalpha subunits by EGLN family members.
  • Examined the interaction between prolyl hydroxylation and the VHL tumor suppressor protein.
  • Analyzed the effect of asparagine hydroxylation by FIH on HIFalpha activity.

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Main Results:

  • Prolyl hydroxylation of HIFalpha by EGLNs creates a VHL binding site, targeting HIFalpha for degradation.
  • Asparagine hydroxylation by FIH modulates HIFalpha's transcriptional activation function.
  • Protein hydroxylation is identified as a key mechanism in intracellular oxygen signaling.

Conclusions:

  • HIF regulation via hydroxylation provides novel insights into oxygen sensing.
  • This hydroxylation-dependent pathway is a critical component of cellular response to hypoxia.
  • The discovery suggests potential roles for other hydroxylases in cellular signaling.