COMMD1 Promotes PVHL and O2-Independent Proteolysis of HIF-1alpha Via HSP90/70

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2009 Oct 6

PMID 19802386

Citations 31

Authors

Bart van de Sluis

Arjan J Groot

Jeroen Vermeulen

Elsken van der Wall

Paul J van Diest

Cisca Wijmenga

Leo W Klomp

Marc Vooijs

Affiliations

Soon will be listed here.

Abstract

Background: The Copper Metabolism MURR1 Domain containing 1 protein COMMD1 has been associated with copper homeostasis, NF-kappaB signaling, and sodium transport. Recently, we identified COMMD1 as a novel protein in HIF-1 signaling. Mouse embryos deficient for Commd1 have increased expression of hypoxia/HIF-regulated genes i.e. VEGF, PGK and Bnip3. Hypoxia-inducible factors (HIFs) are master regulators of oxygen homeostasis, which control angiogenesis, erythropoiesis, glycolysis and cell survival/proliferation under normal and pathologic conditions. Although HIF activity is mainly controlled by ubiquitination and protein degradation by the von Hippel Lindau (pVHL) tumor suppressor gene other mechanisms have recently been identified that regulate HIF signaling independently of pVHL.

Principal Findings: Here we characterized the mechanism by which COMMD1 regulates HIF-1alpha protein degradation. We show that COMMD1 competes with the chaperone heat shock protein HSP90beta for binding to the NH(2)-terminal DNA-binding and heterodimerization domain of HIF-1alpha to regulate HIF-1alpha stability together with HSP70. Inhibition of HSP90 activity with 17-Allylamino-17-demethoxygeldanamycin (17-AAG) increased COMMD1-mediated HIF-1alpha degradation independent of ubiquitin and pVHL.

Conclusion/significance: These data reveal a novel role for COMMD1 in conjunction with HSP90beta/HSP70 in the ubiquitin and O(2)-independent regulation of HIF-1alpha.

Citing Articles

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